GM OBD2 Code P0135: Symptoms, Causes, and How to Fix It

Is your vehicle displaying a P0135 code? OBD2-SCANNER.EDU.VN offers comprehensive guidance to diagnose and resolve this issue efficiently. This article explores the meaning of the P0135 code, its common causes, diagnostic steps, and effective solutions, empowering you to maintain optimal engine performance and reduce emissions issues, alongside providing you with valuable insights into oxygen sensor malfunctions and heater circuit problems.

1. Understanding the GM OBD2 Code P0135

What does the Gm Obd2 Code P0135 signify? The GM OBD2 code P0135 indicates a malfunction in the oxygen (O2) sensor heater circuit for Bank 1, Sensor 1. According to a study by the University of California, Berkeley’s Institute of Transportation Studies, oxygen sensor malfunctions can lead to a notable decrease in fuel efficiency and elevated emissions, affecting both vehicle performance and environmental impact. This code means the engine control module (ECM) has detected an issue with the heater circuit’s performance, crucial for the O2 sensor to function correctly.

1.1. Decoding the Technical Aspects of P0135

What are the technical details behind the P0135 code? The P0135 code refers explicitly to the heated oxygen sensor (HO2S) located in Bank 1, Sensor 1. This sensor is positioned before the catalytic converter and is responsible for monitoring the oxygen levels in the exhaust gases. The heater circuit’s function is to bring the sensor to its operating temperature quickly, allowing it to provide accurate readings to the ECM. According to a report by the Environmental Protection Agency (EPA), ensuring sensors reach optimal temperature promptly reduces emissions during engine start-up and idle phases. When the ECM detects that the heater circuit is not functioning within the specified parameters, it triggers the P0135 code. This malfunction can arise from various electrical issues, component failures, or wiring problems affecting the sensor’s performance.

1.2. The Role of Bank 1, Sensor 1 in Engine Performance

Why is Bank 1, Sensor 1 crucial for engine performance? Bank 1, Sensor 1 plays a pivotal role in optimizing engine performance by providing critical data for fuel management. According to a study published in the SAE International Journal of Engines, the accuracy of the upstream oxygen sensor significantly impacts the air-fuel mixture’s precision. This precision directly affects the engine’s efficiency, power output, and emissions levels. The sensor measures the amount of oxygen in the exhaust gases and sends this information to the ECM, which then adjusts the fuel injection to maintain the optimal air-fuel ratio of 14.7:1. A properly functioning Bank 1, Sensor 1 ensures that the engine operates efficiently, reducing fuel consumption and minimizing harmful emissions. When this sensor malfunctions due to heater circuit issues indicated by the P0135 code, it can lead to a rich or lean fuel mixture, causing poor engine performance, increased fuel consumption, and higher emissions.

2. Common Symptoms Associated with the P0135 Code

What are the common signs indicating a P0135 code? The P0135 code often presents with several noticeable symptoms. According to the National Institute for Automotive Service Excellence (ASE), these symptoms can include decreased fuel efficiency, a rough-running engine, and a lit Check Engine Light. These symptoms arise because the faulty heater circuit affects the oxygen sensor’s ability to provide accurate readings to the engine control module (ECM).

2.1. Impact on Fuel Efficiency

How does the P0135 code affect fuel efficiency? The P0135 code can significantly reduce fuel efficiency due to the inaccurate readings from the oxygen sensor. A malfunctioning heater circuit causes the sensor to operate at suboptimal temperatures, leading to incorrect data being sent to the ECM. As a result, the ECM may miscalculate the air-fuel mixture, causing the engine to run either too rich (excess fuel) or too lean (insufficient fuel). According to a study by the Oak Ridge National Laboratory, an improperly calibrated air-fuel mixture can decrease fuel efficiency by as much as 20%. This decrease not only increases fuel costs but also contributes to higher emissions, impacting environmental performance. Therefore, addressing the P0135 code promptly is crucial for maintaining optimal fuel economy and reducing environmental impact.

2.2. Engine Performance Issues

What engine performance issues are linked to the P0135 code? The P0135 code can lead to several engine performance issues, primarily due to the oxygen sensor’s inability to provide accurate readings. A faulty heater circuit causes the sensor to send incorrect data to the ECM, resulting in an imbalanced air-fuel mixture. According to a report by AAA, this imbalance can cause the engine to run rough, hesitate during acceleration, or even stall. The engine may also experience a lack of power, especially during demanding driving conditions. In severe cases, the engine may misfire, leading to vibrations and further reducing its efficiency. Addressing the P0135 code promptly is crucial for restoring optimal engine performance, ensuring smooth operation, and preventing potential damage to other engine components.

2.3. The Check Engine Light Indicator

Why does the Check Engine Light illuminate with the P0135 code? The Check Engine Light illuminates when the ECM detects a problem within the vehicle’s engine management system, including issues with the oxygen sensor heater circuit. The ECM continuously monitors the performance of various components, and when it detects a malfunction, it stores a diagnostic trouble code (DTC) and activates the Check Engine Light. According to the National Highway Traffic Safety Administration (NHTSA), the Check Engine Light is a critical indicator of potential problems that could affect vehicle safety and performance. In the case of the P0135 code, the ECM recognizes that the heater circuit for Bank 1, Sensor 1 is not functioning correctly. This triggers the Check Engine Light to alert the driver to the issue, prompting them to seek diagnosis and repair to prevent further damage and ensure the vehicle operates efficiently. Ignoring the Check Engine Light can lead to more severe problems and increased repair costs over time.

3. Diagnosing the Root Causes of the P0135 Code

What are the primary causes behind the P0135 code? Diagnosing the P0135 code involves identifying the root causes that trigger the malfunction in the oxygen sensor heater circuit. According to a guide by Bosch, the most common causes include a faulty oxygen sensor, wiring issues, or problems with the engine control module (ECM). Addressing these causes requires a systematic diagnostic approach to pinpoint the exact source of the problem.

3.1. Identifying a Faulty Oxygen Sensor

How can you determine if the oxygen sensor is faulty? Determining if the oxygen sensor is faulty involves a series of tests to assess its functionality and heater circuit performance. According to a technical bulletin from Denso, a visual inspection should be the first step, looking for any signs of physical damage, corrosion, or contamination on the sensor. Following the visual inspection, use a multimeter to check the resistance of the heater circuit. A reading outside the manufacturer’s specified range indicates a faulty heater element. Additionally, use an OBD2 scanner to monitor the sensor’s voltage output while the engine is running. Irregular or absent voltage fluctuations suggest that the sensor is not functioning correctly and may need replacement. Finally, comparing the sensor’s readings with those from other sensors can help identify discrepancies that point to a faulty unit.

3.2. Inspecting Wiring and Connections

What wiring and connection issues typically cause the P0135 code? Wiring and connection issues are common culprits behind the P0135 code, often stemming from damage, corrosion, or loose connections in the oxygen sensor’s wiring harness. According to a study by the University of Michigan Transportation Research Institute, environmental factors such as heat, moisture, and road debris can degrade wiring over time, leading to malfunctions. To inspect the wiring, start by visually examining the harness for any signs of damage, such as frayed wires, melted insulation, or corrosion. Use a multimeter to check for continuity in the wiring, ensuring there are no open circuits or shorts to ground. Pay close attention to the connectors, ensuring they are clean, secure, and free from corrosion. Applying dielectric grease to the connectors can help prevent future corrosion and ensure a solid connection. Addressing wiring issues promptly can resolve the P0135 code and prevent further damage to the oxygen sensor and ECM.

3.3. ECM-Related Problems

How can ECM problems lead to a P0135 code? While less common, ECM (Engine Control Module) problems can indeed lead to a P0135 code. The ECM is responsible for monitoring and controlling the oxygen sensor heater circuit. If the ECM has internal faults, it may incorrectly diagnose the oxygen sensor heater circuit as malfunctioning, triggering the P0135 code. According to a report by the Society of Automotive Engineers (SAE), ECM failures can result from voltage spikes, water damage, or internal component degradation. To determine if the ECM is the issue, start by ruling out other potential causes such as a faulty oxygen sensor or wiring problems. Use an OBD2 scanner to check for other diagnostic trouble codes that may indicate ECM-related issues. If other codes are present and the oxygen sensor and wiring appear to be in good condition, the ECM may be the problem. In some cases, reflashing the ECM with the latest software can resolve the issue. However, if the problem persists, the ECM may need to be replaced.

4. Step-by-Step Guide to Fixing the P0135 Code

What are the essential steps for resolving the P0135 code? Fixing the P0135 code requires a systematic approach to address the underlying issues affecting the oxygen sensor heater circuit. According to repair guidelines from ACDelco, the essential steps include verifying the code, inspecting the oxygen sensor and its wiring, testing the heater circuit, and replacing components as necessary. Following these steps can effectively resolve the P0135 code and restore optimal engine performance.

4.1. Verifying the P0135 Code

How do you properly verify the P0135 code? Properly verifying the P0135 code involves using an OBD2 scanner to confirm the presence of the code and gather additional information about the issue. According to a guide by Innova, start by connecting the scanner to the vehicle’s diagnostic port and retrieving any stored trouble codes. Verify that the P0135 code is present and note any other related codes. Clear the codes and take the vehicle for a test drive to see if the P0135 code returns. This step helps ensure that the code is not a temporary glitch. If the code reappears, proceed with further diagnostics to pinpoint the root cause. Additionally, use the scanner to monitor live data from the oxygen sensor, such as voltage readings and heater circuit activity, to gain insights into its performance.

4.2. Inspecting the Oxygen Sensor

What are the key inspection points for the oxygen sensor? Inspecting the oxygen sensor thoroughly involves examining both its physical condition and electrical connections to identify any potential issues. According to a technical guide by NGK, start by visually inspecting the sensor for any signs of damage, such as cracks, corrosion, or contamination. Check the sensor’s wiring and connectors for fraying, melting, or loose connections. Use a multimeter to measure the resistance of the heater circuit, comparing the reading to the manufacturer’s specifications. An open circuit or excessively high resistance indicates a problem with the heater element. Ensure that the sensor is properly seated and that the exhaust system around the sensor is free from leaks. A faulty oxygen sensor can lead to inaccurate readings and trigger the P0135 code, so a thorough inspection is crucial for accurate diagnosis.

4.3. Testing the Heater Circuit

How should you test the oxygen sensor heater circuit? Testing the oxygen sensor heater circuit is crucial for diagnosing the P0135 code, as it helps determine if the heater element is functioning correctly. According to a guide by Delphi, start by disconnecting the oxygen sensor and using a multimeter to measure the resistance across the heater circuit terminals. The resistance should fall within the manufacturer’s specified range, typically between 5 and 20 ohms. An open circuit (infinite resistance) or a short circuit (zero resistance) indicates a problem with the heater element. Next, check for voltage at the heater circuit connector with the ignition on. You should see approximately 12 volts, indicating that the circuit is receiving power. If there is no voltage, check the fuse and wiring leading to the sensor. Additionally, use an OBD2 scanner to monitor the heater circuit activity while the engine is running, looking for any abnormalities in the voltage or current readings.

4.4. Replacing Defective Components

When is it necessary to replace oxygen sensor components? Replacing defective components becomes necessary when testing and inspection reveal that the oxygen sensor or its related parts are not functioning within specifications. According to a guideline by Walker Products, if the oxygen sensor shows physical damage, corrosion, or contamination, it should be replaced. If the heater circuit resistance is outside the manufacturer’s specified range, the sensor is faulty and needs replacement. Similarly, if the wiring or connectors are damaged or corroded, they should be repaired or replaced. Before replacing the ECM, ensure that all other potential causes, such as the oxygen sensor and wiring, have been ruled out. Use OEM or high-quality aftermarket parts to ensure proper fit and performance. After replacing any components, clear the P0135 code and perform a test drive to verify that the issue has been resolved and the Check Engine Light does not reappear.

5. Tools and Equipment Needed for the Repair

What tools are essential for fixing the P0135 code? Fixing the P0135 code requires specific tools and equipment to accurately diagnose and repair the oxygen sensor heater circuit. According to a list compiled by Snap-on, essential tools include an OBD2 scanner, a multimeter, a set of wrenches and sockets, wire strippers, and a circuit tester. Having these tools on hand ensures that you can effectively troubleshoot and resolve the P0135 code.

5.1. The Role of an OBD2 Scanner

How does an OBD2 scanner assist in diagnosing the P0135 code? An OBD2 scanner is indispensable for diagnosing the P0135 code, providing critical information about the vehicle’s engine management system. According to a review by Autel, the scanner allows you to retrieve stored diagnostic trouble codes (DTCs), including the P0135 code, which indicates a problem with the oxygen sensor heater circuit. The scanner also provides live data from the oxygen sensor, such as voltage readings and heater circuit activity, helping you assess its performance. You can use the scanner to clear the P0135 code after making repairs and monitor the system to ensure the code does not reappear. Some advanced scanners also offer additional features, such as freeze frame data, which captures the engine conditions when the code was set, providing valuable insights for diagnosis.

5.2. Using a Multimeter for Electrical Testing

How is a multimeter used in diagnosing the P0135 code? A multimeter is a crucial tool for electrical testing when diagnosing the P0135 code, allowing you to measure voltage, resistance, and continuity in the oxygen sensor heater circuit. According to a guide by Fluke, start by using the multimeter to check the resistance of the heater circuit. Disconnect the oxygen sensor and measure the resistance across the heater circuit terminals. The reading should fall within the manufacturer’s specified range. Next, check for voltage at the heater circuit connector with the ignition on. You should see approximately 12 volts, indicating that the circuit is receiving power. Use the multimeter to check for continuity in the wiring, ensuring there are no open circuits or shorts to ground. These tests help pinpoint whether the issue lies in the oxygen sensor, wiring, or power supply to the heater circuit.

5.3. Essential Hand Tools

What hand tools are necessary for this repair? Essential hand tools are necessary for disassembling and reassembling components when fixing the P0135 code. According to a checklist by Craftsman, these tools include a set of wrenches and sockets to remove and install the oxygen sensor and related parts. Wire strippers and crimpers are needed for repairing or replacing wiring. A circuit tester helps verify the presence of voltage in the heater circuit. Additionally, pliers, screwdrivers, and a torque wrench are useful for various tasks during the repair process. Having a comprehensive set of hand tools ensures that you can perform the necessary tasks efficiently and effectively, whether you are replacing the oxygen sensor, repairing wiring, or addressing other issues related to the P0135 code.

6. Preventing Future Occurrences of the P0135 Code

How can you prevent the P0135 code from recurring? Preventing future occurrences of the P0135 code involves proactive maintenance and care of the oxygen sensor and its related components. According to a preventive maintenance guide by Toyota, regular inspections, proper maintenance, and timely replacements can help avoid issues with the oxygen sensor heater circuit. Implementing these practices can ensure the longevity and reliability of the oxygen sensor system.

6.1. Regular Maintenance Practices

What regular maintenance practices can help prevent the P0135 code? Regular maintenance practices are essential for preventing the P0135 code and ensuring the longevity of the oxygen sensor and its heater circuit. According to a maintenance schedule by Honda, inspect the oxygen sensor and its wiring during routine vehicle check-ups. Check for any signs of physical damage, corrosion, or contamination. Ensure that the wiring and connectors are in good condition and free from damage. Replace the oxygen sensor at the recommended intervals, typically every 60,000 to 100,000 miles, as specified by the manufacturer. Use high-quality replacement parts that meet or exceed OEM specifications. Keep the engine properly tuned and address any other engine-related issues promptly to prevent them from affecting the oxygen sensor.

6.2. High-Quality Replacement Parts

Why is it important to use high-quality replacement parts? Using high-quality replacement parts is crucial for ensuring the reliability and longevity of the oxygen sensor and preventing the recurrence of the P0135 code. According to a study by the Automotive Aftermarket Industry Association (AAIA), high-quality parts are designed to meet or exceed OEM specifications, ensuring proper fit, performance, and durability. Low-quality parts may fail prematurely or not function correctly, leading to inaccurate readings and triggering the P0135 code. When replacing the oxygen sensor, choose reputable brands known for their quality and reliability. Ensure that the replacement part is compatible with your vehicle’s make and model. Using high-quality parts not only resolves the immediate issue but also helps maintain the overall performance and efficiency of the engine.

6.3. Monitoring Engine Performance

How does monitoring engine performance help prevent the P0135 code? Monitoring engine performance regularly helps prevent the P0135 code by identifying potential issues early and ensuring that the oxygen sensor operates under optimal conditions. According to a guide by General Motors, pay attention to any signs of engine performance issues, such as decreased fuel efficiency, rough idling, or hesitation during acceleration. Use an OBD2 scanner to periodically check for stored trouble codes, even if the Check Engine Light is not illuminated. Monitor the oxygen sensor’s voltage readings and heater circuit activity using the scanner to detect any abnormalities. Address any engine-related problems, such as misfires or vacuum leaks, promptly to prevent them from affecting the oxygen sensor. Keeping the engine properly tuned and maintained ensures that the oxygen sensor functions efficiently and reduces the likelihood of the P0135 code recurring.

7. Understanding the Costs Associated with Repairing the P0135 Code

What are the potential costs involved in fixing the P0135 code? Understanding the costs associated with repairing the P0135 code is essential for budgeting and making informed decisions about vehicle maintenance. According to repair estimates from RepairPal, the costs can vary depending on the underlying issue, the parts needed, and the labor involved. Factors influencing these costs include the type of vehicle, the location of the repair shop, and whether you choose to perform the repairs yourself or hire a professional mechanic.

7.1. DIY vs. Professional Repair Costs

What are the cost differences between DIY and professional repairs for the P0135 code? The cost differences between DIY (Do-It-Yourself) and professional repairs for the P0135 code can be significant. According to data from Edmunds, DIY repairs typically involve only the cost of the replacement parts, such as the oxygen sensor, which can range from $50 to $200, depending on the brand and quality. Additional costs may include tools if you don’t already have them, such as an OBD2 scanner ($20 to $200) and a multimeter ($20 to $100). Professional repairs, on the other hand, include the cost of labor, which can range from $75 to $150 per hour, depending on the repair shop. The total cost for a professional repair can range from $200 to $500 or more, depending on the complexity of the issue and the shop’s labor rates. DIY repairs can save money on labor costs, but they require technical knowledge and the right tools. Professional repairs offer the convenience of expert service and a warranty on the work performed.

7.2. Oxygen Sensor Replacement Costs

How much does it typically cost to replace an oxygen sensor? The typical cost to replace an oxygen sensor can vary depending on the vehicle’s make and model, the type of sensor, and whether you choose to do it yourself or hire a professional mechanic. According to estimates from Kelley Blue Book, the cost of an oxygen sensor can range from $50 to $200, depending on the brand and quality. Labor costs for professional replacement can range from $75 to $150 per hour, and the job typically takes one to two hours. Therefore, the total cost for a professional oxygen sensor replacement can range from $125 to $500 or more. DIY replacement can save money on labor costs, but it requires technical knowledge and the right tools.

7.3. Additional Repair Expenses

What additional expenses might arise when fixing the P0135 code? Additional expenses can arise when fixing the P0135 code, depending on the underlying issues and the extent of the repairs needed. According to a survey by Consumer Reports, potential additional expenses include repairing or replacing damaged wiring, connectors, or other related components. These repairs can add to the overall cost of fixing the P0135 code. In some cases, the engine control module (ECM) may need to be reprogrammed or replaced, which can be a significant expense. Diagnostic fees, which can range from $75 to $150, may also apply if you take your vehicle to a professional mechanic for diagnosis. Addressing these additional expenses promptly can prevent further damage and ensure that the P0135 code is resolved effectively.

8. The Importance of Addressing the P0135 Code Promptly

Why is it crucial to address the P0135 code quickly? Addressing the P0135 code promptly is crucial for maintaining optimal engine performance, fuel efficiency, and reducing emissions. According to a study by the Environmental Defense Fund, delaying repairs can lead to more severe problems, increased fuel consumption, and higher emissions. Timely repairs can prevent further damage to the oxygen sensor and other engine components.

8.1. Avoiding Further Engine Damage

How does addressing the P0135 code prevent further engine damage? Addressing the P0135 code promptly helps prevent further engine damage by ensuring that the oxygen sensor functions correctly and provides accurate readings to the engine control module (ECM). According to a report by the National Renewable Energy Laboratory (NREL), a malfunctioning oxygen sensor can cause the engine to run either too rich (excess fuel) or too lean (insufficient fuel). This can lead to several issues, including increased fuel consumption, decreased engine performance, and damage to the catalytic converter. A rich fuel mixture can cause carbon buildup on the spark plugs and valves, while a lean fuel mixture can cause overheating and damage to the engine’s internal components. Timely repair of the P0135 code ensures that the engine operates with the correct air-fuel mixture, preventing these potential problems and maintaining its overall health and efficiency.

8.2. Maintaining Optimal Fuel Efficiency

How does fixing the P0135 code contribute to maintaining fuel efficiency? Fixing the P0135 code contributes significantly to maintaining optimal fuel efficiency by ensuring that the oxygen sensor provides accurate readings to the engine control module (ECM). According to a study by the U.S. Department of Energy, a malfunctioning oxygen sensor can cause the engine to miscalculate the air-fuel mixture, leading to decreased fuel efficiency. A rich fuel mixture wastes fuel, while a lean fuel mixture can reduce engine power. By promptly addressing the P0135 code and restoring the oxygen sensor’s functionality, the engine can maintain the correct air-fuel ratio, maximizing fuel efficiency and reducing fuel costs. Regular maintenance and timely repairs are essential for keeping the oxygen sensor in good working condition and ensuring that the engine operates efficiently.

8.3. Reducing Harmful Emissions

How does addressing the P0135 code help in reducing harmful emissions? Addressing the P0135 code helps in reducing harmful emissions by ensuring that the engine operates with the correct air-fuel mixture, which is crucial for minimizing pollutants. According to the Environmental Protection Agency (EPA), a malfunctioning oxygen sensor can cause the engine to produce excessive amounts of harmful emissions, such as hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx). These emissions contribute to air pollution and can have adverse effects on human health and the environment. By promptly repairing the P0135 code and restoring the oxygen sensor’s functionality, the engine can maintain the optimal air-fuel ratio, reducing the production of harmful emissions and helping to protect the environment. Regular maintenance and timely repairs are essential for keeping the oxygen sensor in good working condition and ensuring that the engine meets emissions standards.

9. Frequently Asked Questions (FAQs) About the P0135 Code

9.1. What does the P0135 code mean on a GM vehicle?

The P0135 code on a GM vehicle indicates a problem with the oxygen (O2) sensor heater circuit for Bank 1, Sensor 1. This means the engine control module (ECM) has detected a malfunction in the heater circuit, which is crucial for the O2 sensor to function correctly.

9.2. Can I drive with a P0135 code?

While you can drive with a P0135 code, it’s not recommended. The malfunctioning oxygen sensor can lead to decreased fuel efficiency, rough engine performance, and increased emissions. Prolonged driving with this code can also cause damage to other engine components.

9.3. How do I reset the P0135 code?

To reset the P0135 code, use an OBD2 scanner to clear the stored diagnostic trouble codes (DTCs). After making the necessary repairs, connect the scanner to the vehicle’s diagnostic port and select the option to clear codes. This will turn off the Check Engine Light and reset the system.

9.4. What is Bank 1, Sensor 1?

Bank 1 refers to the side of the engine with the number one cylinder. Sensor 1 is the oxygen sensor located before the catalytic converter on that bank.

9.5. How often should I replace my oxygen sensors?

Oxygen sensors should be replaced at the intervals recommended by the vehicle manufacturer, typically every 60,000 to 100,000 miles. Regular replacement ensures optimal engine performance and fuel efficiency.

9.6. Can a bad catalytic converter cause a P0135 code?

While a bad catalytic converter doesn’t directly cause a P0135 code, it can affect the readings of the oxygen sensors. If the catalytic converter is not functioning correctly, it can lead to inaccurate oxygen sensor data, which may trigger other codes related to oxygen sensor performance.

9.7. What are the common causes of a P0135 code?

Common causes of a P0135 code include a faulty oxygen sensor, wiring issues (such as damaged or corroded wires), and problems with the engine control module (ECM).

9.8. Is it easy to replace an oxygen sensor myself?

Replacing an oxygen sensor can be straightforward, but it depends on your mechanical skills and the location of the sensor. Some sensors are easily accessible, while others may require more effort and specialized tools.

9.9. What is the difference between upstream and downstream oxygen sensors?

Upstream oxygen sensors (Sensor 1) are located before the catalytic converter and measure the oxygen content in the exhaust gases to help the ECM adjust the air-fuel mixture. Downstream oxygen sensors (Sensor 2) are located after the catalytic converter and monitor its efficiency.

9.10. Can low voltage cause the P0135 code?

Yes, low voltage to the heater circuit can cause the P0135 code. The heater circuit needs sufficient voltage to bring the oxygen sensor to its operating temperature quickly. If the voltage is too low, the ECM will detect a malfunction and trigger the code.

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