What Are OBD2 Code Reader Codes and How Do You Use Them?

Obd2 Code Reader Codes are the key to unlocking your vehicle’s health, and at OBD2-SCANNER.EDU.VN, we empower you with the knowledge to understand them and find effective solutions. These codes, also known as Diagnostic Trouble Codes (DTCs), provide valuable insights into your car’s condition, acting as a communication language for potential issues and helping you diagnose problems accurately and efficiently. Dive into our comprehensive guide to learn how to leverage these codes for optimal vehicle maintenance.

1. Understanding the OBD2 System and Your Vehicle

The On-Board Diagnostics II (OBD2) system is a standardized system implemented in most vehicles manufactured after 1996 in the United States and later adopted globally. According to the Environmental Protection Agency (EPA), this standardization was mandated to monitor and report the performance of various vehicle components, ensuring they meet emission standards.

1.1. The Role of the ECU in Decoding OBD2

At the heart of the OBD2 system is the Electronic Control Unit (ECU). The ECU constantly monitors sensors and components throughout the vehicle. When a problem is detected, the ECU generates a Diagnostic Trouble Code (DTC), providing a code that signifies the nature and location of the issue. Understanding how the ECU works is vital for accurate diagnostics and timely repairs.

1.2. Benefits of Understanding OBD2 Codes and Automotive Repairs

Understanding OBD2 codes offers numerous advantages:

• Early Issue Detection: Identify problems early, preventing costly repairs.
• Informed Decision Making: Make informed decisions about vehicle maintenance and repairs.
• Cost Savings: Save money by diagnosing and potentially fixing issues yourself.
• Enhanced Vehicle Performance: Maintain optimal vehicle performance and fuel efficiency.
• Increased Vehicle Lifespan: Extend the life of your vehicle through proactive maintenance.

2. How to Retrieve OBD2 Code Reader Codes for Accurate Diagnosis

Retrieving OBD2 codes is relatively straightforward, thanks to the standardized OBD2 port found in all compatible vehicles. Here’s a step-by-step guide:

1. Locate the OBD2 Port: The OBD2 port is typically located beneath the dashboard, near the driver’s seat. Consult your vehicle’s manual if you’re unsure of its exact location.

2. Plug in an OBD2 Scanner: Use an OBD2 scanner, readily available at auto parts stores or online. At OBD2-SCANNER.EDU.VN, we recommend investing in a quality scanner for reliable results.

3. Turn on the Ignition: Turn the ignition to the “on” position without starting the engine to power up the vehicle’s electrical system.

4. Connect the Scanner: Plug the OBD2 scanner into the vehicle’s OBD2 port and turn it on. Follow the scanner’s on-screen prompts to establish a connection with the vehicle’s ECU.

5. Read the Codes: Once connected, the scanner will communicate with your vehicle’s ECU and retrieve any stored DTCs. The scanner will display a list of codes, along with brief descriptions.

2.1. Choosing the Right OBD2 Scanner

Selecting the right OBD2 scanner is crucial for accurate diagnostics. Here are some factors to consider:

• Type of Scanner: Basic scanners read and clear codes, while advanced scanners offer features like live data streaming and bidirectional control.

• Compatibility: Ensure the scanner is compatible with your vehicle’s make and model.

• Features: Consider features like Bluetooth connectivity, smartphone app integration, and access to repair databases.

• Price: Scanners range in price from affordable to professional-grade. Choose one that fits your budget and needs.

  Feature	Basic Scanner	Advanced Scanner
  Code Reading	Yes	Yes
  Code Clearing	Yes	Yes
  Live Data	No	Yes
  Bidirectional Control	No	Yes
  Compatibility	Limited	Extensive
  Price	$20 – $50	$100 – $500+
  Recommendation	Good for basic code reading and clearing.	Ideal for comprehensive diagnostics and repairs.

2.2. What to Do If You Can’t Retrieve Codes

If you encounter issues retrieving codes, consider the following troubleshooting steps:

• Check the Connection: Ensure the scanner is securely plugged into the OBD2 port.
• Verify Power: Make sure the vehicle’s ignition is turned on to power the OBD2 system.
• Consult the Manual: Refer to the scanner’s manual for troubleshooting tips and guidance.
• Try Another Scanner: If possible, try a different scanner to rule out a faulty device.
• Seek Professional Help: If you’re unable to retrieve codes, consult a qualified mechanic for assistance.

3. Deciphering the Language: Interpreting OBD2 Code Reader Codes

Understanding OBD2 codes is essential to accurately assess your vehicle’s condition and determine the appropriate course of action. These codes are structured as a series of letters and numbers, with each character serving a specific purpose:

• First Character (P, C, B, or U): This character indicates the system associated with the fault.
  • P (Powertrain): Relates to the engine and transmission.
  • C (Chassis): Pertains to mechanical systems like steering, brakes, and suspension.
  • B (Body): Involves interior and exterior components such as airbags, lights, and locks.
  • U (Network): Indicates communication issues between different vehicle systems.
• Second Character (0-3): Specifies the code type.
  • 0: Generic (SAE) code, applicable to all vehicles.
  • 1, 2, 3: Manufacturer-specific code.
• Third and Fourth Characters: Provide additional information about the fault’s location or nature.
• Fifth Character: Indicates the specific component or system affected.

3.1. Mastering the Art of Decoding

To master the art of decoding OBD2 codes, consider these tips:

• Use a Reliable Code Reader: Invest in a high-quality OBD2 scanner that provides detailed code descriptions.
• Consult Repair Databases: Access online repair databases or subscription services for in-depth code information and troubleshooting guides.
• Refer to Vehicle Manuals: Consult your vehicle’s repair manual for manufacturer-specific code definitions and diagnostic procedures.

3.2 Understanding Generic vs. Manufacturer-Specific Codes

It’s essential to differentiate between generic and manufacturer-specific codes for accurate diagnosis. Generic codes are standardized across all vehicle makes and models, while manufacturer-specific codes are unique to a particular brand. According to a study by the National Institute for Automotive Service Excellence (ASE), misinterpreting manufacturer-specific codes can lead to incorrect diagnoses and unnecessary repairs.

4. Common OBD2 Code Reader Codes and Their Meanings

OBD2 codes are categorized into four main groups, each represented by the first character in the code. Here’s a breakdown of common codes and their meanings:

4.1. P0xxx – Powertrain Codes: Engine and Transmission Issues

Powertrain codes primarily relate to engine and transmission issues. Here are some common examples:

• P0300 – Random/Multiple Cylinder Misfire Detected: Indicates that one or more cylinders are misfiring, which can cause rough idling, poor acceleration, and reduced fuel economy. According to a study by AAA, misfires can reduce fuel efficiency by as much as 30%.
• P0420 – Catalyst System Efficiency Below Threshold: Signals that the catalytic converter is not functioning efficiently, leading to increased emissions and potential damage to the exhaust system. A faulty catalytic converter can significantly increase vehicle emissions, violating environmental regulations.
• P0171 – System Too Lean (Bank 1): Indicates that the engine is receiving too much air and not enough fuel, which can cause poor performance and potential engine damage. A lean condition can lead to overheating and premature wear of engine components.
• P0128 – Coolant Temperature Below Thermostat Regulating Temperature: Signifies that the engine is not reaching its optimal operating temperature, which can affect fuel economy and engine performance. Maintaining proper coolant temperature is essential for efficient engine operation.
• P0442 – Evaporative Emission Control System Leak Detected (Small Leak): Indicates a small leak in the evaporative emission control system, which can cause fuel vapors to escape into the atmosphere. Addressing EVAP leaks promptly helps reduce harmful emissions and maintain air quality.

4.2. C0xxx – Chassis Codes: Steering, Braking, and Suspension

Chassis codes pertain to issues with the vehicle’s chassis and related components, including steering, braking, and suspension:

• C0035 – Left Front Wheel Speed Sensor Circuit: Indicates a problem with the wheel speed sensor on the left front wheel, which can affect the anti-lock braking system (ABS) and traction control system. Faulty wheel speed sensors can compromise vehicle safety and handling.
• C1214 – Brake Control Relay Contact Circuit Open: Signals an issue with the brake control relay, which can affect the ABS and stability control systems. A malfunctioning brake control relay can impair braking performance and increase the risk of accidents.
• C0036 – Right Front Wheel Speed Sensor Circuit: Indicates a problem with the wheel speed sensor on the right front wheel, similar to C0035.
• C0561 – ABS Brake Control Module System: Signals a problem with the ABS brake control module, which can affect the overall functionality of the ABS system.
• C1210 – Brake Fluid Pressure Sensor Circuit: Indicates an issue with the brake fluid pressure sensor, which can affect the accuracy of the ABS and stability control systems.

4.3. B0xxx – Body Codes: Interior and Exterior Components

Body codes involve problems with various interior and exterior components, such as airbags, lights, and locks:

• B0020 – Front Passenger Side Deployment Loop Resistance High: Indicates a problem with the airbag deployment loop on the front passenger side, which can affect the functionality of the airbag system. Addressing airbag issues promptly is crucial for passenger safety.
• B1000 – Electronic Frontal Sensor Data: Signals an issue with the electronic frontal sensor, which is responsible for detecting front-end collisions and triggering airbag deployment.
• B1200 – Climate Control Push Button Circuit Open: Indicates a problem with the climate control push button circuit, which can affect the operation of the climate control system.
• B1325 – Oil Pressure Sensor Circuit: Signals an issue with the oil pressure sensor, which monitors the engine’s oil pressure and alerts the driver to potential problems.
• B1422 – Seat Belt Pretensioner Deployment Control Circuit: Indicates a problem with the seat belt pretensioner deployment control circuit, which can affect the functionality of the seat belt system during a collision.

4.4. U0xxx – Network Codes: Communication Issues

Network codes indicate communication issues between different vehicle systems:

• U0100 – Lost Communication with ECM/PCM “A”: Signals a loss of communication with the Engine Control Module (ECM) or Powertrain Control Module (PCM), which can affect various vehicle functions. Communication issues with the ECM/PCM can lead to a wide range of performance problems.
• U0121 – Lost Communication with Anti-Lock Brake System (ABS) Control Module: Indicates a loss of communication with the ABS control module, which can affect the functionality of the ABS system.
• U0073 – Control Module Communication Bus “A” Off: Signals a problem with the control module communication bus, which can disrupt communication between different vehicle systems.
• U0140 – Lost Communication with Body Control Module: Indicates a loss of communication with the Body Control Module (BCM), which can affect various body-related functions such as lights, locks, and windows.
• U0401 – Invalid Data Received from Engine Control Module (ECM): Signals that the ECM is sending invalid data to other vehicle systems, which can cause various performance issues.

5. Tips for Diagnosing OBD2 Code Reader Code Related Issues

While OBD2 codes provide valuable information, they’re just the starting point for diagnosing and resolving vehicle problems. Here are some essential tips to help you address issues effectively:

• Verify the Code: Before taking any action, verify the code with a reliable source to ensure accuracy.
• Gather Additional Information: Collect as much information as possible about the problem, including when it occurs, what symptoms are present, and any recent maintenance or repairs.
• Inspect the Vehicle: Conduct a thorough visual inspection of the vehicle, looking for obvious signs of damage, leaks, or loose connections.
• Use a Diagnostic Approach: Follow a systematic diagnostic approach, starting with the most likely causes and working your way through the possibilities.
• Test Components: Use diagnostic tools, such as multimeters and test lights, to test the functionality of individual components and circuits.
• Consult with a Professional: If you’re unsure about the problem or lack the necessary tools, consider consulting a qualified mechanic who can diagnose and fix the issue.
• Regular Maintenance: Keep up with routine maintenance to minimize the chances of triggering OBD2 codes due to neglect.
• Check for Recalls: Some issues may be covered by manufacturer recalls or warranties, so it’s worth checking with your vehicle’s manufacturer.

5.1. When to Seek Professional Assistance

While many OBD2 code-related issues can be resolved with basic tools and knowledge, certain situations require professional assistance. Consider seeking help from a qualified mechanic if:

• You’re uncomfortable working on your vehicle.
• You lack the necessary tools or equipment.
• The problem is complex or difficult to diagnose.
• The vehicle is not safe to drive.
• You’ve attempted to fix the problem without success.

At OBD2-SCANNER.EDU.VN, we maintain a network of certified mechanics who can provide expert diagnostics and repair services. Contact us today for assistance.

5.2. What the Experts Say

According to a report by the Automotive Service Association (ASA), proper diagnosis and repair of OBD2 code-related issues require a combination of technical knowledge, diagnostic skills, and access to reliable information. The ASA recommends that vehicle owners consult with qualified technicians who have the expertise and equipment to accurately diagnose and resolve complex automotive problems.

6. OBD2 Code Reader Code List Reference

For your convenience, here’s a more comprehensive list of common OBD2 codes along with their descriptions:

6.1. Powertrain Codes (P0xxx)

Code	Description	Possible Causes
P0011	“A” Camshaft Position – Timing Over-Advanced or System Performance (Bank 1)	Low oil level, faulty camshaft actuator, timing chain issues
P0014	“B” Camshaft Position – Timing Over-Advanced or System Performance (Bank 1)	Similar to P0011
P0030	HO2S Heater Control Circuit (Bank 1, Sensor 1)	Faulty oxygen sensor, wiring issues, ECM failure
P0031	HO2S Heater Control Circuit Low (Bank 1, Sensor 1)	Similar to P0030
P0032	HO2S Heater Control Circuit High (Bank 1, Sensor 1)	Similar to P0030
P0050	HO2S Heater Control Circuit (Bank 2, Sensor 1)	Similar to P0030, but for Bank 2
P0051	HO2S Heater Control Circuit Low (Bank 2, Sensor 1)	Similar to P0031, but for Bank 2
P0052	HO2S Heater Control Circuit High (Bank 2, Sensor 1)	Similar to P0032, but for Bank 2
P0100	Mass or Volume Air Flow Circuit	Dirty or faulty MAF sensor, wiring issues
P0101	Mass or Volume Air Flow Circuit Range/Performance	Similar to P0100
P0102	Mass or Volume Air Flow Circuit Low Input	Similar to P0100
P0103	Mass or Volume Air Flow Circuit High Input	Similar to P0100
P0104	Mass or Volume Air Flow Circuit Intermittent	Similar to P0100
P0110	Intake Air Temperature Circuit	Faulty IAT sensor, wiring issues
P0111	Intake Air Temperature Circuit Range/Performance	Similar to P0110
P0112	Intake Air Temperature Circuit Low Input	Similar to P0110
P0113	Intake Air Temperature Circuit High Input	Similar to P0110
P0115	Engine Coolant Temperature Circuit	Faulty ECT sensor, wiring issues
P0116	Engine Coolant Temperature Circuit Range/Performance	Similar to P0115
P0117	Engine Coolant Temperature Circuit Low Input	Similar to P0115
P0118	Engine Coolant Temperature Circuit High Input	Similar to P0115
P0120	Throttle/Pedal Position Sensor/Switch A Circuit	Faulty TPS, wiring issues
P0121	Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance	Similar to P0120
P0122	Throttle/Pedal Position Sensor/Switch A Circuit Low Input	Similar to P0120
P0123	Throttle/Pedal Position Sensor/Switch A Circuit High Input	Similar to P0120
P0125	Insufficient Coolant Temperature for Closed Loop Fuel Control	Low coolant level, faulty ECT sensor, thermostat issues
P0128	Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)	Faulty thermostat
P0130	O2 Sensor Circuit (Bank 1, Sensor 1)	Faulty oxygen sensor, wiring issues
P0131	O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)	Similar to P0130
P0132	O2 Sensor Circuit High Voltage (Bank 1, Sensor 1)	Similar to P0130
P0133	O2 Sensor Circuit Slow Response (Bank 1, Sensor 1)	Similar to P0130
P0134	O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)	Similar to P0130
P0135	O2 Sensor Heater Circuit (Bank 1, Sensor 1)	Similar to P0030
P0136	O2 Sensor Circuit (Bank 1, Sensor 2)	Similar to P0130, but for Sensor 2
P0137	O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)	Similar to P0131, but for Sensor 2
P0138	O2 Sensor Circuit High Voltage (Bank 1, Sensor 2)	Similar to P0132, but for Sensor 2
P0139	O2 Sensor Circuit Slow Response (Bank 1, Sensor 2)	Similar to P0133, but for Sensor 2
P0140	O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 2)	Similar to P0134, but for Sensor 2
P0141	O2 Sensor Heater Circuit (Bank 1, Sensor 2)	Similar to P0030, but for Sensor 2
P0150	O2 Sensor Circuit (Bank 2, Sensor 1)	Similar to P0130, but for Bank 2
P0151	O2 Sensor Circuit Low Voltage (Bank 2, Sensor 1)	Similar to P0131, but for Bank 2
P0152	O2 Sensor Circuit High Voltage (Bank 2, Sensor 1)	Similar to P0132, but for Bank 2
P0153	O2 Sensor Circuit Slow Response (Bank 2, Sensor 1)	Similar to P0133, but for Bank 2
P0154	O2 Sensor Circuit No Activity Detected (Bank 2, Sensor 1)	Similar to P0134, but for Bank 2
P0155	O2 Sensor Heater Circuit (Bank 2, Sensor 1)	Similar to P0030, but for Bank 2
P0156	O2 Sensor Circuit (Bank 2, Sensor 2)	Similar to P0130, but for Bank 2, Sensor 2
P0157	O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2)	Similar to P0131, but for Bank 2, Sensor 2
P0158	O2 Sensor Circuit High Voltage (Bank 2, Sensor 2)	Similar to P0132, but for Bank 2, Sensor 2
P0159	O2 Sensor Circuit Slow Response (Bank 2, Sensor 2)	Similar to P0133, but for Bank 2, Sensor 2
P0160	O2 Sensor Circuit No Activity Detected (Bank 2, Sensor 2)	Similar to P0134, but for Bank 2, Sensor 2
P0161	O2 Sensor Heater Circuit (Bank 2, Sensor 2)	Similar to P0030, but for Bank 2, Sensor 2
P0170	Fuel Trim, Bank 1	Vacuum leaks, faulty oxygen sensor, fuel injector issues
P0171	System Too Lean, Bank 1	Similar to P0170
P0172	System Too Rich, Bank 1	Fuel injector issues, faulty oxygen sensor, high fuel pressure
P0173	Fuel Trim, Bank 2	Similar to P0170, but for Bank 2
P0174	System Too Lean, Bank 2	Similar to P0171, but for Bank 2
P0175	System Too Rich, Bank 2	Similar to P0172, but for Bank 2
P0300	Random Misfire Detected	Ignition system issues, fuel system problems, vacuum leaks, engine mechanical issues
P0301	Cylinder 1 Misfire Detected	Faulty spark plug, ignition coil, fuel injector, compression issues
P0302	Cylinder 2 Misfire Detected	Similar to P0301, but for Cylinder 2
P0303	Cylinder 3 Misfire Detected	Similar to P0301, but for Cylinder 3
P0304	Cylinder 4 Misfire Detected	Similar to P0301, but for Cylinder 4
P0305	Cylinder 5 Misfire Detected	Similar to P0301, but for Cylinder 5 (if applicable)
P0306	Cylinder 6 Misfire Detected	Similar to P0301, but for Cylinder 6 (if applicable)
P0325	Knock Sensor 1 Circuit (Bank 1 or Single Sensor)	Faulty knock sensor, wiring issues
P0326	Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)	Similar to P0325
P0327	Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)	Similar to P0325
P0328	Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)	Similar to P0325
P0400	Exhaust Gas Recirculation Flow	Clogged EGR valve or passages, faulty EGR solenoid, vacuum leaks
P0401	Exhaust Gas Recirculation Flow Insufficient Detected	Similar to P0400
P0402	Exhaust Gas Recirculation Flow Excessive Detected	Similar to P0400
P0410	Secondary Air Injection System	Faulty air pump, check valve issues, clogged air passages
P0411	Secondary Air Injection System Incorrect Flow Detected	Similar to P0410
P0420	Catalyst System Efficiency Below Threshold (Bank 1)	Faulty catalytic converter, exhaust leaks, faulty oxygen sensors
P0430	Catalyst System Efficiency Below Threshold (Bank 2)	Similar to P0420, but for Bank 2
P0440	Evaporative Emission Control System	Leaks in EVAP system, faulty gas cap, purge valve issues
P0441	Evaporative Emission Control System Incorrect Purge Flow	Similar to P0440
P0442	Evaporative Emission Control System Leak Detected (Small Leak)	Similar to P0440
P0446	Evaporative Emission Control System Vent Control Circuit	Faulty vent valve, wiring issues
P0455	Evaporative Emission Control System Leak Detected (Gross Leak)	Similar to P0440, larger leak than P0442
P0456	Evaporative Emission Control System Leak Detected (Very Small Leak)	Similar to P0440, very small leak, difficult to detect
P0500	Vehicle Speed Sensor	Faulty VSS, wiring issues
P0505	Idle Air Control System	Dirty or faulty IAC valve, vacuum leaks
P0506	Idle Air Control System RPM Lower Than Expected	Similar to P0505
P0507	Idle Air Control System RPM Higher Than Expected	Similar to P0505
P0601	Internal Control Module Memory Check Sum Error	ECM failure
P0605	Internal Control Module Read Only Memory (ROM) Error	ECM failure
P0700	Transmission Control System	Internal transmission issues, faulty TCM, wiring issues
P0705	Transmission Range Sensor Circuit	Faulty TRS, wiring issues
P0711	Transmission Fluid Temperature Sensor Circuit Range/Performance	Faulty TFT sensor, wiring issues
P0712	Transmission Fluid Temperature Sensor Circuit Low Input	Similar to P0711
P0713	Transmission Fluid Temperature Sensor Circuit High Input	Similar to P0711
P0715	Input/Turbine Speed Sensor Circuit	Faulty ISS, wiring issues
P0716	Input/Turbine Speed Sensor Circuit Range/Performance	Similar to P0715
P0717	Input/Turbine Speed Sensor Circuit No Signal	Similar to P0715
P0720	Output Speed Sensor Circuit	Faulty OSS, wiring issues
P0721	Output Speed Sensor Circuit Range/Performance	Similar to P0720
P0722	Output Speed Sensor Circuit No Signal	Similar to P0720
P0740	Torque Converter Clutch Circuit	Faulty TCC solenoid, wiring issues, internal transmission issues
P0741	Torque Converter Clutch Circuit Performance or Stuck Off	Similar to P0740
P0742	Torque Converter Clutch Circuit Stuck On	Similar to P0740
P0743	Torque Converter Clutch Circuit Electrical	Similar to P0740
P0750	Shift Solenoid A	Faulty shift solenoid, wiring issues, internal transmission issues
P0751	Shift Solenoid A Performance or Stuck Off	Similar to P0750
P0752	Shift Solenoid A Stuck On	Similar to P0750
P0753	Shift Solenoid A Electrical	Similar to P0750
P0755	Shift Solenoid B	Similar to P0750, but for Shift Solenoid B
P0756	Shift Solenoid B Performance or Stuck Off	Similar to P0751, but for Shift Solenoid B
P0757	Shift Solenoid B Stuck On	Similar to P0752, but for Shift Solenoid B
P0758	Shift Solenoid B Electrical	Similar to P0753, but for Shift Solenoid B
P0760	Shift Solenoid C	Similar to P0750, but for Shift Solenoid C (if applicable)
P0761	Shift Solenoid C Performance or Stuck Off	Similar to P0751, but for Shift Solenoid C (if applicable)
P0762	Shift Solenoid C Stuck On	Similar to P0752, but for Shift Solenoid C (if applicable)
P0763	Shift Solenoid C Electrical	Similar to P0753, but for Shift Solenoid C (if applicable)
P0770	Shift Solenoid E	Similar to P0750, but for Shift Solenoid E (if applicable)
P0771	Shift Solenoid E Performance or Stuck Off	Similar to P0751, but for Shift Solenoid E (if applicable)
P0772	Shift Solenoid E Stuck On	Similar to P0752, but for Shift Solenoid E (if applicable)
P0773	Shift Solenoid E Electrical	Similar to P0753, but for Shift Solenoid E (if applicable)
P0780	Shift	Internal transmission issues
P0796	Pressure Control Solenoid “C” Performance or Stuck Off	Faulty Pressure Control Solenoid C, wiring issues, internal transmission issues
P0797	Pressure Control Solenoid “C” Stuck On	Similar to P0796
P0841	Transmission Fluid Pressure Sensor/Switch “A” Circuit Range/Performance	Faulty Transmission Fluid Pressure Sensor, wiring issues, internal transmission issues
P0842	Transmission Fluid Pressure Sensor/Switch “A” Circuit Low	Similar to P0841
P0843	Transmission Fluid Pressure Sensor/Switch “A” Circuit High	Similar to P0841
P0846	Transmission Fluid Pressure Sensor/Switch “B” Circuit Range/Performance	Similar to P0841, but for Sensor/Switch “B”
P0847	Transmission Fluid Pressure Sensor/Switch “B” Circuit Low	Similar to P0842, but for Sensor/Switch “B”
P0848	Transmission Fluid Pressure Sensor/Switch “B” Circuit High	Similar to P0843, but for Sensor/Switch “B”
P0850	Park/Neutral Switch Input Circuit	Faulty Park/Neutral Switch, wiring issues
P0851	Park/Neutral Switch Input Circuit Low	Similar to P0850
P0852	Park/Neutral Switch Input Circuit High	Similar to P0850
P086