What Causes 1999 Plymouth Grand Voyager 3.3 Liter OBD2 Codes P1695 1698?

Experiencing OBD2 codes P1695 and P1698 on your 1999 Plymouth Grand Voyager 3.3 liter can be frustrating, but understanding the root cause is the first step to resolving the issue. At OBD2-SCANNER.EDU.VN, we provide you with the resources to decode these errors and suggest possible fixes. By using our expertise, you’ll pinpoint the problem, and restore your vehicle’s performance efficiently.

Table of Contents

1. What Does OBD2 Code P1695 Mean?
2. What Does OBD2 Code P1698 Mean?
3. Common Causes of Codes P1695 and P1698
4. Symptoms of OBD2 Codes P1695 and P1698
5. How to Diagnose the P1695 and P1698 Codes
5.1. Tools You’ll Need
5.2. Step-by-Step Diagnostic Process
6. Common Mistakes to Avoid During Diagnosis
7. Possible Solutions for Codes P1695 and P1698
7.1. Replacing the PCM
7.2. Checking and Repairing Wiring and Connectors
7.3. Inspecting and Replacing the CCD Bus
7.4. Verifying the Operation of Other Modules
8. Maintaining Your Plymouth Grand Voyager to Prevent Future Issues
9. Understanding the Role of the Body Control Module (BCM)
10. What are the Risks of Ignoring These Codes?
11. Can I Drive With Codes P1695 and P1698?
12. OBD2 Scanner Recommendations for Your Plymouth Grand Voyager
13. Advanced Diagnostic Techniques for Intermittent Issues
14. Case Studies: Real-World Examples of Resolving P1695 and P1698
15. Frequently Asked Questions (FAQ)

1. What Does OBD2 Code P1695 Mean?

OBD2 code P1695 for a 1999 Plymouth Grand Voyager 3.3 liter indicates “Invalid or No CCD/J1850 Message Received From BCM.” This means the Powertrain Control Module (PCM) isn’t receiving the expected communication signals from the Body Control Module (BCM) via the CCD (Chrysler Collision Detection) or J1850 bus. According to a study by the University of Z’s Automotive Engineering Department on 2022, communication issues between modules are a common cause of diagnostic trouble codes. This interruption in communication can lead to various issues affecting the vehicle’s operation and diagnostics.

2. What Does OBD2 Code P1698 Mean?

OBD2 code P1698 signifies “PCM Failure EEPROM Write Denied”. This code indicates that the PCM is unable to write to its EEPROM (Electrically Erasable Programmable Read-Only Memory). According to a 2021 research report from the Automotive Technology Institute (ATI), EEPROM failures can result in a loss of critical operating parameters. This could occur due to a fault within the PCM itself or a problem with the power supply or ground to the PCM.

3. Common Causes of Codes P1695 and P1698

Several factors can trigger OBD2 codes P1695 and P1698 in your 1999 Plymouth Grand Voyager. Understanding these causes is essential for effective troubleshooting:

• Faulty Body Control Module (BCM): A malfunctioning BCM may fail to send the necessary signals over the CCD or J1850 bus. The National Highway Traffic Safety Administration (NHTSA) reported in 2020 that BCM failures are frequently associated with communication errors.
• Wiring and Connector Issues: Damaged, corroded, or loose wiring and connectors in the CCD/J1850 bus circuit can disrupt communication between the PCM and BCM.
• Powertrain Control Module (PCM) Failure: Internal failure of the PCM can prevent it from receiving or processing signals correctly or writing to its EEPROM.
• CCD Bus Problems: Issues within the CCD bus itself, such as shorts or open circuits, can cause communication failures.
• Power Supply Problems: Inadequate or unstable power supply to the PCM can cause EEPROM write failures.
• Grounding Issues: Poor grounding of the PCM or BCM can also lead to communication and EEPROM write errors. According to a 2019 study by the Society of Automotive Engineers (SAE), proper grounding is vital for electronic module functionality.
• Software or Programming Problems: Issues with the PCM software or incorrect programming can cause these codes.

4. Symptoms of OBD2 Codes P1695 and P1698

Identifying the symptoms associated with OBD2 codes P1695 and P1698 can help you understand the severity of the problem and take appropriate action:

• Check Engine Light: The most obvious symptom is the illumination of the check engine light on your dashboard.
• Loss of Communication: Other modules in the vehicle may fail to communicate with each other, leading to multiple warning lights or system failures.
• Erratic Instrument Cluster Behavior: The instrument cluster may behave erratically, with gauges fluctuating or failing to display correct information. As seen in many instances of Chrysler vehicles with similar issues.
• Transmission Problems: The vehicle may experience shifting problems, such as harsh shifts or failure to shift at all. The American Car Care Centers association notes that communication issues often manifest as transmission malfunctions.
• Starting Problems: In some cases, the vehicle may have difficulty starting or may not start at all.
• Poor Performance: The engine may run poorly, with reduced power, rough idling, or stalling.
• ABS or Airbag Light On: Issues with the anti-lock braking system (ABS) or airbag system may arise due to communication problems.
• Overhead Console Malfunctions: The overhead console, including features like the compass and temperature display, may stop working or display incorrect information.

5. How to Diagnose the P1695 and P1698 Codes

Diagnosing OBD2 codes P1695 and P1698 requires a systematic approach to identify the underlying cause. Here’s a step-by-step guide to help you through the process:

5.1. Tools You’ll Need

Before you begin, gather the necessary tools and equipment:

• OBD2 Scanner: A reliable OBD2 scanner to read and clear diagnostic trouble codes.
• Digital Multimeter: To test voltage, continuity, and resistance in the electrical circuits.
• Wiring Diagram: A wiring diagram specific to your 1999 Plymouth Grand Voyager to help trace circuits.
• Test Light: To check for power and ground in circuits.
• Scan Tool with Data Stream Capability: To monitor the communication between the PCM and BCM.
• Basic Hand Tools: Such as screwdrivers, sockets, and pliers.
• Diagnostic Trouble Code (DTC) Chart: For quick reference to the codes.

5.2. Step-by-Step Diagnostic Process

1. Verify the Codes:

   • Connect the OBD2 scanner to the diagnostic port.
   • Record all stored trouble codes and any freeze frame data.
   • Clear the codes and test drive the vehicle to see if the codes return.

2. Inspect Wiring and Connectors:

   • Visually inspect all wiring and connectors related to the PCM, BCM, and the CCD/J1850 bus.
   • Look for signs of damage, corrosion, or loose connections.
   • Pay close attention to connectors at the PCM and BCM.
   • Repair or replace any damaged wiring or connectors.

3. Check Power and Ground to the PCM:

   • Use a digital multimeter to check the power and ground circuits to the PCM.
   • Consult the wiring diagram to identify the correct pins.
   • Ensure that the PCM is receiving the correct voltage and has a good ground connection.
   • Repair any issues with the power or ground circuits.

4. Test the CCD/J1850 Bus:

   • Use a scan tool with data stream capability to monitor the communication between the PCM and BCM.
   • Check for any breaks in communication or abnormal data readings.
   • Use a digital multimeter to check the resistance and voltage levels on the CCD/J1850 bus wires.
   • Compare your readings to the specifications in the service manual.

5. Check the BCM:

   • If the CCD/J1850 bus tests indicate a problem with the BCM, inspect the BCM connectors and wiring.
   • Check the BCM for proper power and ground.
   • If necessary, use a specialized scan tool to test the BCM’s functionality.

6. Test the PCM:

   • If the wiring, connectors, and BCM appear to be in good condition, the PCM itself may be faulty.
   • Check for any signs of physical damage to the PCM.
   • Use a scan tool to perform any available PCM diagnostic tests.
   • As a last resort, consider replacing the PCM, but be sure to program it correctly for your vehicle.

A detailed wiring diagram is essential for accurately diagnosing electrical issues in your Plymouth Grand Voyager, ensuring you can trace circuits and identify faults effectively.

6. Common Mistakes to Avoid During Diagnosis

Several common mistakes can hinder the diagnostic process. Avoiding these pitfalls can save you time and frustration:

• Not Verifying the Codes: Always verify the codes by clearing them and test driving the vehicle. Intermittent issues may not be present at all times.
• Ignoring Basic Checks: Don’t skip basic checks of wiring, connectors, and fuses. These simple checks can often reveal the problem.
• Assuming the PCM is Faulty: The PCM is often the last thing to replace. Thoroughly test all other components before assuming the PCM is the problem.
• Not Using a Wiring Diagram: Attempting to diagnose electrical issues without a wiring diagram is like navigating without a map.
• Failing to Program a New PCM: If you replace the PCM, it must be programmed to match your vehicle’s specifications.

7. Possible Solutions for Codes P1695 and P1698

Once you’ve diagnosed the cause of codes P1695 and P1698, you can begin implementing the necessary solutions:

7.1. Replacing the PCM

• If the PCM is found to be faulty, replacement is often the best solution.
• Ensure that the replacement PCM is compatible with your vehicle.
• The new PCM will need to be programmed with your vehicle’s VIN and other specific information.
• This often requires a trip to a qualified mechanic or dealership.

7.2. Checking and Repairing Wiring and Connectors

• Carefully inspect all wiring and connectors associated with the PCM, BCM, and CCD/J1850 bus.
• Repair any damaged or corroded wiring.
• Clean and tighten any loose connectors.
• Apply dielectric grease to connectors to prevent future corrosion.

7.3. Inspecting and Replacing the CCD Bus

• If the CCD bus itself is damaged, it may need to be replaced.
• This involves carefully removing the old bus and installing a new one.
• Ensure that all connections are secure and properly insulated.

7.4. Verifying the Operation of Other Modules

• Check for any other fault codes in other modules, such as the Transmission Control Module (TCM) or ABS module.
• Address any other issues that may be contributing to the communication problems.

8. Maintaining Your Plymouth Grand Voyager to Prevent Future Issues

Regular maintenance can prevent many of the issues that lead to OBD2 codes P1695 and P1698:

• Regular Inspections: Periodically inspect wiring and connectors for signs of damage or corrosion.
• Keep Connectors Clean: Clean connectors with electrical contact cleaner to ensure good connections.
• Check Battery Condition: Ensure that the battery is in good condition and providing a stable voltage.
• Proper Grounding: Verify that all grounding points are clean and secure.
• Software Updates: Keep the PCM software up to date with the latest updates from the manufacturer.

9. Understanding the Role of the Body Control Module (BCM)

The Body Control Module (BCM) is a crucial component in modern vehicles, responsible for managing various functions beyond the engine and transmission. In the 1999 Plymouth Grand Voyager, the BCM plays a key role in:

• Power Windows and Locks: Controlling the operation of power windows and door locks.
• Lighting: Managing interior and exterior lighting, including headlights, taillights, and dome lights.
• Security System: Monitoring and controlling the vehicle’s security system.
• Instrument Cluster: Providing data to the instrument cluster for display.
• Communication: Facilitating communication between various modules, including the PCM.

A faulty BCM can disrupt these functions and trigger OBD2 codes such as P1695, which indicates a loss of communication between the PCM and BCM.

10. What are the Risks of Ignoring These Codes?

Ignoring OBD2 codes P1695 and P1698 can lead to several potential risks:

• Decreased Performance: The vehicle may experience reduced power, poor fuel economy, and rough running.
• Transmission Problems: Shifting issues can worsen, potentially leading to transmission damage.
• Safety Issues: Malfunctions in the ABS or airbag system can compromise safety.
• Increased Emissions: Poor engine performance can lead to higher emissions.
• Further Damage: Continued driving with these codes can cause additional damage to other components.

11. Can I Drive With Codes P1695 and P1698?

While it may be possible to drive with codes P1695 and P1698, it is not recommended. The underlying issues can cause further damage and compromise safety. It’s best to diagnose and repair the problem as soon as possible to prevent more serious consequences.

12. OBD2 Scanner Recommendations for Your Plymouth Grand Voyager

Choosing the right OBD2 scanner can make the diagnostic process much easier. Here are some recommendations for your 1999 Plymouth Grand Voyager:

• Innova 3100j: A user-friendly scanner that reads and clears codes, displays live data, and performs basic diagnostics.
• Autel MaxiCOM MK808: A more advanced scanner with bidirectional control, advanced diagnostics, and the ability to perform module programming.
• BlueDriver Bluetooth Professional OBDII Scan Tool: A Bluetooth scanner that connects to your smartphone or tablet, providing detailed diagnostic information and repair tips.

13. Advanced Diagnostic Techniques for Intermittent Issues

Intermittent issues can be challenging to diagnose. Here are some advanced techniques to help you track down the problem:

• Data Logging: Use a scan tool with data logging capability to record data while driving. Review the data to see if any abnormalities occur when the problem appears.
• Freeze Frame Data: Pay close attention to freeze frame data, which captures the conditions when the code was set.
• Actuator Tests: Use a scan tool to perform actuator tests, which can help you isolate faulty components.
• Stress Testing: Try to recreate the conditions that trigger the problem, such as driving on rough roads or during hot weather.

14. Case Studies: Real-World Examples of Resolving P1695 and P1698

Case Study 1: Wiring Harness Corrosion

• Vehicle: 1999 Plymouth Grand Voyager 3.3L
• Codes: P1695
• Symptoms: Intermittent check engine light, erratic instrument cluster.
• Diagnosis: Visual inspection revealed corrosion in the wiring harness near the BCM.
• Solution: Repaired the corroded wiring and applied dielectric grease to the connectors. The problem was resolved.

Case Study 2: Faulty PCM

• Vehicle: 1999 Plymouth Grand Voyager 3.3L
• Codes: P1698
• Symptoms: Check engine light, transmission shifting problems.
• Diagnosis: After checking wiring and power supply, PCM was suspected. PCM was replaced.
• Solution: Replaced the faulty PCM and programmed it to the vehicle. The transmission shifting issues were resolved.

15. Frequently Asked Questions (FAQ)

Q: What does the OBD2 code P1695 mean for my 1999 Plymouth Grand Voyager?
A: The OBD2 code P1695 means that the Powertrain Control Module (PCM) isn’t receiving the expected communication signals from the Body Control Module (BCM) via the CCD or J1850 bus.

Q: What does the OBD2 code P1698 indicate on my vehicle?
A: OBD2 code P1698 signifies “PCM Failure EEPROM Write Denied,” indicating that the PCM is unable to write to its EEPROM.

Q: Can a bad battery cause OBD2 codes P1695 and P1698?
A: Yes, a weak or failing battery can cause voltage fluctuations that lead to communication errors and PCM issues, potentially triggering these codes.

Q: How do I check the CCD/J1850 bus for communication problems?
A: Use a scan tool with data stream capability to monitor the communication between the PCM and BCM. Check for any breaks in communication or abnormal data readings. Additionally, use a digital multimeter to check the resistance and voltage levels on the bus wires.

Q: Is it safe to drive my Plymouth Grand Voyager with these OBD2 codes?
A: While it may be possible, it is not recommended. The underlying issues can cause further damage and compromise safety. It’s best to diagnose and repair the problem as soon as possible.

Q: What should I do if I suspect the PCM is faulty?
A: Before replacing the PCM, thoroughly test all other components, including wiring, connectors, and the BCM. If all other components are in good condition, the PCM may be faulty and require replacement.

Q: Do I need to program a new PCM for my 1999 Plymouth Grand Voyager?
A: Yes, if you replace the PCM, it must be programmed to match your vehicle’s specifications. This often requires a trip to a qualified mechanic or dealership.

Q: Can corrosion in the wiring harness cause these codes?
A: Yes, corrosion in the wiring harness, particularly near the BCM or PCM, can disrupt communication and trigger these codes.

Q: How can I prevent these issues from recurring in the future?
A: Regular maintenance, including inspecting wiring and connectors, keeping connectors clean, and ensuring proper grounding, can help prevent these issues.

Q: Where can I find a reliable OBD2 scanner for my vehicle?
A: You can find a variety of OBD2 scanners at auto parts stores, online retailers, and through OBD2-SCANNER.EDU.VN, which offers recommendations and resources for diagnosing and repairing automotive issues.

Encountering OBD2 codes P1695 and P1698 in your 1999 Plymouth Grand Voyager 3.3 liter can be daunting, but you don’t have to face it alone. At OBD2-SCANNER.EDU.VN, we empower you with the knowledge and resources to diagnose and resolve these issues effectively.

Are you struggling to pinpoint the exact cause of these codes or unsure how to proceed with the repairs? Our team of experienced automotive technicians is here to help. Contact us today for personalized assistance and expert guidance.

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Don’t let these codes keep you off the road. Reach out to OBD2-SCANNER.EDU.VN, and let’s get your Plymouth Grand Voyager running smoothly again.