P068A Code: Here's How to Solve It Fast

The P068A code is a diagnostic trouble code (DTC) that indicates an issue with the Engine Control Module (ECM) or Powertrain Control Module (PCM) power relay. Specifically, it means that the ECM/PCM power relay has de-energized too early, potentially causing various engine performance problems. This code is relatively uncommon but can be quite serious if left unaddressed.

P068A Code Meaning	P068A Code Common Causes
ECM/PCM Power Relay De-Energized Performance - Too Early	Faulty PCM power relay
Non-volatile random access memory (NVRAM) write failure	Low battery voltage
PCM shutdown issue	Damaged wiring or connectors
Electrical system malfunction	Blown fuse or fusible link
Power supply interruption to ECM/PCM	Faulty ECM/PCM

Understanding the P068A Code

The P068A code is set when the ECM or PCM detects that its power relay has de-energized prematurely. This can happen during the shutdown process when the ignition is turned off. Normally, the PCM needs a short period to complete certain tasks, such as storing data in its non-volatile memory, before shutting down completely. If the power is cut too soon, it can lead to various issues and trigger this code.

Symptoms of P068A

When your vehicle's computer detects the P068A code, you may experience one or more of the following symptoms:

1. Illuminated Check Engine Light
2. Engine hard to start or fails to start
3. Engine stalling
4. Poor engine performance
5. Reduced fuel efficiency
6. Intermittent electrical issues

In some cases, you might not notice any immediate symptoms other than the Check Engine Light. However, it's crucial to address this code promptly to prevent potential damage to your vehicle's electrical system or ECM/PCM.

Technical Explanation

The ECM/PCM power relay is responsible for supplying power to the engine control module. When you turn off your vehicle, the PCM typically requires a short period (usually a few seconds) to complete its shutdown procedures, including saving important data to its non-volatile memory. The P068A code indicates that this process was interrupted due to the power relay de-energizing too quickly.

This premature de-energizing can be caused by various factors, including electrical system issues, faulty relays, or problems with the PCM itself. In some cases, it may also be related to battery voltage issues or damaged wiring.

Diagnosing the P068A Code

To properly diagnose the P068A code, follow these steps:

1. Connect an OBD-II scanner to your vehicle's diagnostic port and retrieve all stored codes and freeze frame data.
2. Clear the codes and test drive the vehicle to see if the P068A code returns.
3. If the code reappears, perform a visual inspection of all related wiring, connectors, and the battery.
4. Check the battery voltage to ensure it's within the proper range (typically 12.6V when the engine is off).
5. Locate and inspect the PCM power relay. It's usually found in the main fuse box under the hood.
6. Test the PCM power relay using a multimeter or by swapping it with a known good relay of the same type.
7. Inspect all fuses related to the ECM/PCM and replace any that are blown.
8. Use a wiring diagram to check the continuity of the circuits between the PCM, the power relay, and the battery.
9. If all previous steps check out, consider having the PCM tested or replaced by a professional.

Warning: Always disconnect the battery before working on electrical components to avoid short circuits or electrical shock.

Solutions for P068A Code

Depending on the root cause identified during diagnosis, here are some potential solutions:

1. Replacing the PCM Power Relay

If the relay is found to be faulty, replacing it is often the simplest solution.

• Locate the relay in the fuse box (consult your vehicle's manual for the exact location)
• Remove the old relay and insert the new one, ensuring it's the correct type and properly seated
• Clear the code and test drive to confirm the issue is resolved

Estimated cost: $20 - $50 for the relay, plus labor if not done yourself.

2. Repairing Wiring Issues

If damaged wiring is the culprit, you'll need to repair or replace the affected wires.

• Identify the damaged section of wiring
• Cut out the damaged portion and splice in new wire of the same gauge
• Use heat-shrink tubing or electrical tape to insulate the repair
• Secure the repaired wiring to prevent future damage

Estimated cost: $10 - $30 for materials if done yourself, $100 - $300 if professional repair is needed.

3. Replacing Blown Fuses

If a blown fuse is causing the issue, replacing it is a quick and inexpensive fix.

• Locate the blown fuse using your vehicle's fuse diagram
• Remove the old fuse and replace it with a new one of the same amperage
• Check for any underlying issues that may have caused the fuse to blow

Estimated cost: $5 - $10 for a pack of fuses.

4. Addressing Battery Issues

If low battery voltage is contributing to the problem, you may need to replace the battery or repair the charging system.

• Test the battery voltage and replace if it's below 12.4V when fully charged
• Check the alternator output and replace if it's not charging properly
• Inspect and clean battery terminals to ensure good connections

Estimated cost: $100 - $200 for a new battery, $200 - $500 for alternator replacement.

5. PCM Replacement

In rare cases, the PCM itself may be faulty and require replacement. This is typically a last resort after all other potential causes have been ruled out.

Warning: PCM replacement should only be done by a qualified professional, as it often requires programming and calibration specific to your vehicle.

Estimated cost: $500 - $2000, depending on the vehicle make and model.

Preventing Future P068A Codes

To reduce the likelihood of encountering the P068A code in the future:

1. Regularly inspect and clean battery terminals to ensure good electrical connections.
2. Avoid disconnecting the battery while the engine is running or immediately after shutting it off.
3. Address any electrical issues promptly to prevent damage to the PCM or other components.
4. Use high-quality replacement parts when servicing your vehicle's electrical system.
5. Consider having your vehicle's electrical system inspected annually by a professional.

When to Seek Professional Help

While many aspects of diagnosing and repairing a P068A code can be done by DIY mechanics, there are situations where professional help is recommended:

• If you're uncomfortable working with electrical systems
• When specialized diagnostic equipment is required
• If the code persists after attempting the above solutions
• When PCM replacement or reprogramming is necessary

Remember, misdiagnosing or improperly repairing electrical issues can lead to more severe and costly problems down the line.

In conclusion, the P068A code, while not as common as some other DTCs, can indicate serious issues with your vehicle's electrical system or engine control module. By understanding the causes, symptoms, and potential solutions, you can approach the problem methodically and resolve it efficiently. Always prioritize safety when working on your vehicle, and don't hesitate to seek professional assistance when needed.

Frequently Asked Questions About P068A

• Can I drive my car with a P068A code?
  While possible, it's not recommended. The code indicates an electrical issue that could lead to engine stalling or failure to start.
• How urgent is it to fix a P068A code?
  It's relatively urgent. The code suggests a problem with the PCM's power supply, which could affect various engine functions and potentially leave you stranded.
• Will a P068A code clear itself?
  It's unlikely. The code indicates a persistent problem that typically requires diagnosis and repair to resolve.
• Can a bad battery cause a P068A code?
  Yes, a weak or failing battery can contribute to this code by causing voltage fluctuations that affect the PCM power relay.
• How much does it typically cost to fix a P068A code?
  Costs can vary widely, from $50 for a simple relay replacement to over $1000 if PCM replacement is necessary. An average repair might cost $200-$500.
• Can I replace a PCM power relay myself?
  Yes, in most cases. The relay is usually located in an accessible fuse box, making it a relatively simple DIY repair.
• How long does it take to diagnose and fix a P068A code?
  Diagnosis typically takes 1-2 hours. Repair time varies based on the cause, from 30 minutes for a relay replacement to several hours for wiring repairs or PCM replacement.
• Is the P068A code covered under warranty?
  It depends on your vehicle's age, mileage, and specific warranty terms. Many manufacturers cover PCM-related issues under powertrain warranties.