OBD-II Code P0605 is defined as an Internal Control Module Read Only Memory (ROM) Error. This code indicates that the engine control module (PCM) is not passing its routine self-test for the ROM section, which is critical for the operation of the vehicle.
What Does the P0605 Code Mean?
The P0605 code signifies a malfunction within the PCM’s Read Only Memory (ROM). The PCM performs essential functions, including managing the fuel and ignition systems, transmission controls, and various safety systems like Anti-Lock Brakes. When the PCM detects an issue during its self-diagnostic tests, it triggers the P0605 code.
What Causes the P0605 Code?
Several factors can trigger the P0605 code, including:
- Lack of proper voltage and/or ground to the PCM
- Defective PCM ROM memory module
- Defective PCM ground circuits
- Defective PCM controlled output devices
What Are the Symptoms of the P0605 Code?
The symptoms associated with a P0605 code can vary, but they often include:
- Check Engine Light illumination
- Emissions Inspection failure
- ABS/Traction Control Light may illuminate
- Vehicle may not perform and/or shift properly
- Decrease in fuel economy
- In unusual cases, no noticeable adverse conditions
- Performance issues, such as stalling when coming to a stop or misfire-like symptoms
How Serious Is the P0605 Code?
The P0605 code is categorized as urgent, indicating that immediate action is necessary. Ignoring this code can lead to severe damage to the vehicle or pose safety risks to the driver and passengers. Therefore, it is essential to address this issue promptly.
How to Diagnose the P0605 Code
Diagnosing the P0605 code involves several steps:
- Record any other trouble codes and the P0605 freeze frame data.
- Duplicate the code setting conditions through a test drive.
- Monitor engine load, throttle position, RPM, and road speed.
- Check for consistent 12-volt power and ground signals to the PCM.
- Examine for shorted output devices that could affect the PCM’s memory functions.
Common Repairs for the P0605 Code
Common repairs for the P0605 code include:
- Repairing or replacing faulty wiring or connectors leading to the PCM
- Replacing the defective PCM ROM memory module
- Repairing defective PCM ground circuits
- Replacing the PCM, if necessary, after confirming the root cause
How Much Does It Cost to Fix the P0605 Code?
The cost to fix the P0605 code can vary widely, depending on the underlying cause. Basic repairs, like fixing wiring issues, could range from $100 to $300. However, if the PCM needs replacement, costs can escalate to $800 or more, including parts and labor.
Can I Fix the P0605 Code Myself?
While some aspects of diagnosing and fixing the P0605 code can be done by a knowledgeable DIYer, caution is advised. Proper diagnosis is critical, as misdiagnosing the issue could lead to unnecessary expenses. If you’re not confident in your ability to troubleshoot electrical systems or PCM issues, it’s best to seek professional assistance.
