The P0601 OBD-II code is a critical diagnostic trouble code that indicates an internal control module memory check sum error within the Powertrain Control Module (PCM). This code is urgent and signifies that the PCM is not functioning correctly due to issues with its memory.
What Does the P0601 Code Mean?
OBD-II Code P0601 is defined as an Internal Control Module Memory Check Sum Error. The PCM, which manages various essential functions in a vehicle, regularly runs self-diagnostic tests. When these tests reveal discrepancies in memory functions, the P0601 code is triggered, indicating potential failure of the PCM.
What Causes the P0601 Code?
Several factors can lead to the P0601 code being set, including:
- Lack of proper voltage to the PCM
- Defective PCM memory module
- Defective PCM ground circuit(s)
- Defective PCM controlled output devices
What Are the Symptoms of the P0601 Code?
A vehicle displaying the P0601 code may exhibit the following symptoms:
- Check Engine Light illumination
- Failure of emissions inspections due to OBD-II monitor issues
- ABS/Traction Control Light illumination
- Poor vehicle performance and shifting issues
- OBD-II Monitor ‘READY’ flags going to ‘NOT READY’ at ignition
- Decrease in fuel economy
- In some cases, no noticeable adverse conditions
- Potential performance problems like stalling or misfires
How Serious Is the P0601 Code?
The P0601 code is classified as urgent. Ignoring this code can lead to significant vehicle malfunctions, including severe damage to the PCM and other systems. Immediate action is necessary to prevent further complications.
How to Diagnose the P0601 Code
To diagnose the P0601 code, follow these steps:
- Use an OBD-II scanner to retrieve the P0601 code and any additional codes.
- Examine the freeze frame data for conditions present when the code was set.
- Perform a visual inspection of the PCM and its connections, ensuring there are no shorts or damage.
- Check the voltage supply to the PCM to ensure it is receiving a consistent 12 volts.
- Perform tests on the PCM memory modules to verify their functionality.
Common Repairs for the P0601 Code
Common repairs for the P0601 code may include:
- Replacing the PCM if it is determined to be defective
- Repairing or replacing faulty wiring or connectors
- Addressing issues with power supply to the PCM
- Fixing ground circuit problems affecting the PCM
How Much Does It Cost to Fix the P0601 Code?
The cost to repair issues related to the P0601 code can vary widely based on the underlying cause. Simple fixes like wiring repairs might cost less than $100, while replacing the PCM can range from $500 to over $1,500, depending on the make and model of the vehicle and labor costs.
Can I Fix the P0601 Code Myself?
While some aspects of diagnosing the P0601 code can be performed by a knowledgeable DIYer, such as checking for loose connections or damaged wiring, replacing a PCM often requires specialized tools and programming. Therefore, it is recommended to consult with a professional mechanic for repairs related to the P0601 code.
