P0601 — Internal Control Module Memory Check Sum Error
High severityWhat it means
P0601 is stored when the engine control unit sees a fault involving the control module's internal memory. This code means the control module failed an internal memory (checksum) self-test, which can make its decisions unreliable. The fault points to the module's internal operation or its power, ground and network connections rather than a single external sensor.
Common symptoms
- Multiple warning lights
- Poor running or no-start
- Modules failing to respond
Likely causes
- Low voltage, poor ground or a corroded connector at the module
- Low system voltage or a poor ground corrupting memory
- Internal control-module failure
What to check first
- Verify module power, grounds and battery voltage before suspecting the module itself
- Check power, ground and battery voltage to the module first
- Verify the module software is up to date before replacing it
Can you keep driving?
An unreliable control module can affect running and safety functions; have it diagnosed promptly.
Frequently asked questions
What is the most common cause of P0601?
The most likely cause is: Low voltage, poor ground or a corroded connector at the module. Several other faults can set P0601 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P0601 and keep driving?
Clearing P0601 with an OBD2 scanner turns the warning light off, but if the underlying fault has not been repaired the code will usually come back within a few drive cycles. Fix the cause first, then clear the code to confirm the repair worked.
How serious is P0601?
P0601 is a high-severity code. Diagnose and repair it as soon as possible, because continuing to drive can cause further damage or leave you stranded.
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