P0601 Internal Control Module Memory Check Sum Error
What does P0601 mean?
P0601 — Internal Control Module Memory Check Sum Error. This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects internal control module memory check sum error. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0601
- Internal PCM memory failure
- Failed PCM software update or corruption
- Voltage spikes damaging the PCM
- Low battery voltage during a write operation
- Hardware fault in the control module
How to fix P0601
- Verify battery voltage and charging system health first
- Check for PCM software update or TSBs from the vehicle maker
- Reprogram the PCM per the vehicle's procedure
- Replace the PCM if the error persists after reprogramming
- Ensure proper PCM power and grounds before replacement