OBD-II code · Network
U0601 Internal Control Module Software Incompatibility
A control module has detected that its own internal software version is inconsistent — for example a partial flash that left the module with mismatched calibration and program code. The module may go offline or operate in a fallback mode.
Is it safe to drive with U0601?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyIncomplete or interrupted module flash
- PossibleCorrupted calibration block
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Control Module
Related codes
- U0300Internal Control Module Software Incompatibility
- U05C0Invalid Data Received From Interior Lighting Control Module B
- U05C1Invalid Data Received From Active Radiator Air Flow Control Module A
- U0600Internal Control Module Memory Reset
- U0602Lost Communication With Particulate Filter Pressure Sensor B
- U0603Lost Communication With Fuel Pressure Sensor A
- U0604Lost Communication With Fuel Pressure Sensor B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.