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.
Medium severity. Can I keep driving?It depends on which control module has dropped out. If it affects the engine, brakes, or steering, do not continue your trip: call for roadside assistance.
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
Most likely causes
- Incomplete or interrupted module flash
- Corrupted calibration block
- Gateway module routing CAN messages incorrectly
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
What each character of U0601 means
- U: Communication network
- 0: Generic code: same on every make
- 6: Subsystem depends on the code range
- 01: Specific fault in that system
Frequently asked questions
Can I keep driving with code U0601?
It depends on which control module has dropped out. If it affects the engine, brakes, or steering, do not continue your trip: call for roadside assistance.
What causes code U0601?
The most common causes are: incomplete or interrupted module flash; corrupted calibration block; gateway module routing CAN messages incorrectly.
Related codes
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.