OBD-II code · Network (extended)
U3012 Control Module Improper Wake-up Performance
The control module did not wake up cleanly from sleep mode — wake event timing or sequence outside spec.
Is it safe to drive with U3012?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyModule internal fault
- PossibleWake signal noise or glitch
- 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
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Control Module, Wakeup Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.