Network
generic or reserved
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.
SystemNetwork
Typegeneric or reserved
GroupU3
Range / number– / 12
Possible causes
- Module internal fault high
- Wake signal noise or glitch medium
- Gateway module routing CAN messages incorrectly low
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
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–1500 €
- Estimated time: 1–5 h
- Component: control module
- Component: wakeup circuit
- MIL / check engine light
Sources
References
sae:J2012