U3012 code meaning
Control Module Improper Wake-up Performance
Network system Generic code U30xx codes Check engine light
What U3012 means
Some modules must wake themselves while the car is parked, for example to run engine-off tests or battery checks, and U3012 reports that this went wrong. Ford's 2023 diesel OBD summary describes the PCM monitor: the code sets if more than two wake-ups happen in the ten minutes before a scheduled alarm wake, or if a requested alarm wake is still missing ten minutes later. GM's 2016 Volt hybrid module checks at power-up whether a self wake-up requested at the last shutdown actually happened, Type A, one trip. In practice the cause is often software: Ford TSB 23-2077 reprograms PCM and TCM on 2022 Super Duty 6.7L trucks with MIL and U3012, and TSB 25-2245 reflashes the ABS module of 2025 F-150s storing U3012:68 with a soft pedal after start-up.
U3012 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U3012
- Check engine light on with no drivability concern
- ABS or brake warning and soft pedal right after start-up when the brake module stores it
Common causes of U3012
- Most likelyModule software handling timed wake-ups incorrectly
- PossibleAnother module or add-on keeping the network awake or waking it repeatedly
- PossibleBattery disconnected or supply lost while a wake-up was pending
- Less likelyFault in a hard-wired wake-up line or its connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Control moduleWakeup circuit
What each part of U3012 means
| U | Network system: communication between the control modules (CAN bus). |
| 3 | Reserved range, usually generic. |
| 12 | The exact fault in that area. |
What to do next
- Note U3012 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U3012
What does U3012 mean?
U3012 means "Control Module Improper Wake-up Performance". Some modules must wake themselves while the car is parked, for example to run engine-off tests or battery checks, and U3012 reports that this went wrong. It is a generic code, so it means the same on every make.
Is it safe to drive with U3012?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U3012 fail an emissions test?
Yes, it can. U3012 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U3012 to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. This is a job for a workshop.
Will U3012 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.