U3031Ignition Output Off
- Generic OBD-II code · Network
- How the car detects it
- U3031 relates to an output whose task is to announce the off state, for example a discrete line that tells other units they may shut down, or the off branch of a power-mode output. Shutdown in many vehicles hinges on such a signal: in Ford's patent US5945745A, modules work normally while an ignition signal is present and fall back to a sleep mode with minimal current draw once it disappears, and GM's 2012 pickups allow the BCM to sleep only when none of its outputs is commanded. If the generating module finds this off output in the wrong state, it records U3031. Stuck in the not-off state, receivers stay awake and drain the battery; signalling off while driving could shut functions down on the move. No manufacturer documents U3031 publicly, so where this output sits has to be taken from the wiring diagram of the vehicle.
- What you may notice
- Battery drained because modules do not go to sleep
- Functions switching off unexpectedly with the vehicle on
- Likely causes
- PossibleFaulty output stage in the module that generates the off signal
- PossibleOff-signal wire open or shorted to ground or voltage
- RareCorroded or loose pin at the sending or receiving module
- RareModule software setting the off output at the wrong moment
- Repair
- Medium · Usually a job for a workshop.Typical cost: €30 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.