P0813Reverse Output Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- P0813 concerns a signal 'reverse active' that a module puts out – usually the transmission module, on manual cars the engine or body module – for example to the back-up lamp relay, the reversing camera or the body module. Like other driver outputs it is checked by comparing commanded and actual state, which reveals an open circuit or a short. Saab's 2012 transmission module reports a short to positive on its park/neutral output in the same way. No manufacturer document with thresholds for the reverse output is available to us. Back-up lamps, camera or mirror tilt may stop working; driving itself is not affected, and CARB allows such outputs without the MIL.
- What you may notice
- Back-up lamps not working
- Reversing camera or parking beeper does not activate
- Stored code without driving effects
- Likely causes
- LikelyWire from module to relay or body module open or shorted
- PossibleBack-up lamp relay or connected load faulty
- PossibleConnector corroded
- RareModule output stage faulty
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.