OBD-II code · Powertrain (generic)
P0813 Reverse Output Circuit
General electrical fault on the reverse-output circuit — the line that drives backup lights, reverse alarm or transfer-case reverse signal. With the output broken these consumers cannot be activated.
Is it safe to drive with P0813?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen or shorted output wire
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Reverse Output Circuit, Wiring Harness
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.