A reverse input switch is responsible for activating the reverse lights when you put your shifter into reverse. If the ECU detects an unusual voltage signals coming from the switch, a P0812 DTC will be stored.
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What Transmission Do I Have?
How Serious is the Code?
A P0812 diagnostic trouble code isn’t really going to affect the performance of your vehicle. But it can affect the safety of your vehicle if the reverse lights stop working.
Symptoms
Symptoms of a P0812 include:
- Reverse lights stop working
Causes
- Damaged wiring/connectors
- Blown fuse
- Faulty reverse input switch
How to Diagnose the Code?
To diagnose a P0812 OBDII trouble code, the technician should start by inspecting the wiring and connectors. The reverse input switch itself should also be tested, along with the appropriate fuses and bulbs.
Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.
What Transmission Do I Have?
What Repairs Will Fix P0812?
- Repair/replace faulty wiring and/or connectors
- Replace reverse input switch
Related Codes
N/A
