P0812
Reverse Input Circuit
P0812 is an OBD-II diagnostic trouble code meaning: Reverse Input Circuit. Common causes: open or short circuit in reverse circuit, transmission position sensor malfunction. Estimated repair cost: $6–56.
Symptoms
- Check Engine Light Is On
- Incorrect engine operation when reverse gear is engaged
- No signal on the instrument panel when reverse gear is engaged
- Gear shifting problems (on some models)
Causes
- Open or short circuit in reverse circuit
- Transmission position sensor malfunction
- Reverse switch damage
- Oxidation or poor contact in connectors
- ECU problems (rare)
How to Fix
- Check the integrity of the reverse circuit
- Check the condition of the gearbox position sensor
- Inspect the reverse switch
- Clean contacts in circuit connectors
- If necessary, replace faulty components
Related codes
Error P0812 by Vehicle Brand
FAQ
What does the P0812 code mean?
P0812 is an OBD-II diagnostic trouble code that indicates: Reverse Input Circuit
What causes a P0812 error code?
The most common causes of P0812 include: Open or short circuit in reverse circuit; Transmission position sensor malfunction; Reverse switch damage; Oxidation or poor contact in connectors.
How do I fix a P0812 diagnostic trouble code?
To fix P0812: Check the integrity of the reverse circuit. Check the condition of the gearbox position sensor. Inspect the reverse switch. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0812?
Yes, but get it checked soon
How much does it cost to fix P0812?
The estimated repair cost for P0812 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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