P0812

Reverse Input Circuit

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$6–56 (est.)

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

P0800 P0801 P0802