The P0812 code in your 2020 Kia Stinger indicates a malfunction in the reverse input circuit. This circuit tells the TCM when reverse gear is selected, enabling backup lights, camera activation, and parking assistance features.
Understanding the Reverse Input Circuit
The Stinger's transmission includes a reverse gear position sensor or switch that signals when reverse is engaged. The TCM uses this input for safety features, backup camera activation, and transmission control strategies.
Common Causes of P0812
- Faulty reverse position switch
- Damaged wiring to the switch
- Corroded electrical connector
- TCM input circuit failure
- Internal transmission sensor issues
- Ground connection problems
Symptoms of Reverse Input Failure
- Backup lights not working
- Backup camera not activating
- Check engine light on
- Parking sensors inoperative in reverse
- TCM may not recognize reverse gear
- Possible reverse engagement issues
Stinger GT Features Affected
The Kia Stinger includes advanced driver assistance features that rely on reverse gear detection. P0812 can affect the backup camera, parking sensors, and collision warning systems.