A P0820 DTC means that the computer has detected a situation where the selected gear does not match up with what the ECU thinks the vehicle is doing.
How Serious is the Code?
Although a P0820 diagnostic trouble code might not seem very important on the surface, it can affect the drivability of the vehicle if the ECU thinks that you have not selected the right gear.
Symptoms of a P0820 include:
- Harsh gear changes
- Failure to change gears
- Damaged wiring and/or connectors
- Transmission range sensor out of adjustment
- Failed transmission range sensor
How to Diagnose the Code?
Often times, a P0820 OBDII trouble code is caused by an electrical fault. So a diagnosis should begin with checking the condition of the wiring and connectors. After that, the transmission range sensor should be tested.
What Repairs Will Fix P0820?
- Repair or replace damaged wiring/connectors
- Adjust or replace transmission range sensor
- P0821 – Gear Lever X Position Circuit
P0822 – Gear Lever Y Position Circuit
P0823 – Gear Lever X Position Circuit Intermittent
P0824 – Gear Lever Y Position Circuit Intermittent