Most often found on vehicles with dual clutch transmissions and automatic transmissions, a P2790 DTC indicates that the ECU thinks the selected gear range is inappropriate for the current operating parameters of the vehicle.
How Serious is the Code?
A P2790 diagnostic trouble code is fairly serious, and transmission problems like harsh shifts, slipping and limp mode may impact the drivability of the vehicle. The cause can range from a failed sensor to a shorted wire or corroded connector.
Symptoms of a P2790 include:
- Harsh shifts
- Delayed shifts
- Failed gear engagement
- Poor performance
- Limp Mode
- Damaged wiring/connectors
- Failed shifter assembly
- Failed/misadjusted transmission range sensor
How to Diagnose the Code?
The first step to diagnosing a P2790 OBDII trouble code, should be to inspect the wiring and connectors on the transmission wiring harness. The shifter assembly itself may need to be inspected, along with the transmission range sensor.
What Repairs Will Fix P2790?
- Repair/replace damaged wiring or connectors
- Replace shifter assembly
- Adjust or replace transmission range sensor