The P2791 DTC usually gets stored when the ECU thinks that the incorrect gear has been selected, based on what it sees the vehicle doing through various speed sensors, solenoid’s etc.
What Transmission Do I Have?
How Serious is the Code?
Basically, a P2791 diagnostic trouble code means the ECU thinks the wrong gear has been selected with the shifter. This can cause the computer to affect or reduce the vehicle performance in an effort to protect the transmission (sometimes called limp mode). So the cause will need to be determined fairly quickly.
Symptoms
Symptoms of a P2791 include:
- Unusually harsh shifts
- Slipping
- Delayed gear changes
- Failed gear engagement
- Poor performance
- Limp Mode
Causes
- Damaged wiring/connectors
- Failed shifter assembly or components
- Failed/misadjusted transmission range sensor
How to Diagnose the Code?
When diagnosing a P2791 OBDII trouble code, it’s important to carefully inspect the wires and connectors on the transmission wiring harness and shifter. This shifter itself may need to be checked to ensure that it operates properly, along with the transmission range sensor.
What Transmission Do I Have?
What Repairs Will Fix P2791?
- Repair/replace damaged wiring or connectors
- Replace shifter assembly
- Adjust or replace transmission range sensor
Related Codes
N/A
