What Transmission Do I Have?
The gate select position sensor/GSP sensor is responsible for telling the ECU and TCM what gear the driver has selected. If there is an issue with this important transmission sensor, a P0904 DTC will be triggered.
How Serious is the Code?
When a P0904 diagnostic trouble code is present, a number of serious drivability issues can occur, including erratic transmission behavior and engine stalling.
Symptoms
Symptoms of a P0904 include:
- Engine will not start
- Erratic shifting
- Harsh or delayed shifts
- Transmission seems to skip gears
- Cruise control stops working correctly
Causes
- Misaligned gate select position sensor
- Shift linkage mis-adjustment
- Failed gate select position sensor
How to Diagnose the Code?
The first step to diagnosing a P0904 OBDII trouble code, is to check to the alignment of the gate select position sensor. The shift linkage itself may also need to be examined.
What Repairs Will Fix P0904?
- Adjust gate selection position sensor
- Adjust shift linkage
- Replace GSP sensor
Related Codes
- P0905 – Gate Select Position Circuit Range/Performance
- P0906 – Gate Select Position Circuit Low
- P0907 – Gate Select Position Circuit High
- P0908 – Gate Select Position Circuit Intermittent