The ECU and TCM rely on the gate select position sensor to tell them which gear has been selected with the shift lever. Without this data, they will not be able to determine the timing of the gear shift and whether or not the engine should even be allowed to start. So, if there is a low voltage signal on the GSP sensor circuit, a DTC P0906 will be recorded in the ECU’s memory.
How severe is the code?
A diagnostic code P0906 is actually quite severe, which can lead to a number of transmission problems, including delayed shifts and unusually hard shifts. The computer may also think that the transmission is still engaged, which will prevent the engine from starting.
Symptoms
Symptoms of a P0906 include:
- Engine does not start
- Erratic transmission behavior
- Delayed gear changes
- Harsh shifting
- Cruise control no longer works correctly
Causes
- Misaligned gate select position sensor
- Shift linkage needs adjustment
- GSP sensor is faulty
How to diagnose the code?
The first thing to do when trying to figure out what is causing a P0906 OBDII fault code is to check the adjustment of the gate select position sensor. If it is misaligned, this code will be triggered. Improperly adjusted shift linkages can also trigger this OBD2 code.
What repairs will fix P0906?
- Adjust the gate select position sensor
- Adjust the shift linkage
- Replace the GSP sensor
Related Codes
P0904 – Gate Select Position Circuit
P0905 – Gate Select Position Circuit Range/Performance
P0907 – Gate Select Position Circuit High
P0908 – Gate Select Position Circuit Intermittent