When you shift your vehicle into reverse, a series of sensors informs the computer which gear you have selected. It then powers an electric motor to move the transmission into that gear. A DTC P0926 is logged when the ECU detects an abnormally low voltage signal on the gear shift reverse actuator circuit.
How severe is the code?
The diagnostic code P0926 is quite serious, as these transmission issues can actually prevent you from shifting into reverse or cause reverse to disengage.
Symptoms
Symptoms of a P0926 include:
> Transmission begins to operate erratically
> It becomes difficult to shift into reverse or to stay in reverse
Causes
- Damage to wiring and/or connectors
- Faulty reverse actuator
- Faulty gear guide rail
- Faulty shift shaft
- Internal mechanical issues
- ECU/TCM problems or failure
How to diagnose the code?
The first step in diagnosing an OBDII P0926 fault code is to check all cables, connectors, fuses, and relays on this circuit. The gear shift reverse actuator will also need to be tested. The gear guide rail and shift shaft should also be inspected for any signs of damage and misalignment. If no issues are detected so far, further diagnostics of the transmission itself, as well as the ECU and TCM, must be performed.
What repairs will fix P0926?
- Repair or replace any damaged wiring or connectors
- Replace the gear shift reverse actuator
- Repair or replace the gear guide rail
- Repair or replace the shift shaft
- Repair internal mechanical faults
- Reprogram or replace the ECU/TCM
Related Codes
P0920 – Gear Shift Forward Actuator Circuit/Open
P0921 – Gear Shift Forward Actuator Circuit Range/Performance
P0922 – Gear Shift Forward Actuator Circuit Low
P0923 – Gear Shift Forward Actuator Circuit High
P0924 – Gear Shift Reverse Control Circuit/Open
P0925 – Gear Shift Reverse Actuator Circuit Range/Performance
P0927 – Gear Shift Reverse Actuator Circuit High