When you shift your vehicle into reverse, a series of sensors tells the computer what gear you have selected. It then energizes an electric motor to shift the transmission into that gear. A P0926 DTC gets saved when the ECU takes an unusually low voltage signal on the gearshift reverse actuator circuit.
How Serious is the Code?
The P0926 diagnostic trouble code is fairly serious, because these transmission problems can actually prevent you from shifting into or out of reverse.
Symptoms of a P0926 include:
- Transmission begins to operate erratically
- It becomes difficult to shift into or out of reverse
- Damage to the wiring and/or connectors
- Faulty gearshift reverse actuator
- Faulty gear guide rail
- faulty shift shaft
- Internal mechanical issues
- ECU/TCM issues or failure
How to Diagnose the Code?
The first step to diagnosing a P0926 OBDII trouble code, is checking all the wiring, connectors, fuses and relays on this circuit. The gearshift reverse actuator will also need to be tested. The gear guide rail and shift shaft should also be inspected for signs of damage and misalignment. Should no problems be found up to this point, further diagnosis of the transmission itself, along with the ECU and TCM should be performed.
What Repairs Will Fix P0926?
- Repair or replace any damage wiring or connectors
- Replace gearshift reverse actuator
- Repair or replace gear guide rail
- Repair or replace shift shaft
- Repair internal mechanical fault(s)
- Reprogram or replace ECU/TCM
- 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 Actuator Circuit/Open
- P0925 – Gear Shift Reverse Actuator Circuit Range/Performance
- P0927 – Gear Shift Reverse Actuator Circuit High