The P0921 trouble code relates to the gear shift forward actuator circuit, indicating a range or performance issue.
P0921 Gear Shift Forward Actuator Circuit Range/Performance
Code symptoms P0921.
1. Difficulty shifting gears into forward.
2. Gear selector not responding as expected when shifting into forward.
3. Transmission may not engage properly into forward.
4. The Check Engine Light (CEL) may be illuminated.
Causes of the code P0921.
1. Faulty gear shift forward actuator.
2. Wiring or connector issues in the gear shift forward actuator circuit.
3. Mechanical issues with the transmission system.
Code Solutions P0921.
1. Test and replace the gear shift forward actuator if it is faulty.
2. Inspect the wiring and connectors in the gear shift forward actuator circuit for any damage, corrosion, or loose connections. Repair or replace any damaged wiring or connectors.
3. Check for any mechanical issues with the transmission system, such as worn components or fluid issues.