P0920 - Gear Shift Forward Actuator Circuit/Open
The P0920 code indicates an open or malfunction in the gear shift forward actuator circuit. This actuator is responsible for moving the transmission into forward gears (Drive, 1st, 2nd, etc.) in automatic or automated manual transmissions. An open circuit means there is a break in the electrical path, preventing the actuator from receiving power or ground signals. This can cause the transmission to fail to engage forward gears, potentially leaving the vehicle stuck in neutral or reverse.
1. Symptoms You Will Notice
- Transmission stuck in neutral or reverse
- Unable to shift into forward gears
- Check Engine Light illuminated
- Transmission warning light on dashboard
2. Most Common Causes
- Faulty gear shift forward actuator
- Open or shorted wiring in the actuator circuit
- Corroded or damaged connector
- Failed transmission control module (TCM)
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Visually inspect the actuator connector and wiring for damage, corrosion, or loose connections.
Step 3: Use a multimeter to test the actuator circuit for continuity and proper voltage (typically 12V with ignition on).
Step 4: If circuit is open, repair wiring or replace actuator as needed; if circuit is intact, test actuator resistance and compare to specs.
Step 5: If actuator and wiring are good, suspect TCM failure and perform further diagnostics.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may not engage forward gears, leaving you stranded or causing a dangerous situation if the transmission unexpectedly fails while driving.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, but can be higher if the actuator or TCM needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.