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, etc.) in automatic or automated manual transmissions. When the powertrain control module (PCM) detects an open circuit, it means there is a break in the electrical path, preventing the actuator from receiving power or ground. This can cause the transmission to fail to engage forward gears, leading to no movement or erratic shifting.
01. Most Common Causes
- Open or shorted wiring in the actuator circuit
- Faulty gear shift forward actuator
- Corroded or loose connector at the actuator
- Blown fuse or relay for the actuator circuit
- Failed PCM (rare)
02. Symptoms You Will Notice
- Transmission stuck in neutral or reverse
- No forward movement when selecting Drive
- Check Engine Light illuminated
- Transmission warning light on
- Erratic or delayed shifting
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the actuator connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the actuator circuit for continuity and voltage using a multimeter.
Step 4: Check the fuse and relay for the actuator circuit.
Step 5: If circuit is intact, test the actuator itself by applying power and ground directly.
Step 6: If actuator fails, replace it; if circuit is open, repair wiring.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may not move forward or may shift unexpectedly, posing a safety risk. Have it towed to a shop.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, but if the actuator needs replacement, parts and labor can range from $200-$500.