Gear Shift Forward Actuator Circuit High
The P0923 code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the gear shift forward actuator circuit. This actuator is responsible for moving the shift mechanism into forward gears. A high voltage reading typically points to a short to power, a faulty actuator, or a wiring issue. This can prevent the transmission from engaging forward gears properly, leading to drivability concerns.
01. Most Common Causes
- Short to power in the actuator circuit wiring
- Faulty gear shift forward actuator
- Corroded or damaged connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Transmission stuck in neutral or park
- No forward movement when selecting Drive
- Check Engine Light illuminated
- Harsh or delayed engagement
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the actuator connector and wiring for damage, corrosion, or shorts.
Step 3: Using a multimeter, check for voltage at the actuator connector with the key on. Compare to manufacturer specs.
Step 4: Test the actuator resistance and operation per service manual.
Step 5: If wiring and actuator are good, check for PCM issues or perform a relearn procedure.
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 could shift unexpectedly, posing a safety risk. Have it towed to a repair shop.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. The actuator itself costs $50-$150, plus diagnostic time.