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 transmission 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.
1. Symptoms You Will Notice
- Transmission stuck in neutral or park
- No forward movement when shifting into drive
- Check Engine Light illuminated
- Harsh or delayed shifting
2. Most Common Causes
- Short to power in the actuator circuit wiring
- Faulty gear shift forward actuator
- Corroded or damaged connector
- Failed PCM (rare)
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the actuator wiring and connector for damage, corrosion, or shorts.
Step 3: Test the actuator circuit voltage with a multimeter; compare to manufacturer specifications.
Step 4: If voltage is high, isolate the circuit to find the short; repair or replace wiring as needed.
Step 5: If wiring is okay, test the actuator resistance and replace if out of spec.
4. 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 shop.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for wiring repairs or actuator replacement, plus diagnostic fees.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.