Gear Shift Reverse Actuator Circuit High
The P0927 code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the gear shift reverse actuator circuit. This actuator is responsible for engaging reverse gear in automatic transmissions. A high voltage reading typically points to a short to power, a faulty actuator, or a wiring issue. This can prevent the transmission from shifting into reverse or cause erratic shifting behavior.
1. Symptoms You Will Notice
- Transmission fails to engage reverse gear
- Check Engine Light illuminated
- Transmission stuck in park or neutral
- Erratic shifting or delayed engagement
2. Most Common Causes
- Short to power in the reverse actuator circuit wiring
- Faulty gear shift reverse actuator
- Corroded or damaged connector at the actuator
- Failed PCM (rare)
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0927 and check for additional codes.
Step 2: Visually inspect the reverse 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 wiring is intact, test the actuator resistance and operation; replace if out of spec.
Step 5: Clear codes and test drive to verify repair.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may not shift into reverse, leaving you stranded. Driving with a transmission issue can cause further damage.
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 and labor fees.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.