Gear Shift Reverse Actuator Circuit High Voltage
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 the 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.
01. Most Common Causes
- Short to power in the actuator circuit wiring
- Faulty gear shift reverse actuator
- Corroded or damaged connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Transmission stuck in park or neutral
- Reverse gear not engaging
- Check Engine Light illuminated
- Transmission warning light on
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the actuator wiring and connector for damage, corrosion, or shorts.
Step 3: Using a multimeter, check the actuator circuit voltage against manufacturer specs (typically 5V reference).
Step 4: Test the actuator resistance and operation with a scan tool or direct power/ground.
Step 5: If wiring and actuator are good, suspect PCM issue and perform further diagnostics.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe to drive because the vehicle may not shift into reverse, or the transmission could behave unpredictably, increasing the risk of an accident.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. The actuator itself costs $50-$150, and labor adds $100-$250 depending on the vehicle.