Gear Shift Lock Solenoid/Actuator Control Circuit Range/Performance
The P0929 code indicates that the powertrain control module (PCM) has detected a range or performance issue in the gear shift lock solenoid/actuator control circuit. This solenoid prevents the shifter from moving out of Park unless the brake pedal is pressed. A fault in the circuit can cause the solenoid to malfunction, leading to an inability to shift out of Park or erratic shifting behavior.
1. Symptoms You Will Notice
- Unable to shift out of Park
- Shifter stuck in Park even with brake pedal pressed
- Brake lights not working
- Check Engine Light illuminated
2. Most Common Causes
- Faulty gear shift lock solenoid/actuator
- Open or shorted wiring in the control circuit
- Blown fuse or faulty relay
- Malfunctioning brake pedal position switch
- Corroded or loose electrical connectors
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check for related codes (e.g., brake switch codes).
Step 2: Inspect the brake pedal position switch for proper operation and adjustment.
Step 3: Visually inspect the wiring and connectors to the shift lock solenoid for damage, corrosion, or loose connections.
Step 4: Test the shift lock solenoid resistance and voltage supply using a multimeter.
Step 5: Check the fuse and relay for the shift lock system.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. If the shifter is stuck in Park, you cannot drive. Even if it shifts, the solenoid may fail unexpectedly, causing a safety hazard.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for parts and labor, depending on the cause. A solenoid replacement is usually under $100, while wiring repairs may cost more.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.