Gear Shift Lock Solenoid/Actuator Control Circuit Open
The P0928 code indicates an open circuit 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. An open circuit means there is a break in the electrical path, which can disable the shift lock function, making it difficult or impossible to shift out of Park.
1. Symptoms You Will Notice
- Unable to shift out of Park without using shift lock override
- Brake pedal feels normal but shifter remains locked
- Check Engine Light or transmission warning light illuminated
- Intermittent shifting issues
2. Most Common Causes
- Blown fuse for the shift lock solenoid circuit
- Faulty shift lock solenoid/actuator
- Open or shorted wiring in the solenoid control circuit
- Faulty brake pedal position switch
- Faulty body control module (BCM) or transmission control module (TCM)
3. Step-by-Step Diagnosis
Step 1: Check for blown fuses related to the shift lock solenoid circuit.
Step 2: Inspect wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the shift lock solenoid resistance and power/ground signals using a multimeter.
Step 4: Verify brake pedal position switch operation and signal to the solenoid.
Step 5: If all else is good, test the control module outputs or consult a professional.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not safe to drive if you cannot shift out of Park. Use the shift lock override to move the shifter, but have the issue repaired promptly to avoid being stranded.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the cause. A solenoid replacement may cost around $100, while wiring repairs could be less.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.