OBD-II Generic Error Code P0929: How to Fix It

Q: Can I still drive my car with a P0929 code?

In many cases the vehicle is still drivable, but you may experience difficulty shifting out of Park or the shifter may not lock back into Park properly. If the shifter is completely stuck in Park, the vehicle cannot be moved safely. Most vehicles have a manual shift lock override slot (usually near the shifter, covered by a small cap) that allows you to manually release the shifter in an emergency. Drive with caution and address the fault as soon as possible to avoid being stranded.

Q: What causes a P0929 code?

The most common causes are a failed or worn shift lock solenoid, damaged or corroded wiring and connectors in the solenoid circuit, a faulty brake pedal position (brake light) switch, a blown fuse in the shift interlock circuit, or in rare cases a PCM software or hardware fault. Rodent damage to wiring is also a surprisingly common culprit.

Q: How much does it cost to fix a P0929 error code?

If only the shift lock solenoid needs replacing, the part itself is typically inexpensive (often $20–$80 depending on the vehicle). Labor at a shop usually runs 1–2 hours, bringing the total to roughly $100–$250. If the wiring harness needs repair or the brake light switch is involved, costs can increase. Diagnosing and repairing a PCM-related fault can be significantly more expensive.

Q: Is P0929 the same as the shift interlock solenoid circuit malfunction code?

P0929 specifically refers to a range or performance problem with the gear shift lock solenoid, meaning the PCM detects that the solenoid is not responding as expected. Related codes include P0927 (solenoid circuit open), P0928 (solenoid circuit high), and P0930 (solenoid circuit low). A range/performance code means the signal exists but falls outside the expected parameters, rather than being completely absent.

Q: Will the P0929 code clear itself?

No — once the PCM sets a P0929 code it will remain stored until it is cleared with an OBD2 scanner, or in some vehicles after a set number of successful drive cycles with no fault detected. Simply disconnecting the battery will clear the code temporarily, but if the underlying problem is not fixed, the code will return quickly once the PCM performs its system checks.

Abstract

The P0929 trouble code indicates that your vehicle's gear shift lock solenoid is not performing within its expected range. This solenoid is responsible for locking or unlocking the gear shifter — typically preventing you from shifting out of Park without the brake pedal pressed. When the PCM (Powertrain Control Module) detects that the solenoid's signal or behavior is out of spec, it triggers this code, which can result in the shifter staying locked or failing to lock properly.