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P0929 is a diagnostic trouble code (DTC) for "Gear Shift Lock Solenoid Circuit Range/Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0929 code is a generic powertrain code related to the transmission, including pressure faults and sensor failures. In this case, the transmission control module has detected a fault with the gear shift lock solenoid circuit.
A vehicle with an automatic transmission uses the gear shift lock solenoid to ensure that your vehicle cannot be shifted out of “Park” without the brake pedal being depressed. When the vehicle engine is “on” and the brake pedal is fully depressed, the gear shift lock solenoid allows the vehicle to shift from “Park” to “Reverse” or “Drive.”
When the engine control module (ECM) detects an abnormal voltage reading or signal from the gear shift lock solenoid, a code P0929 can be stored.
Several problems may cause a P0929 code including:
Symptoms of a P0929 code may include:
A mechanic may use several methods to diagnose a P0929 trouble code, including:
One common cause of a P0929 trouble code is a faulty brake light switch, which will not allow the vehicle to move out of park. The fuse that controls the brake light switch and shift lock may have blown, and should be diagnosed before performing further repairs or replacements.
Because a vehicle’s safe driving operation most likely will be impacted due to faults that store a P0929 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.
Several repairs can fix a P0929 trouble code and include:
Note, an automatic transmission will have a “shift lock” feature, which can allow the drive to temporarily bypass a locked gear shift solenoid, and allow you to shift into drive to move your vehicle to a mechanic or out of a potentially dangerous location.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.