What Does P0929 Mean?
The TCM or PCM has detected that the gear shift lock solenoid/actuator control circuit A is operating outside its expected range or is not performing as commanded. The solenoid is receiving a signal but is not achieving the expected mechanical action in the correct timeframe or force. This can result in intermittent shifter lock behavior or sluggish shift lock release.
Common Causes
30%
Shift lock solenoid mechanically binding or partially stuck due to debris or wear
25%
High resistance in the solenoid circuit causing weak solenoid actuation
20%
Shift lock solenoid coil partially shorted, reducing electromagnetic force
15%
Mechanical obstruction in the shifter mechanism preventing full solenoid travel
10%
Worn or misaligned shifter interlock mechanism affecting solenoid engagement
Diagnostic Steps
1
Operate the shift lock solenoid manually (via scan tool actuation) while observing its physical movement; it should snap crisply and fully retract/extend.
2
Measure voltage at the solenoid connector while commanding it on; compare to battery voltage. Significant voltage drop indicates high circuit resistance.
3
Check the solenoid coil resistance and compare to specification; values outside the normal range indicate partial coil failure.
4
Inspect the shifter mechanism around the solenoid for debris, spilled drinks, or foreign objects that may impede solenoid travel.
5
Verify the shift lock mechanism alignment by manually cycling the shifter while observing the solenoid engagement point.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The TCM or PCM has detected that the gear shift lock solenoid/actuator control circuit A is operating outside its expected range or is not performing as commanded. The solenoid is receiving a signal but is not achieving the expected mechanical action in the correct timeframe or force. This can resul...
The most common cause of P0929 (Gear Shift Lock Solenoid/Actuator Control Circuit "A" Range/Performance) is: Shift lock solenoid mechanically binding or partially stuck due to debris or wear
Typical repair costs for P0929 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A poorly performing shift lock solenoid may allow the shifter to be moved from Park without fully depressing the brake, or it may intermittently prevent shifting out of Park, potentially stranding the driver in an unsafe location.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0929 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
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