What Does P0928 Mean?
The TCM or PCM has detected an open circuit in the gear shift lock solenoid/actuator control circuit A. The shift lock solenoid prevents the gear selector from being moved out of Park unless the brake pedal is depressed (or other safety conditions are met). An open circuit means the solenoid cannot be energized, which may either lock the shifter permanently in Park or disable the safety interlock entirely.
Common Causes
30%
Broken wire or disconnected connector in the shift lock solenoid circuit A
30%
Failed shift lock solenoid with an open internal coil
20%
Corroded connector at the shift lock solenoid or TCM
10%
Blown fuse in the shift lock solenoid power circuit
10%
Faulty TCM shift lock driver circuit
Diagnostic Steps
1
Check the fuse for the shift lock solenoid circuit; a blown fuse is the simplest cause and should be ruled out first.
2
Locate the shift lock solenoid on or near the shifter assembly and inspect its electrical connector for damage, corrosion, or disconnection.
3
Measure the resistance of the shift lock solenoid coil with an ohmmeter; an open reading confirms solenoid failure and the need for replacement.
4
Check wiring continuity between the TCM connector and the shift lock solenoid connector; repair any open circuits.
5
If the solenoid and wiring are intact, command the shift lock solenoid on and off via scan tool while monitoring voltage at the solenoid to verify TCM output.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The TCM or PCM has detected an open circuit in the gear shift lock solenoid/actuator control circuit A. The shift lock solenoid prevents the gear selector from being moved out of Park unless the brake pedal is depressed (or other safety conditions are met). An open circuit means the solenoid cannot ...
The most common cause of P0928 (Gear Shift Lock Solenoid/Actuator Control Circuit "A"/Open) is: Broken wire or disconnected connector in the shift lock solenoid circuit A
Typical repair costs for P0928 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
If the shift lock solenoid fails energized (locked), the driver may be unable to shift out of Park, stranding the vehicle. If it fails de-energized or the interlock is bypassed, the vehicle could be shifted out of Park without the brake applied, risking unintended rollaway.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0928 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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