What Does P0931 Mean?
The TCM or PCM has detected a higher-than-expected voltage on the gear shift lock solenoid/actuator control circuit A. This indicates the primary shift lock circuit has a voltage source feeding it that the control module did not command. This can cause the solenoid to remain continuously energized or prevent the control module from properly controlling the shift lock engagement and release timing.
Common Causes
30%
Short to battery voltage in circuit A wiring
25%
Relay for shift lock solenoid A stuck in the closed position
20%
Wiring harness chafed against a power feed in the steering column or console area
15%
Faulty control module with shorted high-side output driver
10%
Aftermarket equipment improperly wired to the shift lock circuit
Diagnostic Steps
1
Disconnect the shift lock solenoid A connector and measure voltage on the circuit A wire; battery voltage present with the solenoid disconnected confirms a wiring-side short to power.
2
Trace the circuit A wiring through the steering column and center console for chafing against ignition switch wiring or other power circuits.
3
If the circuit uses a relay, remove and test it for welded or stuck contacts; replace if defective.
4
Inspect for any aftermarket installations (remote start, security systems) that may have tapped into the shift lock wiring.
5
If no external short is found, test the control module by disconnecting it and checking for voltage on the output pin; voltage present indicates a module-side issue.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The TCM or PCM has detected a higher-than-expected voltage on the gear shift lock solenoid/actuator control circuit A. This indicates the primary shift lock circuit has a voltage source feeding it that the control module did not command. This can cause the solenoid to remain continuously energized o...
The most common cause of P0931 (Gear Shift Lock Solenoid/Actuator Control Circuit "A" High) is: Short to battery voltage in circuit A wiring
Typical repair costs for P0931 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
An always-high voltage on the primary shift lock circuit can cause the solenoid to overheat, or it may prevent proper interlock sequencing. This can result in the shift lock not engaging when the vehicle is placed in Park, allowing unintended shifter movement.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0931 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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