P0931 OBD-II Trouble Code: Gear Shift Lock Solenoid Circuit High

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0931 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0931 code

P0931 is a diagnostic trouble code (DTC) for "Gear Shift Lock Solenoid Circuit High". 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 for $69.99. 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.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$69.99$20.00
Toyota$69.99$20.00
BMW$69.99$20.00
SCHEDULE P0931 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0931 code definition

The P0931 trouble code detects an issue with the gear shift lock solenoid circuit.

What the P0931 code means

The P0931 code is a generic OBD-II trouble code that notes a voltage reading problem with the gear shift lock solenoid circuit. The gear shift lock solenoid is responsible for making sure that the automatic transmission is unable to move out of the Park position unless the brake pedal is deployed. When the system detects that the brake pedal has been pressed, the gear shift lock solenoid allows the shifter to move from Park into Drive or Reverse. If the powertrain control module (PCM) detects that the voltage reading from the gear shift lock solenoid circuit is abnormally high, then the P0931 code will be stored.

What causes the P0931 code?

A few different things can cause the P0931 trouble code to be triggered:

  • Defective gear shift lock solenoid
  • Defective brake light switch
  • Low battery voltage
  • In rare cases, a defective PCM
  • Damaged electrical components in the circuit, such as wires and connectors

What are the symptoms of the P0931 code?

The P0931 trouble code will usually be accompanied by the Check Engine Light illuminating on the vehicle’s dashboard. The gear shifter will almost always be stuck in Park, so the car cannot be put in gear.

How does a mechanic diagnose the P0931 code?

The P0931 code will be diagnosed using a standard OBD-II trouble code scanner. A trained technician will observe the freeze frame data from the scanner to gather information about the code, and to see if any other trouble codes are present. If multiple different codes are detected, then they should be taken care of in the order that they appear in. The mechanic will then need to clear the trouble codes and restart the vehicle, to see if the P0931 code is still detected. If it is not, then it was either triggered erroneously, or represents an intermittent error.

If the code does remain following the reset, the mechanic will begin with a visual inspection of the system’s electrical components. Any loose or corroded connectors, or open or shorted wires will need to be replaced. The battery should then be checked to make sure that it is properly charged.

Next, the gear shift lock solenoid should be inspected, and tested for continuity. This is the most likely culprit of the P0931 code, but if the solenoid appears to be in working order, then the brake light switch will need to be checked.

After any replacement, the mechanic should pause the inspection and reset the trouble codes and restart the vehicle, to see if the code returns. By doing this, the technician will know as soon as the P0931 code has been resolved.

Common mistakes when diagnosing the P0931 code

The most commonly made mistake when diagnosing the P0931 code is the failure to properly follow the OBD-II trouble code diagnosis protocol. It’s very important that the protocol be followed, as it helps mechanics avoid erroneous repairs. For instance, it is common for the solenoid to be assumed defective, which risks overlooking damaged electrical components and replacing a functioning piece.

How serious is the P0931 code?

A car with the P0931 trouble code will probably not be drivable, because in most cases the vehicle will not be able to shift out of Park. The vehicle will likely require an inspection and repair before it can be driven.

What repairs can fix the P0931 code?

Common fixes for the P0931 trouble code are:

Additional comments for consideration regarding the P0931 code

The P0931 trouble code only applies to vehicles with automatic transmissions. If the car is stuck somewhere and needs to be moved, most transmissions have a fail-safe mechanism built into the shifter, which can be activated with a screwdriver.

Need help with a P0931 code?

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.

trouble codes
Check Engine Light
P0931

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0931 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

4,240

Rating Summary
3,884
174
45
26
111
3,884
174
45
26
111
Carzell

Carzell

15 years of experience
40 reviews
Carzell
15 years of experience
he was very knowledgeable and very friendly and courteous he answered every question I had to ask very thoroughly. will recommend him to all of my friends and family
2005 DODGE MAGNUM - CHECK ENGINE LIGHT IS ON INSPECTION - MEMPHIS, TENNESSEE
Jeffrey

Jeffrey

24 years of experience
683 reviews
Jeffrey
24 years of experience
Jeffrey made this experience so worth it. He was knowledgable and understanding. Im so glad he was chosen as my mechanic.
2009 HONDA CIVIC - CHECK ENGINE LIGHT IS ON - ROCK HILL, SOUTH CAROLINA
Theodore

Theodore

13 years of experience
814 reviews
Theodore
13 years of experience
We were very happy with Theodore's service. Our van had a slightly different oil pan plug than normal (from the last oil change), which made the oil plug gasket we bought not work, but Theodore had a even better part in his truck. Theodore obviously has a lot of experience, and was able to give us good advice on what to do about a couple of things in the car that might/might not need further fixing. I was concerned about the "generic" level of the parts that were going to be supplied in the Yourmechanic quote, but Theodore mentioned that we can upgrade those parts as needed. He sounds very flexible, as does the Yourmechanic platform. He was able to schedule me for an appointment to replace an EGR solenoid in about 30 seconds, from his phone. (We knew we needed something like this when we scheduled this inspection.) You can tell from his comments that his highest concern is getting the job done right (as opposed to doing it quick, or following some rigid standard of what should be done.)
1999 DODGE GRAND CARAVAN - CHECK ENGINE LIGHT IS ON - WOODINVILLE, WASHINGTON
Robert

Robert

17 years of experience
436 reviews
Robert
17 years of experience
Second time Robert has been out -- very knowledgeable and professional.
2004 TOYOTA MR2 SPYDER - CHECK ENGINE LIGHT IS ON - ERIE, COLORADO

More related articles

Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...

Related questions

Q: Saturn Ion wont change to 4th gear, its an automatic. The P0700 code comes up saying transaxal module. What does this means?

Hello. The code means there is either an electrical or mechanical (hydraulic) fault in the transmission, or the transmission "controls" and in your case that fault is causing your transmission not to shift. The fault itself can range from the...

Q: Car won't start keeps starting then cutting out its a new battery as well

Hello. This is most likely not a battery problem if the car cranks over and starts even if it dies shortly after. This is more likely an air/fuel supply issue. There is something called an idle air control module in...

Q: Having trouble with trouble code P0455.

Hi. Trouble code P0455 is for the emissions system of the car and the only effect it will have on the car is the fuel economy may go down slightly and the car will pollute the air a little more....

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com