Skip the auto shop - Our mechanics make house calls

P0631 OBD-II Trouble Code: VIN Not Programmed or Incompatible – TCM

check engine light

P0631 code definition

A P0631 refers to the transmission control module's failure to recognize the vehicle's identification number.

What the P0631 code means

The P0631 indicates that your vehicle's transmission control module has been unable to register its own identification number. Although this may be the result of faulty components, it's most often the cause of an improperly programmed command module.

What causes the P0631 code?

If the vehicle's Powertrain Control Module (PCM) has been replaced, the connected modules will need to be reprogrammed accordingly. If this does not occur, it may result in a debilitating P0631 instance. If the PCM has been damaged or left unpowered for a long enough time, it may lose its memory and require programming. PCM and transmission control module-related wiring may also be a cause for this issue.

What are the symptoms of the P0631 code?

A P0631 trouble code will typically result in the vehicle's inability to start. Although it is a relatively simple and rare malfunction, the vehicle will be completely disabled until such a time where the problem has been solved. In any case, the vehicle computer will store a P0631 OBD-II code for diagnostic purposes and the dashboard light will be illuminated.

How does a mechanic diagnose the P0631 code?

A mechanic may first diagnose the trouble code by hooking up an OBD-II code reader to the vehicle's onboard computer. All of the system-related wiring and connectors should be inspected thoroughly for signs of damage or corrosion.

Common mistakes when diagnosing the P0631 code

If any modules require replacing in order to solve a P0631 code, they may require reprogramming after the fact. Besides that, due to the relative rarity and simplicity of the P0631, there have been few reported instances of misdiagnosing the issue.

How serious is the P0631 code?

Although a P0631 is usually simple to solve, the problem will likely result in the vehicle's failure to start.

What repairs can fix the P0631 code?

The transmission control module and PCM will need to be reprogrammed by a mechanic in order to solve this issue. All wiring relating to the transmission control module should be checked for signs of trouble and react accordingly. After following through with any necessary repairs, make sure to give the vehicle a test drive directly afterwards to see if the trouble code returns.

Additional comments for consideration regarding the P0631 code

The P0631 is noted for its rarity. Mechanics report few cases of this issue. The P0631 is usually avoided entirely by properly reprogramming modules in the first place.

Need help with a P0631 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...


Related questions

Q: I need to know what the trouble code P19DA means

Hi there. The code P19DA means that the fuel pump is not sending a signal back to the PCM. This is usually caused by a burned motor in the fuel pump or a burned meter wire in the fuel pump...

Q: Bmw 2005. e90 320i N46, have cel on, code is p0013. Engine is stalling, consumption is higher. What do you suggest?

Hello. P0013 is the code for a malfunction of Camshaft Position Actuator Circuit B (Bank 1). It may be possible that there is an issue with the cam actuator or the Vanos oil control solenoid. If either of those components...

Q: P0016

Hi...Diagnostic Trouble Code P0016 has many causes other than a failed camshaft position sensor. Other possible causes for Code P0016(https://www.yourmechanic.com/article/p0016-obd-ii-trouble-code-camshaft-position-a-camshaft-position-correlation-bank-1-by-jay-safford) to set include: the camshaft timing is wrong because the timing chain jumped teeth; the camshaft phaser is out of...