U031A code meaning
Software Incompatibility With Transmission Range Control Module
What U031A means
In shift-by-wire drivelines the transmission range control module carries out the driver's range request by mechanically engaging park, reverse, neutral or drive. U031A means a partner, such as the transmission or shifter controller, rejects its software or calibration. Ford's 2014 code interpretation lists U031A without the MIL marker. On the 2017 Buick LaCrosse and Cadillac XT5, GM bulletin 16-NA-373 traced a MIL with a Service Transmission message and P17xx codes to a calibration anomaly in the TRCM and cured it by reprogramming; separately, program 17075 replaced units whose actuator gear broke and left the car stuck in Park. A mismatched TRCM can likewise refuse range changes or default to Park. U019E means lost contact, U049F invalid data, U0304 a software mismatch with the shifter itself.
U031A at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U031A
- Service transmission or shift system warning
- Range changes refused, car stays in Park
- Wrong range shown in the display
Common causes of U031A
- Most likelyTRCM calibration outdated or faulty, newer release available
- PossibleTRCM/range actuator replaced without programming and learn procedure
- Less likelyTransmission or shifter controller updated without the TRCM
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Transmission range moduleControl module software
What each part of U031A means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1A | The exact fault in that area. |
What to do next
- Note U031A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U031A
What does U031A mean?
U031A means "Software Incompatibility With Transmission Range Control Module". In shift-by-wire drivelines the transmission range control module carries out the driver's range request by mechanically engaging park, reverse, neutral or drive. It is a generic code, so it means the same on every make.
Is it safe to drive with U031A?
Drive gently and only to a workshop. With U031A the car can go into limp mode (reduced power) to protect itself.
Will U031A fail an emissions test?
U031A is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U031A to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will U031A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.