U02BE code meaning
Lost Communication With Trailer Backup Assist Control Module
Network system Generic code U02xx codes Check engine light
What U02BE means
The trailer backup assist module steers the tow vehicle in reverse so the trailer follows a curve the driver chooses with a knob; with Ford's Pro Trailer Backup Assist the hitch angle comes from a target sticker filmed by the backup camera or from a trailer-mounted sensor. Ram names its unit TRSCM. For the 2021 Ram 1500, STAR case S2108000067 shows U02BE active in the ABS, power steering and engine controllers while the TRSCM is absent from the CAN C bus; the driver gets a throttle-control service warning, the MIL and at times Rear Park Assist unavailable. The trigger was module software: cutting its power via fuse 53 or the connector restarts it, an update was planned, and a new module does not help. Otherwise only the assist is lost.
U02BE at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U02BE
- Trailer backup assist unavailable
- Ram: throttle control message, MIL and rear park assist unavailable
- Code stored in several modules at once
Common causes of U02BE
- Most likelyModule software hangs and the unit drops off the bus (Ram 1500, 2021)
- PossibleFuse, supply or connector of the module faulty
- Less likelyCAN wiring to the module damaged
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Trailer backup assist moduleVehicle bus wiring
What each part of U02BE means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| BE | The exact fault in that area. |
What to do next
- Note U02BE 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 U02BE
What does U02BE mean?
U02BE means "Lost Communication With Trailer Backup Assist Control Module". The trailer backup assist module steers the tow vehicle in reverse so the trailer follows a curve the driver chooses with a knob; with Ford's Pro Trailer Backup Assist the hitch angle comes from a target sticker filmed by the backup camera or from a trailer-mounted sensor. It is a generic code, so it means the same on every make.
Is it safe to drive with U02BE?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U02BE fail an emissions test?
U02BE 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 U02BE to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. This is a job for a workshop.
Will U02BE clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.