U0137Lost Communication With Trailer Brake Control Module
- Generic OBD-II code · Network
- How the car detects it
- U0137 means the trailer brake control module, which energises a towed trailer’s electric brakes in step with the tow vehicle's braking, is missing on the bus. Ford uses the code widely: on 2022 F-150 trucks without that module the ABS unit may store U0137 by mistake, and it can then be ignored (SSM 50418); on F-150, Expedition, Navigator and Ranger of 2021–2024 the IPC, BCM or PSCM log it together with a warning that the trailer brake module has failed, solved by disconnecting the battery and module and reprogramming the trailer module (SSM 53236). Ram 1500–3500 with integrated trailer brake module can show Park Assist System Disabled with U0137 (FCA 9004253). Invalid data from this module is U0438. Check the trailer brakes before towing.
- What you may notice
- Trailer brake fault message in the cluster
- Trailer brakes not applied or gain control inoperative
- Park assist disabled on some Ram trucks
- Likely causes
- LikelyTrailer or ABS module software, fixed by reprogramming (Ford SSM 53236, 50418)
- PossibleImproperly seated connector, damaged harness or water intrusion at the module (FCA 9004253)
- PossibleModule retrofitted or configured incorrectly (dealer-installed tow package)
- RareTrailer brake control module internally faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.