U0241Lost Communication With Headlamp Control Module A
- Generic OBD-II code · Network
- How the car detects it
- Headlamp control module A runs the electronic front lighting, for example beam levelling, cornering light or LED segments. Ford calls it HCM; it sits on the vehicle network and logs network faults of its own, as on the 2017 Lincoln MKZ after remote start (SSM 46508). U0241 is stored by a listener such as the body controller, cluster or gateway once the periodic frames of module A stop arriving within its timeout; no maker publishes that limit. Land Rover names U0241-00 among several U codes on the 2015 LR4, caused by a console cooler box that stays powered after switch-off and disturbs other modules, cured by reflashing the ABS unit (SSM72146). Expect a headlamp warning and adaptive functions held at a basic beam. Module B is U0242; corrupt data from A give U0542.
- What you may notice
- Headlamp or adaptive lighting warning in the cluster
- Cornering, levelling or matrix functions inactive, basic low beam only
- Several U codes in other modules at the same time
- Likely causes
- LikelyHeadlamp module without power or ground (fuse, connector at the lamp)
- PossibleDamaged or corroded bus wiring in the front end, often after a collision or lamp replacement
- PossibleNetwork disturbed by another module or accessory staying awake (Land Rover cooler box)
- RareHeadlamp module software fault or internal failure
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.