U0241 code meaning
Lost Communication With Headlamp Control Module A
What U0241 means
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.
U0241 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0241
- 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
Common causes of U0241
- Most 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)
- Less likelyHeadlamp module software fault or internal failure
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Headlamp module aCAN bus
What each part of U0241 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 41 | The exact fault in that area. |
What to do next
- Note U0241 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 U0241
What does U0241 mean?
U0241 means "Lost Communication With Headlamp Control Module A". Headlamp control module A runs the electronic front lighting, for example beam levelling, cornering light or LED segments. It is a generic code, so it means the same on every make.
Is it safe to drive with U0241?
U0241 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0241 fail an emissions test?
U0241 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 U0241 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0241 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.