U05C0 code meaning
Invalid Data Received From Interior Lighting Control Module B
What U05C0 means
Cars with extensive ambient and cabin lighting split it across several controllers; module B is the second of these, for instance for the rear cabin, the doors or a separate light strip, while A runs the main zone. These nodes usually hang on a LIN line below the body controller, which sends them color and brightness commands and polls their status; Microchip's reference design runs this at about 10.4 kbit/s with a checksum on every frame. U05C0 is set when status replies from module B arrive but are corrupt or implausible, as opposed to U02BF, where B stops replying. No manufacturer documents U05C0 or the allocation of letter B. Expect zones that stay dark or show the wrong color, while the main interior lights controlled by module A (U054B) keep working.
U05C0 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U05C0
- Ambient light zone stays dark or flickers
- Wrong color or brightness in part of the cabin
- Lighting settings in the menu not applied to all zones
Common causes of U05C0
- PossibleLED controller of lighting module B defective
- PossibleLIN line or connector to module B damaged, for example in a door hinge area
- Less likelyReplacement module B not configured for its zone
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Interior lighting module b
What each part of U05C0 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C0 | The exact fault in that area. |
What to do next
- Note U05C0 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 U05C0
What does U05C0 mean?
U05C0 means "Invalid Data Received From Interior Lighting Control Module B". Cars with extensive ambient and cabin lighting split it across several controllers; module B is the second of these, for instance for the rear cabin, the doors or a separate light strip, while A runs the main zone. It is a generic code, so it means the same on every make.
Is it safe to drive with U05C0?
U05C0 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U05C0 fail an emissions test?
U05C0 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 U05C0 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U05C0 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.