U0242
Lost Communication With Headlamp Control Module B
U0242 is an OBD-II diagnostic trouble code meaning: Lost Communication With Headlamp Control Module B. Common causes: open or short circuit in the wiring to the module, malfunction of the headlight control module. Estimated repair cost: $56–167.
Symptoms
- Some headlight functions do not work (for example, cornering lights)
- Error message on the dashboard
- Headlights only work in basic mode
- Adaptive lighting does not function
Causes
- Open or short circuit in the wiring to the module
- Malfunction of the headlight control module
- Connector corrosion
- Module power problems
- Software glitches
How to Fix
- Check the integrity of wiring and connectors
- Test the power supply and ground of the module
- Scan the module for additional errors
- If necessary, replace the headlight module
- Reflash the module if there are updates
Related codes
Error U0242 by Vehicle Brand
FAQ
What does the U0242 code mean?
U0242 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Headlamp Control Module B
What causes a U0242 error code?
The most common causes of U0242 include: Open or short circuit in the wiring to the module; Malfunction of the headlight control module; Connector corrosion; Module power problems.
How do I fix a U0242 diagnostic trouble code?
To fix U0242: Check the integrity of wiring and connectors. Test the power supply and ground of the module. Scan the module for additional errors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0242?
Limited driving only, diagnose soon
How much does it cost to fix U0242?
The estimated repair cost for U0242 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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