Fault code lookup

NetworkU0242

Serious

Severity: Serious - have it checked soon

Lost Communication With Headlamp Control Module B

23 brands affected · Generic SAE J2012 description.

Key terms: Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list

1What it means in plain English

Control modules in the car cannot communicate with each other over the vehicle network.

2Common causes

  1. Wiring or connector fault on the communication bus
  2. Faulty control module
  3. Low battery voltage or poor ground
  4. Water ingress in a connector or module
  5. Aftermarket device interfering with the bus

3Can I drive?

Serious · drive with care

The car may run normally or may not run at all. If the module that has lost communication controls steering, brakes, park brake, charging or engine cooling, drive only if those systems feel normal; stop safely if the steering becomes heavy, a brake warning appears, or the engine temperature climbs. If the car will not start or runs badly, have it towed.

This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.

4Brand data 23

BrandCodeDescriptionSystem
Ashok Leyland CVU0242Lost Communication With Headlamp Control Module B SAENetwork
BAIC MotorU0242Lost Communication With Headlamp Control Module B BrandNetwork
BYDU0242Lost Communication With Headlamp Control Module B BrandNetwork
CheryU0242Lost Communication With Headlamp Control Module B BrandNetwork
DaewooU0242Lost Communication With Headlamp Control Module B BrandNetwork
DFFSU0242Lost Communication With Headlamp Control Module B BrandNetwork
DFFXU0242Lost Communication With Headlamp Control Module B BrandNetwork
DFXKU0242Lost Communication With Headlamp Control Module B BrandNetwork
EOBDU0242Side kaotatud esitulede juhtmooduliga B BrandNetwork
GeelyU0242Lost Communication With Headlamp Control Module B BrandNetwork
GMU0242Lost Communication With Headlamp Control Module B BrandNetwork
Great WallU0242Lost Communication With Headlamp Control Module B BrandNetwork
HafeiU0242Lost Communication With Headlamp Control Module B BrandNetwork
HoldenU0242Lost Communication With Right Headlamp High Beam Control Module BrandNetwork
HyundaiU0242Lost Communication With Headlamp Control Module B SAENetwork
Land RoverU0242Lost communication with the headlamp control module B BrandNetwork
OpelU0242Lost Communication With Headlamp Control Module B BrandNetwork
PeugeotU0242Lost Communication With Headlamp Control Module B SAENetwork
SaabU0242Lost Communication With Headlamp Control Module B BrandNetwork
Maxus (SAIC)U0242Lost communication with FEM BrandNetwork
MG (SAIC)U0242Lost communication with FEM BrandNetwork
SuzukiU0242Lost Communication With Headlamp Control Module B SAENetwork
ToyotaU0242Lost communication with headlamp control module B BrandNetwork

Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.

5Related codes

  • U0240 Lost communication with entrapment control module B
  • U0241 Lost Communication With Headlamp Control Module A
  • U0243 Lost Communication With Parking Assist Control Module B
  • U0244 Lost communication with running board control module A
  • U0245 Lost Communication With Entertainment Control Module - Front
  • U0246 Lost communication with seat control module E
  • U0247 Lost communication with seat control module F
  • U0248 Communication with PEPS lost
  • U0249 Lost Communication With Entertainment Control Module - Rear B
  • U024A Lost Communication With Interior Lighting Control Module A
  • U024B Lost communication with seat control module 'G'
  • U024C Lost communication with seat control module 'H'

Browse Uxxx codes or U024xx codes.

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