U018A: The headlight levelling control unit B is not answering on the car network
The headlight levelling control unit B is not answering on the car network. It is usually that control unit, its power supply or the network wiring.
| Code | U018A |
|---|---|
| System | Communication network |
| Group | U01xx, Lost communication with control units |
| Type | Generic: it means the same on every make |
How to read and clear U018A with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see U018A with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- U0186 The audio amplifier is not answering on the car network
- U0187 The digital disc player changer module A is not answering on the car network
- U0188 The digital disc player changer module B is not answering on the car network
- U0189 The digital disc player changer module C is not answering on the car network
- U0190 The digital disc player changer module D is not answering on the car network
- U0193 The digital audio control unit A is not answering on the car network
- U0194 The digital audio control unit B is not answering on the car network
- U0196 The rear seat entertainment control unit is not answering on the car network
- U0100 Lost communication with engine control module (ECM/PCM A)
- U0101 Lost communication with transmission control module (TCM)
- U0102 Lost communication with transfer case control module
- U0103 Lost communication with the gear shift module
What does code U018A mean?
The headlight levelling control unit B is not answering on the car network. It is usually that control unit, its power supply or the network wiring.
How do you clear U018A?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, U018A comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
