U0155: Lost communication with the instrument cluster
The vehicle network is not receiving messages from the instrument cluster. The speedometer, warning lights or dashboard messages may stop working.
| Code | U0155 |
|---|---|
| System | Communication network |
| Group | U01xx, Lost communication with control units |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What U0155 means
The instrument cluster shows speed, revs, fuel and all the warning lights, and on many cars stores data such as mileage. This code means it has stopped talking to the other control units over the data network. On some cars it also plays a part in the immobiliser.
Most common causes
- Low battery or loose terminals
- Blown instrument cluster fuse
- Loose or corroded connector behind the cluster (common after dashboard or radio work)
- Poor ground on the cluster
- Damaged network wiring behind the dashboard
- Faulty instrument cluster (solder joints or display)
Symptoms
- Needles at zero or cluster display dead
- Warning lights not coming on, or all on at once
- Fuel or temperature gauge with no reading
- On some cars, no start
Can you drive with U0155?
With care You can drive carefully if the car runs well, but without the speedometer and warnings you would miss a serious fault such as overheating or low oil pressure. Get it fixed soon.
Open the bonnetthe in-depth explanation
How to check it
Notice whether the cluster goes fully or partly dead, and whether it happens over bumps or when hot: that points to a connector or solder joint. Meanwhile you can watch engine temperature live with the reader.
How to read and clear U0155 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 U0155 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
- U0151 Lost communication with the restraints control module
- U0152 The left side airbag control unit is not answering on the car network
- U0153 The right side airbag control unit is not answering on the car network
- U0154 The airbag occupant detection control unit is not answering on the car network
- U0156 The central information A is not answering on the car network
- U0157 The central information B is not answering on the car network
- U0158 The head raising display is not answering on the car network
- U0159 Communication with the parking aid has been lost
- 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 U0155 mean?
The instrument cluster shows speed, revs, fuel and all the warning lights, and on many cars stores data such as mileage. This code means it has stopped talking to the other control units over the data network. On some cars it also plays a part in the immobiliser.
Can you drive with U0155?
You can drive carefully if the car runs well, but without the speedometer and warnings you would miss a serious fault such as overheating or low oil pressure. Get it fixed soon.
How do you clear U0155?
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, U0155 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.
