fault code guide
U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module
Your car computers have lost contact with the instrument cluster on the dashboard. You may lose your speedometer, fuel gauge, and critical warning lights while driving.
How it shows up: The engine management light or stability control light will appear, while your dashboard dials may drop to zero and digital screens go blank. A diagnostic scanner will read code U0155 stored across multiple control modules.
Updated 10 November 2026
Can I keep driving?
Service soon
You can usually drive a short distance, but losing your speedometer and overheat warnings makes it unsafe for longer journeys.
What to do right now
- 1Safely pull over into a car park or onto a quiet road to see which gauges and warning lights are still working.
- 2Switch off the ignition, wait two minutes for the onboard computers to enter sleep mode, and restart the engine to see if the cluster resets.
- 3If your speedometer and temperature gauges remain completely dead, arrange to drive straight home or to a nearby garage at modest speed.
Likely causes
Most likely first.
- Likely
Weak or failing 12-volt battery
A battery with low resting voltage drops sharply during engine cranking, which starves sensitive electronic modules of power and breaks network communication.
- Likely
Loose or corroded cluster wiring connector
The multi-pin plug behind the dashboard can loosen over time or develop oxidised pins from cabin humidity, breaking the high-speed data connection.
- Possible
Faulty instrument cluster circuit board
Cracked solder joints or damaged microprocessors on the cluster board prevent it from transmitting and receiving messages across the data bus.
- Possible
Blown instrument cluster fuse
A short circuit or voltage spike can blow the fuse supplying constant or switched power to the cluster, shutting it down entirely.
- Rare
Damaged CAN bus wiring
Chafed, pinched, or rodent-damaged communication wires between the gateway module and the dashboard interrupt the data stream.
What you can check yourself
Park somewhere safe and level, engine off, before you start.
- 1
Test 12-volt battery health
Use a basic multimeter across the battery terminals with the engine switched off. A healthy battery should read around 12.6 volts; anything below 12.2 volts can cause modules to shut down communication.
- 2
Inspect the dashboard fuses
Check your owner handbook to find the fuse box location and identify the fuses for the instrument panel, cluster, or interior electronics. Pull the fuse out and inspect the small metal link inside to confirm it is not broken.
- 3
Check battery terminal connections
Ensure both battery clamps under the bonnet are tight and free from white powdery corrosion. Loose clamps cause rapid voltage drops that confuse vehicle networks.
- 4
Gently tap the dashboard surround
With the engine idling, lightly tap the plastic surround above the dials with your hand. If the dials flicker or turn back on, the wiring connector behind the unit is loose or the circuit board has cracked solder joints.
Rough cost to fix
Rough estimateTypical prices in Ireland (€) and the UK (£), from an independent garage up to a main dealer. The total cost depends mainly on whether your original cluster can be repaired by a specialist or must be replaced and coded by a main dealer.
12-volt battery replacement
- Do it yourself
- €90–230£80–200 in the UK
- At a garage
- €140–320£120–280 in the UK
Instrument cluster wiring repair or terminal cleaning
- Do it yourself
- €15–40£10–35 in the UK
- At a garage
- €120–260£100–220 in the UK
Instrument cluster specialist bench repair and soldering
- Do it yourself
- Garage job
- At a garage
- €220–480£190–420 in the UK
Replacement instrument cluster and module programming
- Do it yourself
- Garage job
- At a garage
- €550–1,400£480–1,200 in the UK
When to go to a garage
- The car refuses to start because the immobiliser built into the cluster cannot verify your key.
- The entire instrument cluster remains black and completely unresponsive after a battery reset.
- Multiple other warning lights appear together and your power steering assist cuts out.
- You smell electrical burning or see smoke emerging from behind the steering column or dashboard.
Questions drivers ask
Can I drive my car with code U0155?
You can drive a short distance if the engine runs normally, but doing so is risky. Without an active cluster, you cannot monitor your vehicle speed, coolant temperature, or oil pressure warnings. In some models, the immobiliser is linked to the cluster, meaning the car may refuse to restart once switched off.
Will clearing the fault code fix the instrument cluster?
No, clearing the code with an OBD scanner will only delete the fault record from the computer memory. If the underlying issue such as low battery voltage, a broken wire, or cracked circuit board solder remains, the code and dashboard blackouts will return almost instantly.
How does U0155 differ from U0100?
Code U0155 specifically refers to lost communication with the instrument cluster on the dashboard. Code U0100 indicates lost communication with the main engine control module. While U0155 usually leaves the engine running without functioning gauges, U0100 frequently stops the engine from running altogether.
Will my car pass the NCT or MOT with code U0155?
The tester will notice an inoperative dashboard or missing instrument dials, so get the fault fixed before the test. On the MOT, an illuminated engine management light is an automatic fail for petrol cars registered from July 2003 and diesels from July 2008. If the cluster fault prevents the tester from reading mileage or checking mandatory warning lights, the test cannot be completed.
Test rules here are for the National Car Test in Ireland (NCT) and the MOT in the UK. Elsewhere, check the regulations of your own country or state before going for a vehicle test.
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General guidance for most cars, not a diagnosis of yours. Details differ by make, model and year - check your handbook, and if in doubt, don't drive.