U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module
Quick Answer
Not safe to drive
U0155 means another control module has stopped receiving data from the instrument cluster, the display behind the steering wheel with the speedometer and warning lights. It can come from the cluster itself, its power or ground, or the data wiring between modules. Because the code is stored by another module, such as the engine or body computer, rather than by the cluster, the first step is to find out whether the cluster is dead or the network is the problem.
- Severity
- High · Electrical
- Estimated repair cost
- From €22 to €950+, varies by vehicle
€22 or €950, depending on your car.
- Replace cluster fuse or repair power and earth wiring€22–€140
- Replace instrument cluster with coding€230–€950
A scan shows whether U0155 is really stored on your car, which codes sit next to it and how urgent each one is. You can do this parked, with the ignition on.
A scan needs a Bluetooth OBD2 adapter (Bluetooth LE on iPhone), about €25-60; the built-in demo runs without one. See which adapter to buy
What does U0155 mean?
U0155 is a electrical-related diagnostic trouble code classified as high severity.
What are the symptoms of U0155?
- Speedometer, rev counter or fuel gauge dead, frozen or moving erratically
- Warning lights on at the same time, or none lighting during the bulb check
- Mileage display showing dashes or a wrong figure
- Immobiliser or security light stays on
- Engine will not start, or stalls, on some cars
- ABS, airbag or check engine light on together with U0155
- Other U-codes stored in other modules
What causes U0155?
Blown cluster fuse or a loose power or ground connection at the cluster
: high
Failed cluster electronics, which gets worse with heat cycles and age
: high
Damaged or corroded connector or CAN wiring at the cluster plug
: medium
Low battery voltage briefly dropping the cluster off the network
: medium
Water reaching the cluster, wiring or gateway from a leaking windscreen seal or scuttle
: medium
Faulty gateway or body control module blocking the traffic to the cluster
: low
Is it safe to drive with U0155?
No - address this immediately. Without the instrument cluster you may have no speedometer, fuel or temperature gauge, and many cars also show oil, brake, charging and airbag warnings only through the cluster. On some cars the engine will not start or stalls as well. Do not rely on a car with a dead cluster for normal driving. Get it checked before the next trip.
How do you diagnose U0155?
- Switch the ignition on and watch the cluster. Check whether it lights up and runs its bulb check, because a totally dark cluster points to power, ground or the cluster itself.
- Test the battery, since a weak battery can make the cluster lose contact for a moment and leave a stored code behind.
- Find the cluster fuse in the wiring diagram and test it with a meter, not just by sight.
- Check power and ground at the cluster connector with the ignition on, and look at the plug for corrosion, loose pins or water marks.
- Scan every module with a scanner that reaches them all, and see who else reports a lost-communication code. Many codes at once point to the data bus, while U0155 alone points at the cluster side.
- With the car asleep and the ignition off, measure resistance between pins 6 and 14 of the diagnostic socket. About 60 ohms is normal for a healthy CAN bus.
- Look for damp carpet, a wet scuttle or a leaking windscreen seal that could reach the dash wiring.
- Replace or repair the cluster only after power, ground and the bus pass. A replacement cluster usually needs coding to the car and the mileage matched.
How much does U0155 cost to fix?
| Repair | Parts Cost | Labor Cost | Total Estimate | DIY Difficulty |
|---|---|---|---|---|
| Replace cluster fuse or repair power and earth wiring | €2–€40 | €20–€100 | €22–€140 | Easy |
| Battery replacement | €60–€200 | €20–€60 | €80–€260 | Easy |
| Repair CAN wiring or cluster connector | €10–€60 | €80–€250 | €90–€310 | Moderate |
| Instrument cluster repair by a specialist | €80–€300 | €40–€150 | €120–€450 | Professional |
| Replace instrument cluster with coding | €150–€700 | €80–€250 | €230–€950 | Professional |
Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.
Related diagnostic codes
Common questions about U0155
- What does U0155 mean in plain words?
- The car's computers asked the instrument cluster for data and got no answer. It is a communication code, so the fault could be the cluster, its power supply, its plug, or the wiring that connects it to the rest of the car.
- Can I clear U0155 and carry on?
- Clearing removes the stored code, but a dead or flickering cluster will bring it back. If you lost any gauges or warning lights, do not rely on the car until the cause is found.
- Is the speedometer the only thing affected?
- No. Many cars send warning lamps for oil pressure, brakes, charging and airbags through the cluster as well, and on some models the engine computer needs cluster data to start. A dead cluster can therefore hide real problems.
- Does a new cluster fix U0155?
- Only if the cluster was the fault. Replacing it before testing power, ground and the bus is a common way to spend several hundred euros and keep the code. A replacement also needs coding and the mileage set correctly.
- Can a weak battery cause U0155?
- Yes. Low or unstable voltage can drop modules off the network, and the cluster is one of the first to notice. Test and charge the battery before you pay for any other diagnosis.