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Generic SAE code Network communication

U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module

Another module has stopped receiving messages from the instrument cluster.

Normal risk

Have it checked soon. Warning lights and gauges may not display correctly.

Short answer · Can I keep driving with U0155?

Possibly, but you may not see warnings or speed correctly. Have it checked soon.

On this page

What does U0155 mean?

U0155 is stored when modules stop receiving messages from the instrument panel cluster (IPC).

What the car does when the code is set

Functions of the affected module may stop working or behave strangely, for example lights, locks, climate control, displays or the radio.

How the system works

Body functions such as lights, locks, displays, climate control and audio are handled by modules on the body network. A gateway often links this network to others. Missing messages from one module are stored as lost communication codes in the others.

UNetwork
0Generic code (SAE)
1Network communication
55Specific fault

Common symptoms

Master Warning LightRed lightHigh riskBattery Keeps Going FlatCheck soonNormal riskDim Or Flickering LightsCheck soonNormal risk

Possible causes

Listed without ranking. The cause on your car depends on make, engine and mileage — see the maker notes below.

  1. Power or ground fault at the moduleA blown fuse or poor ground.
  2. Network wiring faultDamaged or corroded wires and connectors.
  3. Low battery voltageCommon after the car has stood for a long time.
  4. Aftermarket equipmentAccessories connected to the body network can disturb it.
  5. Failed modulePossible, but check the basics first.

How it is diagnosed

  1. Check which functions do not workLights, locks, dashboard displays or climate control point to the module concerned.
  2. Check fuses and battery voltageUse the fuse diagram for the module.
  3. Look for water entryWet carpets, door seals and sunroof drains often explain corroded body modules.
  4. Scan all modulesA workshop checks whether the module responds and tests the network.

Questions about U0155

Why does the cluster matter for safety?

It shows warning lights and speed; without it you may miss important warnings.

Is a body network code dangerous?

Usually not for driving, unless lights, wipers or other safety functions stop working.

Terms on this page

ECU (Engine Control Unit)FuseCar Battery