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ElectricalSeverity High: diagnose before driving on

U0155Lost Communication With Instrument Panel Cluster (IPC) Control Module

What it means

A control module stopped receiving messages from the instrument cluster on the data bus (CAN). The instrument cluster may be without power or ground, or the bus wiring to it is faulty.

Symptoms

  • Gauges dead or warning lights not working
  • Several warning lights at once
  • Other modules may store related codes

Common causes

  • No power or ground at the instrument cluster
  • CAN wiring open, shorted or corroded (CAN-H / CAN-L)
  • Low battery voltage during cranking
  • Failed instrument cluster

What to check first

  1. Check fuses, supplies and grounds at the instrument cluster
  2. Measure CAN-H to CAN-L resistance with the battery disconnected (about 60 Ω on most cars)
  3. Scope CAN-H and CAN-L for a clean mirrored signal
Can I drive with U0155? Not recommended. U0155 can lead to stalling, limp mode or engine damage; diagnose it before driving further.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

How to test the parts behind U0155

CAN bus networkWiring, typical values, multimeter and scope tests

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U0155: questions and answers

What does U0155 mean?

U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module. A control module stopped receiving messages from the instrument cluster on the data bus (CAN). The instrument cluster may be without power or ground, or the bus wiring to it is faulty.

What are the symptoms of U0155?

Gauges dead or warning lights not working. Several warning lights at once. Other modules may store related codes.

What causes U0155?

No power or ground at the instrument cluster. CAN wiring open, shorted or corroded (CAN-H / CAN-L). Low battery voltage during cranking. Failed instrument cluster.

How do you diagnose U0155?

1. Check fuses, supplies and grounds at the instrument cluster 2. Measure CAN-H to CAN-L resistance with the battery disconnected (about 60 Ω on most cars) 3. Scope CAN-H and CAN-L for a clean mirrored signal

Can I drive with U0155?

Not recommended. U0155 can lead to stalling, limp mode or engine damage; diagnose it before driving further.