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

U0155 means Lost Communication With Instrument Panel Cluster (IPC) Control Module. Another module has stopped receiving messages from the instrument cluster.

CodeU0155
SystemNetwork communication
SeverityHigh
TypeGeneric network communication

Can I keep driving? Limit driving and diagnose promptly. Continued driving can cause damage, stalling or limp mode.

Common symptoms

  • Several warning lights at once
  • Modules or features not working
  • Possible no-start or limp mode, depending on the module

Possible causes

  • Low battery voltage or poor ground
  • Blown fuse or lost power to the module
  • Damaged CAN bus wiring or connector
  • Failed module
  • Aftermarket accessories tapped into the network

How to diagnose U0155

  1. Check battery voltage and grounds first.
  2. Scan all modules to see which ones do not respond.
  3. Check power and ground to the non-responding module.
  4. Measure resistance between CAN-H and CAN-L at the diagnostic connector with the battery disconnected; many high-speed CAN networks read about 60 Ω.
  5. Inspect wiring and connectors along the bus.

What the code means, digit by digit

UNetwork communication0Generic (SAE) code1Sub-system55Specific fault

Generic codes have the same definition on every OBD-II vehicle (petrol cars from model year 1996 in the US, 2001 in the EU; diesels later). Manufacturers can add their own enhanced codes; those are not listed here.

Related codes

General guidance only. Fault codes describe what the engine computer saw, not which part failed: confirm with testing before replacing parts, and follow the vehicle's service information.