Network communication (U-codes) · Network · generic (SAE-defined)
U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module
U0155 means one or more modules stopped receiving network messages from the instrument panel cluster (IPC), the module that runs the gauges and warning lights.
Standard title per SAE J2012 / ISO 15031-6 · Updated 2026-11-07 · By CarWhere Research
How U0155 sets
The IPC exchanges data with other modules over the controller area network (CAN), such as receiving speed and warnings and sending driver inputs. When other modules lose its messages for longer than allowed, U0155 is stored. Conditions vary by manufacturer.
Common causes of U0155
Roughly most likely first; the actual cause depends on the vehicle and needs testing to confirm.
- Blown instrument cluster fuse
- Loose or corroded cluster connector
- Damaged CAN wiring behind the dash
- Low battery voltage
- Poor ground to the cluster
- Failed instrument cluster
U0155 symptoms
- Gauges dead, frozen, or erratic
- Warning lights not displaying
- Dash display blank
- Chimes or messages missing
- Other modules storing communication codes
How U0155 is diagnosed
- Scan all modules and see if the cluster responds directly.
- Check battery voltage and cluster fuses.
- Inspect the cluster connector and ground.
- Check CAN wiring continuity between the cluster and the network.
- Check for software updates or bulletins.
- Replace or repair the cluster if power, ground, and network checks pass.
Typical fixes for U0155
- Replace fuses and correct the cause
- Repair the cluster connector or ground
- Repair CAN wiring
- Repair or replace the instrument cluster, with programming and mileage setup as required
Replace parts only after testing confirms the cause — a code names the circuit or condition that failed a check, not necessarily the faulty part. We don’t publish per-repair prices; for what households actually spend on upkeep, see car repair costs.
Related codes & warning lights
U0155 FAQ
What does code U0155 mean?
U0155 means one or more modules stopped receiving network messages from the instrument panel cluster (IPC), the module that runs the gauges and warning lights. The standard definition is "Lost Communication With Instrument Panel Cluster (IPC) Control Module."
Can I drive with a U0155 code?
Possibly, but with care. If the gauges or warning lights are not working, you cannot see speed, fuel level, or critical warnings, so have it repaired soon and avoid long trips.
Does replacing the cluster change the odometer?
A replacement cluster typically must be programmed with the correct mileage, and odometer rules apply, so follow factory and legal procedures.
Can U0155 come and go?
Yes. Loose connectors or low voltage can cause intermittent dropouts, so the code may appear only occasionally.
Keep researching
More network communication (u-codes) codes
Sources
- SAE J2012 — Diagnostic Trouble Code Definitions (standard code titles)
- ISO 15031-6 — Road vehicles: communication between vehicle and external equipment for emissions-related diagnostics, Part 6: Diagnostic trouble code definitions
- U.S. EPA — Vehicle Emissions Inspection and Maintenance (I/M) programs
- U.S. EPA, 40 CFR 86.1806-17 — Federal onboard diagnostics requirements for light-duty vehicles
General information written by CarWhere Research, not a diagnosis of your vehicle. Manufacturers can add their own sub-definitions and test conditions; confirm with the factory service information for your year, make and model. Before paying for a repair, check NHTSA for open recalls and your warranty booklet: federal law requires an emissions warranty on major emission-control parts such as the catalytic converter and engine computer.