What it means
A control module has stopped receiving expected messages from the instrument panel cluster control module. The cluster or information it provides may be unavailable, depending on the vehicle.
At a glance
- Usually lights the warning light of the system that lost communication
How it works
The instrument panel cluster (IPC) operates the gauges and displays, and it exchanges information with other modules over the vehicle network. U0155 sets in a module that does not receive expected IPC messages; it points to a communication loss rather than identifying whether power, wiring, voltage, or the cluster caused it.
Common causes
Most likely first.
- Instrument panel cluster power or ground fault
- Damaged network wiring or connector
- Instrument panel cluster failure
- Low system voltage
Symptoms
- Instrument panel display or gauges may be unavailable
- Warning lights or messages
- Other communication codes
How to diagnose it
- Scan all modules for U0155 and related communication codes, and check whether the IPC itself responds to the scan tool.
- Check battery condition and charging voltage because low system voltage can interrupt cluster communication.
- Inspect IPC fuses, accessible power and ground connections, and connectors for looseness, corrosion, or water intrusion.
- Inspect network wiring at the cluster and related connectors for damage or poor contact.
- Test IPC power, ground, and network circuits using the wiring diagram and the manufacturer's specified conditions before considering cluster replacement.
Common fixes
- Correct low battery voltage or a charging system connection problem.
- Replace a failed IPC fuse after checking why it opened.
- Clean and secure a corroded cluster connector or repair its ground.
- Repair damaged network wiring or replace the IPC if circuit tests confirm an internal fault.
Can I keep driving?
If gauges or warning displays are missing, you may not be able to monitor speed, engine temperature, or other critical information reliably. Avoid driving until essential displays and warnings work; if they fail while driving, pull over safely.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.