U0155 means Lost Communication With Instrument Panel Cluster (IPC) Control Module. A module on the vehicle network has stopped hearing from the instrument cluster. It is a generic OBD-II code, so the definition is the same on any make, but the most likely cause varies by engine; confirm with a scan tool and the service information for your vehicle before buying parts.
What U0155 means
Modern vehicles have many control modules that share information over a network, usually called the CAN bus. Codes starting with U mean a module has stopped hearing another one, and voltage and processor codes mean a module is not getting clean power or has an internal fault. Low battery voltage, poor grounds, blown fuses and damaged wiring cause many of these codes, so test the battery and charging system first.
U0155 symptoms
- Dead or flickering gauges
- Warning lights and chimes acting up
- No-start on some vehicles where the cluster is part of the security system
Common causes of U0155
- Cluster without power or ground
- Damaged network wiring or a loose cluster connector
- Low battery voltage
- Failed cluster
How to diagnose U0155
- Check cluster fuses, power and ground
- Check the connector behind the cluster
- Check communication with the cluster on a scan tool
Can you drive with U0155?
Without working gauges you cannot see speed, temperature or warnings; repair before relying on the vehicle.
U0155 tips
On some vehicles the instrument cluster is part of the anti-theft system, so a cluster that drops off the network can cause a no-start as well as dead gauges.
Will U0155 clear itself?
If the fault stops, the computer turns off the check engine light by itself after several drive cycles without seeing it again, and the code stays in memory as history for a while. Clearing U0155 with a scan tool after a repair is fine, but if the cause is still there the code returns, sometimes within one drive. Disconnecting the battery also clears codes on most vehicles, but it erases learned fuel trims and idle settings as well.
Related codes
| Code | Meaning |
|---|---|
| U0100 | Lost Communication With ECM/PCM A |
| U0140 | Lost Communication With Body Control Module |
| U0073 | Control Module Communication Bus A Off |
Guides that help
When it is more than a sensor
Voltage and network codes come from wiring, the battery, the charging system or a module, not from engine or transmission wear. If a lost-communication code has left the transmission in limp mode, rule out the module and wiring before deciding the unit has failed, and see our transmissions only if testing confirms internal damage.
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