U0155
Lost Communication with Instrument Panel Cluster
CAN messages from or to the instrument cluster are missing. The cluster is the user-facing interface — speedometer, tachometer, warning lamps, fuel level, odometer — so failure is immediately visible. On some cars warning lamps from other modules can no longer illuminate either.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
Ordered by how often each turns out to be the cause.
- Cluster unpowered or fuse blownCommon
- Cluster internal failure (common on aged TFTs)Possible
- Gateway module routing CAN messages incorrectlyLess likely
Parts involved
- Instrument Cluster
- CAN Bus Wiring
U0155 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.