Is It Safe to Drive With a U0155 Code?
Common Symptoms of a U0155 Fault
Gauges not working
Warning lights not illuminating or all on
Odometer not displaying
Multiple system warnings
Possible Causes of U0155
A U0155 code can be triggered by faults across several systems. Identifying the exact root cause requires proper diagnostic equipment and live data — not just reading the code.
CAN Bus Wiring to Cluster
CAN bus wiring to the instrument cluster is damaged.
Instrument Cluster Power Fault
Poor power or earth to the instrument cluster.
Instrument Cluster Failure
The instrument cluster itself has failed.
Battery / Voltage Issue
Low voltage affecting cluster communication.
Why we don't list the exact part: A U0155 code tells you what's happening but not why. Replacing parts based on the code alone is the most common way drivers waste money. A proper diagnosis identifies the specific cause first.
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U0155 and Your MOT
A stored U0155 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test — an automatic failure under current MOT standards. Even if the light temporarily clears, the code remains in ECU memory and can be read by testers.
Get the fault diagnosed and repaired first, then have the code cleared and confirm the light stays off before booking your MOT.