What does your fault code mean?
What does your fault code mean?
Free OBD2 fault code lookup
A diagnostic trouble code (DTC) is your car's way of telling you something needs attention. This free lookup covers the 200 most common OBD2 fault codes — plain-English meanings, causes, severity, and what to do next.
254 codes found
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- U0140 OBD-II code U0140 flags loss of communication with the body control module — the network can no longer see the BCM, which manages lighting, locks, and comfort features. Lost Module CommunicationHigh
- U0155 OBD-II code U0155 flags loss of communication with the instrument panel cluster — the network can no longer see the dashboard cluster module. Lost Module CommunicationMedium
- U0401 OBD-II code U0401 flags that another module received invalid or implausible data from the ECM/PCM — the bus works, but the message payload is wrong. Invalid Module DataMedium
- U0402 OBD-II code U0402 flags that another module received invalid or implausible data from the TCM — the network works but transmission messages are wrong. Invalid Module DataMedium