1230 code(s) in this category. Page 2 of 52. Select one to see the detailed diagnosis.
Red (U)
CAN-Low on the low-speed comfort bus is open. The bus runs in single-wire fallback only; a fault is set becaus…
CAN-Low on the low-speed bus is shorted to ground. Differential signaling is no longer reliable, modules drop …
CAN-Low on the low-speed bus is shorted to battery. Bus signaling is no longer possible; comfort modules drop …
Generic fault on vehicle communication bus A. The controller flags an unspecified electrical or protocol fault…
Generic fault on vehicle communication bus B. Used as a catch-all for unspecified problems on a secondary CAN/…
A fault has been detected on the dedicated powertrain sensor data bus (a sub-bus used for high-speed sensor da…
The plus line of vehicle bus C is open. Modules sharing this segment drop offline. A communication loss with t…
The communication bus A high-side line (CAN-H or equivalent) is at a higher voltage than allowed. Likely short…
The communication bus A low-side line (CAN-L) is open — broken wire, unplugged connector, or terminator missin…
Bus A low-side line voltage below the expected range. Short to ground or transceiver pulling line low.…
Bus A low-side line voltage above the expected range. Short to power or transceiver fault. A communication los…
The two lines of differential bus A are shorted together. Communication impossible — both lines see the same v…
Generic fault on vehicle communication bus B (second physical bus, e.g. body CAN, comfort CAN, or LIN). One or…
Bus B is electrically OK but message rate or error counters are outside spec. Often intermittent wiring or a d…
Bus B high-side line is open — broken wire or disconnected. A communication loss with this module breaks any f…
A control module has counted enough transmit errors to enter the bus-off state defined by ISO 11898 and stops …
Bus B high-side line voltage above expected range — short to power or transceiver fault. A communication loss …
The plus line of vehicle bus D is open. The fault is reported by the gateway when traffic from this segment di…
Bus B low-side line voltage below expected range. A communication loss with this module breaks any function re…
Bus B low-side line voltage above expected range. A communication loss with this module breaks any function re…
The two lines of differential bus B are shorted together. A communication loss with this module breaks any fun…
Generic fault on bus C (third bus, often chassis CAN or diagnostic CAN). A communication loss with this module…
Bus C is electrically OK but message rate or error counters are outside spec. Often intermittent wiring or a d…
Bus C high-side line open. Same diagnostic as U0039 on bus C. A communication loss with this module breaks any…