What does code U0098 mean?

Q: What does code U0098 mean?

Vehicle Communication Bus H (-) Low. U0098 indicates that the vehicle's communication bus H (-) circuit is reading low voltage, meaning the controller area network (CAN) high-speed negative line is shorted to ground or otherwise pulled below its normal operating range. The powertrain control module (PCM) or another module on that bus has detected the abnormal voltage and stored this code, often disabling communication with other modules.

DTC codes / U00xx · Network wiring and bus faults / U0098

U0098Vehicle Communication Bus H (-) Low

U0098 indicates that the vehicle's communication bus H (-) circuit is reading low voltage, meaning the controller area network (CAN) high-speed negative line is shorted to ground or otherwise pulled below its normal operating range. The powertrain control module (PCM) or another module on that bus has detected the abnormal voltage and stored this code, often disabling communication with other modules.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaNetwork wiring and bus faults

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.