What does code U05A8 mean?

Q: What does code U05A8 mean?

Invalid Data Received From NOx Sensor C. U05A8 means the engine control module (ECM) received a data message from the nitrogen oxide (NOx) sensor C that it considers invalid, such as a missing, corrupted, or out-of-range signal. The ECM sets this code when the sensor's internal processing or communication checks fail, not necessarily when the sensor's physical reading is simply high or low.

DTC codes / U05xx · Network communication / U05A8

U05A8Invalid Data Received From NOx Sensor C

U05A8 means the engine control module (ECM) received a data message from the nitrogen oxide (NOx) sensor C that it considers invalid, such as a missing, corrupted, or out-of-range signal. The ECM sets this code when the sensor's internal processing or communication checks fail, not necessarily when the sensor's physical reading is simply high or low.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaNetwork communication

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