What does code U05A2 mean?

Q: What does code U05A2 mean?

NOx Sensor B Received Invalid Data From ECM/PCM. This code means the engine control module (ECM) or powertrain control module (PCM) has received data from a nitrogen oxide (NOx) sensor that it considers invalid or out of range. The NOx sensor is reporting a signal the computer cannot trust, so it flags the communication as faulty rather than a simple sensor failure.

DTC codes / U05xx · Network communication / U05A2

U05A2NOx Sensor B Received Invalid Data From ECM/PCM

This code means the engine control module (ECM) or powertrain control module (PCM) has received data from a nitrogen oxide (NOx) sensor that it considers invalid or out of range. The NOx sensor is reporting a signal the computer cannot trust, so it flags the communication as faulty rather than a simple sensor failure.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

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.