What does code U0651 mean?

Q: What does code U0651 mean?

Lost Communication With EGR Sensor A. This code means the engine control module has stopped receiving valid data from the exhaust gas recirculation sensor on the 'A' circuit, which is typically the sensor that reports EGR valve position or EGR flow. The module sets the code after detecting missing or implausible messages from that sensor over a defined number of ignition cycles, not necessarily a hard failure of the sensor itself.

DTC codes / U06xx · Network communication / U0651

U0651Lost Communication With EGR Sensor A

This code means the engine control module has stopped receiving valid data from the exhaust gas recirculation sensor on the 'A' circuit, which is typically the sensor that reports EGR valve position or EGR flow. The module sets the code after detecting missing or implausible messages from that sensor over a defined number of ignition cycles, not necessarily a hard failure of the sensor itself.

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.