OBD-II code U0652 indicates that a control module (usually the ECM) has lost communication with the EGR sensor 'B' on the vehicle's data network. This sensor is typically a smart sensor or module that reports exhaust gas recirculation position, and the fault means the expected data messages are not being received.
The sensor itself has failed internally and is no longer sending data on the communication bus.
Wiring between the EGR sensor B and the control module is damaged, causing an open or short in the data line.
Corrosion, loose terminals, or a backed-out pin at the sensor connector disrupts communication.
The sensor module is not receiving proper voltage or ground, preventing it from communicating.
The ECM has an internal communication failure, but this is rare and should only be considered after all other causes are ruled out.
It may be possible to drive short distances, but performance issues and limp mode can occur. Prolonged driving may cause further damage or leave you stranded.
No. While a faulty sensor is common, wiring issues, connector problems, or power/ground faults are also frequent causes. The ECM is rarely at fault.
Almost never. ECM replacement is often misdiagnosed for this code. The problem is usually the sensor, wiring, or connector. Only replace the ECM after exhaustive testing proves it is the cause.
It typically refers to a secondary EGR position sensor, often found on engines with dual EGR valves or a second feedback sensor. The exact location varies by vehicle.