Your EGR sensor is sending a signal that's out of range, like a thermostat giving wildly incorrect temperature readings. The engine computer can't properly control exhaust gas recirculation, which helps reduce emissions and manage combustion temperatures.

The ECU monitors the EGR sensor's voltage output to verify exhaust gas flow rate through the EGR valve. The sensor should produce a linear voltage signal within expected operating range. If voltage reads too high, too low, or doesn't change properly, the ECU detects a circuit fault.

Voltage & Parameter Thresholds