P040C – Exhaust Gas Recirculation Temperature Sensor ‘A’ Circuit Low

P040C Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P040C Possible Causes

Faulty Exhaust Gas Recirculation Temperature Sensor ‘A’,Exhaust Gas Recirculation Temperature Sensor ‘A’ harness is open or shorted,Exhaust Gas Recirculation Temperature Sensor ‘A’ circuit poor electrical connection

P040C Description

The Engine Control Module (ECM) monitors the Exhaust Gas Recirculation (EGR) Temperature Sensor ‘A’ Circuit Performance, which measures the temperature of the exhaust gas. The EGR Temperature Sensor functions by increasing the resistance with increasing exhaust gas temperature. The ECM sets the OBDII code when the EGR Temperature Sensor signal is not to factory specifications.