P20E4 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P20E4 – Exhaust Gas Temperature Sensor 2/3 Correlation Bank 1


P20E4 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


P20E4 Possible Causes


Faulty Exhaust Gas Temperature Sensor,Exhaust Gas Temperature Sensor harness is open or shorted,Exhaust Gas Temperature Sensor circuit poor electrical connection,Exhaust leaks,Excessive particulate matter buildup on sensor


P20E4 Description


The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out of range high values. The EGTS is located in front of the Diesel Oxidation Catalyst (DOC) and/or in front of the Diesel Particulate Filter (DPF). The EGTS detects exhaust gas temperature and converts it into a voltage and feeds back to the PCM with the voltage signal in order to control engine conditions to effectively reduce emissions. The PCM sets the P20E4 OBDII code when the Exhaust Gas Temperature Sensor is out of factory specifications.