P2428 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P2428 – Exhaust Gas Temperature Too High Bank 1

 

P2428 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

P2428 Possible Causes

 

Faulty Exhaust Gas Temperature (EGT),Exhaust Gas Temperature (EGT) harness is open or shorted,Exhaust Gas Temperature (EGT) circuit poor electrical connection,Extreme changes in ambient temperature soon after key ON, engine running

 

P2428 Description

 

The Powertrain Control Module (PCM) monitors the Exhaust Gas Temperature (EGT) sensor for a biased signal value. Following an 8-hour soak, the PCM records the EGT sensor temperature value at key ON, engine OFF. After several minutes of vehicle operation at vehicle speeds greater than 40.2 km/h (25 mph) the PCM calculates an expected key ON, engine OFF value. The PCM determines what the expected EGT value at key ON, engine OFF should have been based on inputs from other sensors. The test fails when the difference between the expected calculated value and the actual recorded value is greater than 40?? (72??).