P2428 Possible Causes
- Faulty Exhaust Gas Temperature (EGT) sensor
- Exhaust Gas Temperature (EGT) circuit wiring open or shorted
- Poor electrical connection in Exhaust Gas Temperature (EGT) circuit
- Extreme ambient temperature changes shortly after turning key ON, engine running
How to Fix Code P2428
Check the “Possible Causes” listed above. Visually inspect related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P2428 Possible Symptoms
Illuminated engine light (or service engine soon warning light)
P2428 Meaning
The Powertrain Control Module (PCM) monitors the Exhaust Gas Temperature (EGT) sensor for a biased signal value. After an 8-hour soak, the PCM records the EGT sensor temperature value at key ON, engine OFF. After several minutes of vehicle operation at speeds above 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°C (72°F).