P2429 Possible Causes
- Faulty Exhaust Gas Temperature (EGT)
- Exhaust Gas Temperature (EGT) harness is open or shorted
- Poor electrical connection in the Exhaust Gas Temperature (EGT) circuit
- Extreme ambient temperature changes shortly after turning key ON, engine running
How to Fix Code P2429
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P2429
Symptoms
Possible
Illuminated engine light (or service engine soon warning light)
P2429 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).