Exhaust Gas Temperature Too High Bank 1
The P2428 code indicates that the exhaust gas temperature (EGT) sensor on Bank 1 is reporting a temperature that exceeds the maximum allowable threshold. This can be caused by a faulty sensor, wiring issues, or an actual over-temperature condition due to excessive fuel, restricted exhaust, or a malfunctioning diesel particulate filter (DPF) regeneration process. The PCM monitors the EGT to protect the catalytic converter and other exhaust components from thermal damage.
1. Most Common Causes
- Faulty exhaust gas temperature sensor
- Wiring or connector issues in the sensor circuit
- Excessive fuel delivery causing high exhaust temps
- Restricted exhaust system (clogged catalytic converter or DPF)
- Malfunctioning DPF regeneration process
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power
- Increased fuel consumption
- Possible limp mode activation
- Overheating of exhaust components
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Inspect the EGT sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Compare EGT sensor readings with a known good sensor or use a multimeter to test resistance.
Step 4: Check for exhaust restrictions by measuring backpressure with a gauge.
Step 5: Verify DPF regeneration operation and perform forced regeneration if needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code as high exhaust temperatures can damage catalytic converters and other components. If the vehicle enters limp mode, drive to a safe location and have it inspected.
How much does it cost to fix?▼
The cost to fix P2428 typically ranges from $150 to $400, including parts and labor. A new EGT sensor costs $50-$150, and labor adds $100-$250 depending on the vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.