Exhaust Gas Temperature Too High - Bank 1
The P2428 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Temperature Too High - Bank 1. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $200 - $1500 (parts and labor)
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Common Symptoms
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Burning smell from engine or exhaust area
- Catalytic converter glowing red (visible at night)
- Engine performance severely degraded
Probable Causes (Ranked by Likelihood)
- Engine running extremely rich causing catalyst overheating Very High
- Persistent misfire dumping unburned fuel into exhaust High
- Restricted exhaust causing backpressure Moderate
- Failed exhaust gas temperature sensor reading incorrectly Moderate
Step-by-Step Diagnostic Procedure
-
Check for misfire codes that could be causing unburned fuel in exhaust
-
Monitor exhaust gas temperature with scan tool
-
Inspect exhaust system for restrictions or collapsed pipes
-
Check fuel injectors for leaking or stuck-open conditions
-
Verify the exhaust gas temperature sensor reading against an infrared thermometer
Frequently Asked Questions
Can I drive with code P2428?
No, stop driving immediately. Excessively high exhaust temperatures can cause catalytic converter meltdown and pose a fire risk.
What causes P2428?
Most commonly a persistent misfire or rich-running condition that sends unburned fuel into the exhaust where it ignites in the catalytic converter.
Is P2428 expensive to fix?
Costs range from $200 to $1500. Fix the root cause (misfire or rich condition) first. The catalytic converter may also need replacement if damaged.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P2428 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
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