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
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.
Mechanics Guide Step-by-step diagnosis
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
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
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:
Commonly Affected Vehicles
- 2010-2018 Volkswagen Jetta TDI
- 2012-2020 BMW 328d
- 2011-2019 Ford F-250 Diesel
- 2013-2021 Chevrolet Silverado Diesel
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