What Does P2428 Mean?
Exhaust gas temperature on Bank 1 exceeds the maximum threshold programmed into the PCM. This condition can damage exhaust components and the catalytic converter.
Safety Warning
Should not be driven extensively. Excessive exhaust temperatures can cause catalyst damage, turbocharger failure, and potential fire hazard.
Common Causes
30%
Engine running excessively lean causing high combustion temps
25%
Failed or restricted EGR system not cooling exhaust
20%
Exhaust restriction causing backpressure and heat buildup
15%
Cooling system malfunction causing overheating
10%
Faulty exhaust temperature sensor giving incorrect readings
Diagnostic Steps
1
Step 1: Check live exhaust temperature sensor data and compare to specifications
2
Step 2: Inspect EGR system operation and verify proper flow and cooling
3
Step 3: Check fuel trims and air/fuel ratio for lean conditions
4
Step 4: Test backpressure in exhaust system to identify restrictions
5
Step 5: Verify engine cooling system is functioning properly and at correct temperature
Estimated Repair Cost
$200 - $2,000
Parts + labor, varies by vehicle and location
Exhaust gas temperature on Bank 1 exceeds the maximum threshold programmed into the PCM. This condition can damage exhaust components and the catalytic converter.
The most common cause of P2428 (Exhaust Gas Temperature Too High Bank 1) is: Engine running excessively lean causing high combustion temps
Typical repair costs for P2428 range from $200 to $2,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Should not be driven extensively. Excessive exhaust temperatures can cause catalyst damage, turbocharger failure, and potential fire hazard.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2428 to identify the root cause.
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Quick Info
Category
Powertrain
System
Exhaust System / Emissions
Difficulty
Type
Generic (SAE)
Recommended Tools
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