P2428Exhaust Gas Temperature Too High (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2428 is a protection code: the exhaust on bank 1 has become hot enough to endanger the aftertreatment, above all the diesel particulate filter. GM's 2014 diesel tables (14OBDG04) list five triggers, any of which fails the test after 6 seconds: about 800 °C ahead of the oxidation catalyst, 900 °C behind it, 800 °C behind the filter, or rises of more than 600 °C across the catalyst and 400 °C across the filter. The fault is Type A, so the lamp comes on at once. The usual origin is an uncontrolled soot burn in the filter, late fuel injected during regeneration or a leaking injector. CARB requires plausible EGT sensors, so a faulty sensor must be ruled out first. Engine power is usually limited.
- What you may notice
- Warning lamp on immediately, often with reduced power
- Strong heat or burning smell from the exhaust
- Particulate filter or catalyst damage in severe cases
- Likely causes
- LikelyUncontrolled soot burn in an overloaded particulate filter
- PossibleLeaking injector or excessive post-injection reaching the catalyst
- PossibleExhaust temperature sensor reading too high
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.