P200ECatalyst System Over Temperature (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
- P200E means the catalyst on bank 1 has run hotter than its design limit. On diesels this is the oxidation catalyst ahead of the particulate filter. GM reads the sensor behind the close-coupled DOC and stores a Type A code above 850 °C in its 2020 table and above 800 °C in 2025, each confirmed over hundreds of samples. Ford's 2023 diesels tie it to the filter check instead: P200E follows once the P200C condition has lasted 3 s while the vehicle stands still, in other words a parked regeneration that overheats. Heat comes from unburnt fuel reaching the catalyst, for instance leaking injectors, excessive post injection or misfire, from a soot-laden filter, or from charge-air leaks, which GM cites in PIP5468 for the 2017–2018 L5P. CARB does not accept overtemperature records as a catalyst health check, so conversion is judged separately.
- What you may notice
- Malfunction indicator lamp on
- Regeneration interrupted, possibly with reduced power
- Hot smell or heat from the exhaust area
- Likely causes
- LikelyUnburnt fuel reaching the catalyst (leaking injector, post injection, misfire)
- PossibleParked regeneration with high soot load running too hot
- PossibleCharge-air duct loose or leaking
- RareExhaust temperature sensor behind the catalyst faulty
- 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.