Powertrain, generic (extended)

P200E Catalyst System Over Temperature (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Unburnt fuel reaching the catalyst (leaking injector, post injection, misfire)
Parked regeneration with high soot load running too hot
Charge-air duct loose or leaking
Exhaust temperature sensor behind the catalyst faulty

Symptoms

  • Malfunction indicator lamp on
  • Regeneration interrupted, possibly with reduced power
  • Hot smell or heat from the exhaust area

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–3,000
Time1–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

catalytic converterexhaust temperature sensor

Related codes

P200FP200CP2428P2080

References: gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com, static.nhtsa.gov.