P2C81AIR System Pump Overtemperature Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2C81 reports that the secondary air pump on bank 1 has become too hot. The pump is only meant to run for a short time after a cold start, until the catalyst lights off, as Hella describes; a pump with integrated electronics can sense its own temperature and protect its motor. No manufacturer documents P2C81 publicly, so thresholds are unknown; CARB requires monitoring of secondary air delivery. Overheating points to a pump that ran far longer than planned, for example after many short cold starts in a row or with a relay stuck on (P2444), to a blocked intake filter or outlet, to worn bearings that add friction or to water inside the pump. The pump may shut itself off, so no air reaches the exhaust during warm-up and cold-start emissions climb. P2C80 is the overspeed fault, P2C82 the supply fault.
- What you may notice
- Check engine light
- Pump stops early or does not run on the next cold start
- Hot smell or grinding noise from the pump
- Likely causes
- PossiblePump running too long (many short cold starts, relay stuck on)
- PossibleClogged intake filter or blocked outlet path
- PossibleWorn bearings or debris increasing friction
- RareMoisture or condensate inside the pump
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.