C0815Air Suspension Compressor Overtemperature
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0815 has no public owner: code lists and maker indexes skip it, and the NHTSA index only matches it inside unrelated BMW bulletin IDs. The title names thermal protection of the air suspension compressor. Most systems have no temperature sensor and estimate the heat from running time instead. Continental patents describe two strategies: switching the pump off above a calculated limit and back on only when it has cooled enough for one full level change on a loaded vehicle, or pulsing it near the limit so that a lift of 20 to 30 s can still finish. Long lifts at standstill, frequent level corrections, fast off-road driving and heavy sound insulation heat it most; a leak that keeps it running has the same effect.
- What you may notice
- Ride height change stops or is refused for several minutes
- Air suspension warning, vehicle sits low after long standing
- Likely causes
- LikelyLeak in an air spring, line or valve block keeps the compressor running
- PossibleRepeated manual level changes at standstill or heavy load changes
- PossibleWorn or moisture-damaged compressor delivering too little air
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.