C0815 code meaning
Air Suspension Compressor Overtemperature
What C0815 means
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.
C0815 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0815
- Ride height change stops or is refused for several minutes
- Air suspension warning, vehicle sits low after long standing
Common causes of C0815
- Most 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
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Air compressorAir linesAir springs
What each part of C0815 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 15 | The exact fault in that area. |
What to do next
- Note C0815 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C0815
What does C0815 mean?
C0815 means "Air Suspension Compressor Overtemperature". C0815 has no public owner: code lists and maker indexes skip it, and the NHTSA index only matches it inside unrelated BMW bulletin IDs. It is a generic code, so it means the same on every make.
Is it safe to drive with C0815?
Drive gently and only to a workshop. With C0815 the car can go into limp mode (reduced power) to protect itself.
Will C0815 fail an emissions test?
C0815 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C0815 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will C0815 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.