C0317 code meaning
Compressor Relay Circuit
What C0317 means
C0317 is publicly undocumented: it is missing from every publicly available J2012 list, from GM's keyword bulletin PIP5094 and from the whole NHTSA bulletin index. What follows describes only the part named in the title. On air or self-levelling suspension a relay carries the heavy compressor current and is energised by the suspension module. Land Rover ships the compressor relay together with the replacement compressor for the 2010 Range Rover, whose compressor could fail by running too long. Audi has technicians open relay J403 of the self-levelling compressor on A6 and Q7 models and judge its contacts: burnt contacts mean compressor and relay are both renewed. Volvo checks fuse and relay before it blames the compressor. A circuit fault here leaves the vehicle unable to raise or hold its ride height.
C0317 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0317
- Suspension warning or air suspension fault message
- Vehicle sits low and does not rise
- Compressor runs constantly or never starts
Common causes of C0317
- Most likelyRelay contacts burnt or welded by a compressor drawing too much current
- PossibleOpen or shorted control line between suspension module and relay coil
- PossibleWorn or seized compressor overloading the relay
- Less likelyBlown compressor fuse or corroded relay socket
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Compressor relayAir compressorAir suspension moduleRelay wiring
What each part of C0317 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 17 | The exact fault in that area. |
What to do next
- Note C0317 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 C0317
What does C0317 mean?
C0317 means "Compressor Relay Circuit". C0317 is publicly undocumented: it is missing from every publicly available J2012 list, from GM's keyword bulletin PIP5094 and from the whole NHTSA bulletin index. It is a generic code, so it means the same on every make.
Is it safe to drive with C0317?
Drive gently and only to a workshop. With C0317 the car can go into limp mode (reduced power) to protect itself.
Will C0317 fail an emissions test?
C0317 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 C0317 to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will C0317 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.