C0307 code meaning
Inlet Valve Rear Right Performance
What C0307 means
C0307 has no public trace: not in the accessible J2012 lists, not in GM's PIP5094 or AA1Car's GM table, and not in the NHTSA bulletin index. Described here is the rear right inlet valve of the title. In an ESP valve block it does more than ABS work: Saab explains for the 9-5 that both valves of each rear wheel are also driven during stability interventions, so that pressure can be shaped at all four corners while the pump runs. A rear right inlet valve that answers slowly therefore spoils both ABS stops and stability corrections that brake the right rear wheel. The self-test at ignition-on catches coil faults; hydraulic slowness shows up during regulation. Either way ABS and ESP are switched off with their lamps.
C0307 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0307
- ABS and stability control lamps on
- Stability control unavailable
Common causes of C0307
- PossibleRear right inlet valve slowed by dirt or aged fluid
- PossibleCoil of the valve or brake module output defective
- Less likelyPoor contact between brake module and valve block
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rr ABS inlet valveABS hydraulic blockABS control module
What each part of C0307 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 07 | The exact fault in that area. |
What to do next
- Note C0307 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 C0307
What does C0307 mean?
C0307 means "Inlet Valve Rear Right Performance". C0307 has no public trace: not in the accessible J2012 lists, not in GM's PIP5094 or AA1Car's GM table, and not in the NHTSA bulletin index. It is a generic code, so it means the same on every make.
Is it safe to drive with C0307?
Drive gently and only to a workshop. With C0307 the car can go into limp mode (reduced power) to protect itself.
Will C0307 fail an emissions test?
C0307 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 C0307 to fix?
Difficulty: hard. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will C0307 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.