C001C code meaning
Right Rear Inlet Control
What C001C means
Covers the right rear inlet (apply) solenoid valve of the ABS hydraulic modulator, the right rear counterpart of C0010 and C0018. The module closes this valve to isolate the right rear brake circuit and hold wheel pressure during ABS, traction or stability control, then opens it to reapply pressure; on the rear axle the same channel often supports electronic brake-force distribution. It monitors the coil for opens, shorts to supply or ground and resistance outside the calibrated range. A confirmed electrical fault disables ABS and stability control and lights the ABS warning lamp while base braking remains. No manufacturer documents this code publicly; the apply valve per wheel is described by NHTSA and in a pump patent.
C001C at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C001C
- ABS warning lamp on
- ABS and stability control disabled
- Normal braking retained
Common causes of C001C
- Most likelyInlet valve coil open or shorted
- PossibleHarness or connector corrosion
- Less likelyInternal hydraulic modulator fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rr ABS inlet valve
What each part of C001C means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1C | The exact fault in that area. |
What to do next
- Note C001C 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 C001C
What does C001C mean?
C001C means "Right Rear Inlet Control". Covers the right rear inlet (apply) solenoid valve of the ABS hydraulic modulator, the right rear counterpart of C0010 and C0018. It is a generic code, so it means the same on every make.
Is it safe to drive with C001C?
Drive gently and only to a workshop. With C001C the car can go into limp mode (reduced power) to protect itself.
Will C001C fail an emissions test?
C001C 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 C001C to fix?
Difficulty: workshop only. A typical repair takes 1.5 to 4 hours of work. This is a job for a workshop.
Will C001C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.