C001D code meaning
Right Rear Outlet Control
What C001D means
Covers the right rear outlet (release) solenoid valve of the ABS hydraulic modulator, the release counterpart to inlet valve C001C. It opens to dump brake fluid from the right rear caliper or wheel cylinder into the low-pressure accumulator so pressure can fall during an ABS or stability cycle, then closes for reapply. The module monitors the coil circuit for opens, shorts and out-of-range resistance and checks valve response. A confirmed fault disables ABS, traction and stability control and sets the ABS warning lamp while base hydraulic braking remains available. No manufacturer documents this code publicly; NHTSA's brake study and a pump patent describe the release valve that sits beside each apply valve.
C001D 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 C001D
- ABS warning lamp on
- ABS and stability control disabled
- Normal braking retained
Common causes of C001D
- Most likelyOutlet 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 outlet valve
What each part of C001D means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1D | The exact fault in that area. |
What to do next
- Note C001D 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 C001D
What does C001D mean?
C001D means "Right Rear Outlet Control". Covers the right rear outlet (release) solenoid valve of the ABS hydraulic modulator, the release counterpart to inlet valve C001C. It is a generic code, so it means the same on every make.
Is it safe to drive with C001D?
Drive gently and only to a workshop. With C001D the car can go into limp mode (reduced power) to protect itself.
Will C001D fail an emissions test?
C001D 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 C001D to fix?
Difficulty: workshop only. A typical repair takes 1.5 to 4 hours of work. This is a job for a workshop.
Will C001D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.