C003A code meaning
Right Rear Wheel Speed Sensor
What C003A means
Covers the right rear wheel speed sensor and its circuit, completing the four-corner sensor set with C0031, C0034 and C0037. The active sensor reports rear wheel rotation to the ABS/ESC module for anti-lock, traction and stability control and electronic brake-force distribution. The module monitors the circuit for opens, shorts to power or ground, a signal outside the valid range and a missing signal while moving. Ford documents C003A with C0036 and C0037 on 2021 Bronco and Ranger vehicles built in a specific window, with an illuminated ABS warning. A fault disables ABS, traction and stability control and lights the ABS warning lamp while base braking remains available.
C003A at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C003A
- ABS warning lamp on
- ABS and stability control disabled
- Speedometer may read erratically
Common causes of C003A
- Most likelyWheel speed sensor bent or failed
- PossibleOpen, shorted or chafed sensor wiring
- Less likelyCorroded sensor connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rr wss
What each part of C003A means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 3A | The exact fault in that area. |
What to do next
- Note C003A 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 C003A
What does C003A mean?
C003A means "Right Rear Wheel Speed Sensor". Covers the right rear wheel speed sensor and its circuit, completing the four-corner sensor set with C0031, C0034 and C0037. It is a generic code, so it means the same on every make.
Is it safe to drive with C003A?
Drive gently and only to a workshop. With C003A the car can go into limp mode (reduced power) to protect itself.
Will C003A fail an emissions test?
C003A 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 C003A to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will C003A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.