C0038 code meaning
Left Rear Wheel Speed Sensor Supply
What C0038 means
Covers the supply circuit that powers the left rear active wheel speed sensor, the rear-axle counterpart of C0032. Active sensors need a regulated voltage from the ABS/ESC module; this code is set when that supply is open, shorted to ground or to another voltage, or outside the regulated range so the sensor cannot produce a valid signal. Ford lists C0038 with C0037 on 2020-2022 F-53 and F-59 chassis where a bent or damaged sensor and its circuit set an ABS light. A fault disables ABS, traction and stability control for that corner and lights the ABS warning lamp while base braking remains; it is distinct from the sensor-signal code C0037 in that the feed itself is faulty.
C0038 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 C0038
- ABS warning lamp on
- ABS and stability control disabled
- No wheel speed signal from this corner
Common causes of C0038
- Most likelyOpen or shorted sensor supply wire
- PossibleCorroded connector on the supply side
- Less likelyModule sensor supply output fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Lr wssSensor supply
What each part of C0038 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 38 | The exact fault in that area. |
What to do next
- Note C0038 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 C0038
What does C0038 mean?
C0038 means "Left Rear Wheel Speed Sensor Supply". Covers the supply circuit that powers the left rear active wheel speed sensor, the rear-axle counterpart of C0032. It is a generic code, so it means the same on every make.
Is it safe to drive with C0038?
Drive gently and only to a workshop. With C0038 the car can go into limp mode (reduced power) to protect itself.
Will C0038 fail an emissions test?
C0038 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 C0038 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 C0038 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.