C0038Left Rear Wheel Speed Sensor Supply
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- ABS warning lamp on
- ABS and stability control disabled
- No wheel speed signal from this corner
- Likely causes
- LikelyOpen or shorted sensor supply wire
- PossibleCorroded connector on the supply side
- RareModule sensor supply output fault
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.