Chassis, generic

C0037 Left Rear Wheel Speed Sensor

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Covers the left rear wheel speed sensor and its circuit, the rear-axle counterpart of C0031 and C0034. 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 C0037 on 2020-2022 F-53 motorhome and F-59 commercial chassis, frequently caused by a bent or damaged sensor, and lists it with C003A/C0036 on 2021 Bronco and Ranger. A fault disables ABS, traction and stability control and lights the ABS warning lamp while base braking remains.

Likely causes

Wheel speed sensor bent or failed
Open, shorted or chafed sensor wiring
Corroded sensor connector

Symptoms

  • ABS warning lamp on
  • ABS and stability control disabled
  • Speedometer may read erratically

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–400
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

lr wss

Related codes

C0036C0038C003A

References: static.nhtsa.gov, static.nhtsa.gov.