Chassis, generic

C003D Rear Wheel Speed Sensor

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Covers a single rear wheel speed sensor on vehicles that use one combined rear speed signal, for example a rear axle or differential-mounted sensor, instead of separate left and right rear sensors. It reports rear 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. A fault disables ABS, traction and stability control and lights the ABS warning lamp while base braking remains. No manufacturer documents this code publicly; NHTSA's EPS safety report carries C003D as the rear wheel speed sensor in its J2012 table.

Likely causes

Rear wheel speed sensor 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

rear wss

Related codes

C003CC003EC0037

References: rosap.ntl.bts.gov, rosap.ntl.bts.gov, en.wikipedia.org.