Chassis, generic

C003B Right Rear Wheel Speed Sensor Supply

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Covers the supply circuit that powers the right rear active wheel speed sensor, completing the supply set with C0032 and C0038. 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. It is distinct from the sensor-signal code C003A in that the fault is on the feed rather than in the sensor element. A fault disables ABS, traction and stability control for that corner and lights the ABS warning lamp while base braking remains. No manufacturer documents this code publicly; NHTSA lists C003B as right rear supply in the J2012 table of its EPS safety report.

Likely causes

Open or shorted sensor supply wire
Corroded connector on the supply side
Module sensor supply output fault

Symptoms

  • ABS warning lamp on
  • ABS and stability control disabled
  • No wheel speed signal from this corner

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–450
Time0.5–2 h

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

Parts involved

rr wsssensor supply

Related codes

C003AC0038C0032

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