Chassis, generic

C0036 Left Rear Tone Wheel

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Covers the left rear tone wheel (reluctor or encoder ring) read by the left rear wheel speed sensor, the rear-axle counterpart of C0030 and C0033. It is a signal-plausibility code set when the module sees an erratic, noisy or intermittent rear speed signal consistent with a damaged, contaminated or loose tone ring rather than a sensor circuit failure. Ford documents C0036 with C0037 and C003A on 2021 Bronco and Ranger vehicles with an illuminated ABS warning. A fault disables ABS, traction and stability control and lights the ABS warning lamp while base braking remains; on vehicles that use the rear sensors for electronic brake-force distribution that function is affected too.

Likely causes

Damaged or contaminated tone ring
Loose or displaced hub bearing
Excessive sensor-to-ring air gap

Symptoms

  • ABS warning lamp on
  • ABS and stability control disabled
  • Grinding noise from wheel hub

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–700
Time0.8–2.5 h

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

Parts involved

lr tone wheel

Related codes

C0037C0030C0039

References: static.nhtsa.gov, en.wikipedia.org.