C003B

Code

HYUNDAI C — Chassis

Right Rear Wheel Speed Sensor Supply (Subfault)

Brand: HYUNDAI

Type: C — Chassis

Views: UK: 15 EN: 22 RU: 16

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Page language: EN

Causes

Damaged or corroded wiring/connector in the right‑rear wheel speed sensor supply circuit
Loose, corroded or water‑ingressed wheel speed sensor connector
Failed right‑rear wheel speed sensor (Hall effect or VR sensor)
Blown fuse or poor power/ground at the ABS/ESC control unit
Faulty ABS/ESC control module output or internal electronics
Intermittent wiring fault caused by chafing, broken conductor, or pinched harness

Symptoms

ABS warning light and/or ESC/Traction Control lamp illuminated
Intermittent or no wheel speed reading for right‑rear on scan tool
Traction/stability functions disabled or reduced
ABS activation may be unavailable (longer stopping distances in ABS events)
Possible inconsistent speedometer behaviour on some vehicles (rare)
Stored fault(s) related to right‑rear wheel speed circuit

What to check

Retrieve freeze frame and full DTC list with a scan tool; note any related codes
Visually inspect RR wheel speed sensor, connector, and wiring for damage, corrosion or water ingress
Check ABS/ESC fuses and power/ground at control module
Backprobe sensor connector with ignition ON to measure supply/reference voltage and ground
Wiggle harness while monitoring live data or voltage to reproduce intermittent subfault
Measure continuity and resistance between sensor connector and ABS module pins (ignition OFF)

Signal parameters

Hall‑type sensor: reference/supply ≈ 4.5–5.5 V with ignition ON (check factory spec), sensor output: pulsed 0–~5 V while wheel rotates
Passive/VR sensor: no reference voltage; sensor produces an AC voltage that increases with wheel speed (low speed mV range, rising with rpm)
Connector continuity: low ohms (< few ohms) from sensor ground to chassis ground; moderate resistance from sensor signal to ECU per factory spec
Intermittent subfaults often coincide with supply voltage dropouts or fluctuating sensor output on a scope or scan tool

Diagnostic algorithm

Confirm code and check for other related codes. Clear codes and perform a short test drive to see if code returns (note conditions when it returns).
Perform visual inspection of RR sensor, wiring and connector. Look for chafing at suspension joints, inside wheel arch and near the hub.
With connector disconnected, check for corrosion or bent pins. Reconnect and wiggle harness while monitoring live data for the RR wheel speed on a scan tool.
Backprobe the supply/reference pin at the sensor connector with ignition ON. Verify the presence and stability of the reference voltage (typically ≈5 V for Hall sensors) and good ground.
If no reference present at connector, trace and test for continuity and shorts between the module and the sensor connector; inspect/replace any blown fuses and check module power/ground.
If reference is present, spin the wheel (or road test) while monitoring sensor output. For Hall sensors verify pulsed 0–5 V output; for VR verify AC voltage on a scope or multimeter (AC).
If sensor output absent or out of spec, swap with another known‑good wheel sensor (if identical) or temporarily substitute to confirm sensor vs wiring/module fault.
Repair any damaged wiring or connectors (replace pigtail or harness section as required). Replace the sensor if confirmed defective.
After repair, clear codes and re‑test drive to confirm the fault does not return and that ABS/ESC operates normally.

Likely causes

Open or high‑resistance connection on the 5 V reference/supply wire to the RR wheel speed sensor
Short to ground or short to battery on the sensor supply wire
Corroded sensor connector at the hub causing intermittent supply
Failed Hall‑type RR speed sensor that no longer draws/pulls the supply properly
Damaged harness where it bends at the suspension or inside the wheel well

Fault status

⚠️ Status

Right Rear Wheel Speed Sensor Supply (Subfault) — ABS/ESC module detected an abnormal or intermittent supply condition to the right‑rear wheel speed sensor (loss of reference voltage, short, open or high resistance).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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C003B — Right Rear Wheel Speed Sensor Supply (Subfault)