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Home / DTC / C1550 — ABS/TCS wheel speed sensor circuit — left rear

C1550 — ABS/TCS wheel speed sensor circuit — left rear

Detailed page for trouble code C1550.

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C1550

Generic C — Chassis

ABS/TCS wheel speed sensor circuit — left rear

Brand: Generic
Type: C — Chassis
Views: UK: 6 EN: 4 RU: 4
AI status
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Page language: EN

Causes

  • Open or short in left rear wheel speed sensor wiring
  • Corroded or loose connector at sensor or ABS module
  • Faulty left rear wheel speed sensor (Hall or VR type)
  • Damaged or missing tone ring/tooth on wheel bearing/hub
  • Excessive sensor air gap or misalignment
  • Contamination (metal shavings, rust, brake dust) on sensor or ring

Symptoms

  • ABS warning light illuminated
  • TCS/ESC/Traction control warning light illuminated or functionality reduced
  • Loss of ABS or traction control operation for left rear wheel
  • Intermittent or constant fault code stored for left rear wheel
  • Possible speedometer/odometer irregularities on some vehicles
  • Possible wheel lock/pulsation during ABS events

What to check

  • Read freeze frame and live-data with a scan tool; monitor all wheel speed sensors while rotating wheels
  • Visually inspect left rear sensor, connector, tone ring, and wiring harness for damage or contamination
  • Check connector pins for corrosion, bent pins, or poor contact; reseat and inspect
  • Perform resistance and/or output voltage check at the sensor (compare to spec or another wheel sensor)
  • Check for continuity and shorts between sensor wires and chassis/ignition power using multimeter
  • Check reference voltage and ground at the sensor connector for active (Hall) sensors

Signal parameters

  • Passive (VR) sensor: AC voltage output increases with wheel speed; low-speed output may be a few hundred mV, rising to several volts at higher speed; frequency proportional to speed
  • Active (Hall/TTL) sensor: Square wave or digital pulse signal, typically 0–5 V (or 0–12 V on some systems) centered on reference voltage; frequency proportional to wheel speed
  • Typical resistance (VR) sensors: often a few hundred to a few thousand ohms — consult vehicle spec
  • Reference voltage for active sensors: commonly ~5 V; verify at harness connector with ignition ON
  • Expected continuity: low ohms between sensor ground and chassis ground; no short to power

Diagnostic algorithm

  1. Connect a scan tool, record freeze frame and live data for all wheel speed sensors; note if left rear is zero, noisy, or out of range.
  2. Perform a visual inspection of left rear sensor, connector, wiring, and tone ring. Repair or clean any obvious damage or contamination.
  3. With ignition ON (engine off) unplug the left rear sensor and inspect pins for corrosion or damage; reconnect securely.
  4. Measure sensor resistance (for VR) or check reference voltage and ground (for active sensors) at the harness connector; compare to spec or a good sensor.
  5. Rotate the wheel and observe sensor output: AC voltage/frequency for VR or digital pulses for Hall sensors. Replace sensor if no valid signal.
  6. Perform continuity check from sensor connector to ABS module connector to identify open or short circuits; repair wiring as needed.
  7. If intermittent, wiggle harness and suspension while monitoring live data to locate intermittent breaks; repair or replace damaged sections.
  8. Inspect tone ring for missing/bent teeth or heavy rust; replace tone ring or hub assembly if damaged.
  9. If wiring and sensor test good, check ABS module inputs and grounds; test or replace ABS module if internal fault is suspected.
  10. After repairs, clear codes and road-test to confirm no recurrence and proper ABS/TCS operation.

Likely causes

  • Connector corrosion or water ingress at left rear sensor
  • Broken wire between sensor and ABS module due to suspension movement
  • Sensor damaged during brake or hub service
  • Debris or rust on tone ring causing no or noisy signal
  • Sensor gap too large after incorrect installation

Fault status

⚠️ Status
Left rear wheel speed sensor circuit fault detected by ABS/TCS control; system may disable ABS/traction control for affected wheel and illuminate warning lamps.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0035 C0040 C0045 C0050 C1551 P0500
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