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Home / DTC / C0557 — Left Rear Wheel Speed Sensor A Incorrect Component Installed

C0557 — Left Rear Wheel Speed Sensor A Incorrect Component Installed

Detailed page for trouble code C0557.

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Code

C0557

Generic C — Chassis

Left Rear Wheel Speed Sensor A Incorrect Component Installed

Brand: Generic
Type: C — Chassis
Views: UK: 26 EN: 57 RU: 24
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Page language: EN

Causes

  • Incorrect sensor part installed (wrong model, passive vs active, wrong tone ring compatibility)
  • Left rear sensor swapped with another wheel's sensor
  • Aftermarket/incorrect sensor wiring harness adapter used
  • ABS/ESC module programmed for a different sensor type or vehicle option
  • Damaged sensor or internal sensor failure causing abnormal characteristics
  • Corroded or damaged connector/pins causing altered signal

Symptoms

  • ABS warning lamp and/or traction/stability warning illuminated
  • Reduced or disabled ABS/ESC function
  • Possible irregular speed reading for affected wheel in scan tool
  • Brake or stability intervention erratic (pulsing, unexpected ABS activation)
  • Service message related to brake/ESC/ABS

What to check

  • Read freeze frame and live data with a scan tool — confirm left rear wheel speed sensor type and value behavior
  • Visually inspect left rear sensor, connector, wiring and tone ring for damage or contamination
  • Verify sensor part number and compare to manufacturer specification for vehicle VIN
  • Check for swapped sensors by comparing part numbers/resistance/outputs between wheels
  • Measure sensor resistance and compare with spec (passive sensor) or check supply and output (active sensor) with a scope/multimeter
  • Inspect harness repair areas and connector pinouts for miswiring or use of adapters

Signal parameters

  • Passive (magnetic) sensor: DC resistance typically ~500–2000 Ω (varies by manufacturer) — should be stable and within spec
  • Active (Hall/VR with electronics) sensor: typically requires reference supply (usually 5V or vehicle-specific) and produces a square/pulsed voltage signal 0–5V (or 0.5–4.5V) proportional to wheel speed
  • VR-type (variable reluctance) outputs AC sine wave whose frequency and amplitude increase with wheel speed; amplitude may be tens to hundreds of millivolts to several volts depending on speed
  • Signal frequency should rise smoothly with wheel rotation and not drop out or show incorrect polarity compared with expected wheel data
  • Connector pin voltages: check reference, ground and signal per vehicle wiring diagram

Diagnostic algorithm

  1. Connect a capable scan tool, confirm C0557 and note any related ABS/ESC codes; record freeze frame and live wheel speed data.
  2. Visually inspect left rear wheel sensor, tone ring and wiring for damage, contamination, loose connector or corrosion. Repair obvious faults.
  3. Verify the sensor part number against OEM parts list for the vehicle VIN. If suspicious, compare to the other wheel sensors.
  4. With connector disconnected, measure sensor resistance (for passive sensors). Compare to spec. For active sensors, verify supply voltage at the connector with ignition on and check output while spinning the wheel.
  5. If the vehicle has VR-type sensor, use an oscilloscope to confirm expected AC waveform and amplitude while rotating the wheel. For active sensors, confirm correct square/pulse waveform.
  6. Compare left rear sensor waveform/signals to a good wheel (same sensor type) or to manufacturer reference values. If signals differ in type (e.g., active vs passive) the wrong component is likely installed.
  7. Inspect harness pinout and any adapters for miswiring or swapped pins. Confirm continuity between sensor connector and ABS module pins.
  8. If wiring and sensor are correct, verify ABS/ESC module configuration/coding matches vehicle options (wheel size, sensor type). Reprogram if required by manufacturer procedures.
  9. Replace sensor only if part is confirmed incorrect or out of specification. After repair, clear codes and perform a test drive verifying wheel speed readings and that the code does not return.
  10. If fault persists after sensor and wiring verified, consult manufacturer technical service information for module-specific diagnostic tests or consider module fault.

Likely causes

  • Wrong replacement sensor (most common)
  • Sensor swapped with another wheel
  • Aftermarket adapter or incorrect harness wiring
  • Module configuration mismatch after replacement or reflash

Fault status

⚠️ Status
Incorrect left rear wheel speed sensor installed or sensor characteristics do not match expected component type — ABS/ESC may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0035 C0040 C0050 C0057 C0560
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