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Home / DTC / C2555 — Steering Angle Sensor Circuit Malfunction

C2555 — Steering Angle Sensor Circuit Malfunction

Detailed page for trouble code C2555.

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C2555

Generic C — Chassis

Steering Angle Sensor Circuit Malfunction

Brand: Generic
Type: C — Chassis
Views: UK: 3 EN: 7 RU: 3
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Page language: EN

Causes

  • Open, short or intermittent wiring between SAS and control module
  • Corroded, loose or damaged connector or pin at sensor or module
  • Failed steering angle sensor (internal electronics)
  • Loss of sensor supply voltage or ground (blown fuse, poor ground)
  • CAN bus or module communication fault preventing valid angle data
  • Steering column mechanical damage, sensor misalignment or slipped tone ring

Symptoms

  • ABS / ESC / Stability control warning lamp illuminated
  • Steering/traction assist reduced or unavailable; loss of normal steering feel
  • Steering angle readout incorrect or not updating on diagnostic scan tool
  • Cruise control or advanced driver assist features disabled
  • Intermittent or permanent fault codes stored; possible limp or safe mode

What to check

  • Read and record all fault codes and freeze-frame data with a capable scan tool
  • Verify live steering angle value while turning wheel; check for smooth, proportional change
  • Compare steering wheel angle vs wheel position (turn wheel clockwise/counterclockwise)
  • Inspect sensor connector and wiring for corrosion, bent pins, chafing, or disconnection
  • Check applicable fuses and measure sensor supply voltage and ground at the connector
  • Check for related network communication codes (U-codes) indicating module loss

Signal parameters

  • Sensor supply: typically 5 V reference (verify with vehicle-specific data)
  • Signal output (analog sensors): commonly ~0.5–4.5 V range proportional to angle; should change smoothly as wheel turns
  • Digital/CAN: steering angle reported as signed degrees (range depends on manufacturer, often +/- 540° or +/- 720°) at regular update rate (e.g., 10–100 Hz)
  • Resistance: some sensors include resistive elements—check service data for expected ohms between pins
  • Expected idle/center value: vehicle-specific; many systems have a defined center reading that must be matched during calibration

Diagnostic algorithm

  1. Connect a diagnostic scanner capable of reading steering angle and stability module data. Record stored codes and freeze frame.
  2. Clear code and attempt to re-create the fault. Monitor live steering angle value while turning the wheel slowly and rapidly; note any dropouts, jumps, or implausible values.
  3. Visually inspect the sensor, connector, and wiring from the steering column to the control module. Repair any damaged wiring, pins or corrosion.
  4. With ignition on, verify sensor supply voltage and ground at the connector using a multimeter. Compare to vehicle service specifications.
  5. Probe the signal line with an oscilloscope or multimeter while turning the wheel; confirm the signal varies smoothly and without noise or intermittent loss.
  6. If signal is absent or incorrect, check for continuity between sensor and module. Repair any short/open faults before replacing modules.
  7. If wiring and power/ground are good but signal remains invalid, replace the steering angle sensor per manufacturer procedure.
  8. After replacement or repair, perform required steering angle sensor relearn/calibration procedure using a scan tool. Verify values at center and at turns.
  9. Recheck for codes and perform a road test to confirm ABS/ESC and steering assist functions are normal and no fault returns.
  10. If fault persists, investigate communication network (CAN) and related modules (ABS/ESP, power steering control) for internal faults or software updates/TSBs.

Likely causes

  • Poor connector/ground or damaged wiring at the sensor (most common)
  • Sensor failure or internal intermittent
  • Missing or incorrect SAS calibration after repair
  • Communication loss with ABS/ESP module (module or CAN bus issue)

Fault status

⚠️ Status
Steering Angle Sensor Circuit Malfunction — invalid, missing or implausible steering angle signal or communication to control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

C2550 C2551 C2556 C0035 C0040 U0121
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