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Home / DTC / C2403 — Steering Angle Sensor Circuit — Intermittent/Erratic Signal

C2403 — Steering Angle Sensor Circuit — Intermittent/Erratic Signal

Detailed page for trouble code C2403.

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C2403

Generic C — Chassis

Steering Angle Sensor Circuit — Intermittent/Erratic Signal

Brand: Generic
Type: C — Chassis
Views: UK: 1 EN: 2 RU: 2
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Page language: EN

Causes

  • Damaged, chafed or corroded wiring in the SAS circuit
  • Loose or poor connector pins at the sensor or ECU
  • Water intrusion or corrosion in connector or sensor housing
  • Intermittent power or ground to the sensor (bad ground, fused link, battery/charging issues)
  • Failing or internally intermittent steering angle sensor
  • Physical steering-column damage or sensor mis‑mounting/loosened bracket

Symptoms

  • ABS, ESC, traction control or EPS warning light illuminated (sometimes intermittently)
  • Intermittent or incorrect steering angle readout in scan tool live data
  • Unexpected ABS/ESC interventions or reduced stability control functionality
  • Steering-related warnings during start-up or after wheel movement
  • Unable to perform or retain SAS zero/learn calibration
  • Vehicle pulling or unusual steering behavior reported by stability control systems

What to check

  • Read and record all stored codes and freeze-frame data with a capable scan tool
  • Check for related communication codes (U-codes) and multiple SAS codes
  • Visually inspect sensor connector and wiring for corrosion, damage, pin push‑back or water intrusion
  • Perform a wiggle test on the harness and connector while observing live SAS data for signal dropouts
  • Verify battery voltage and charging system stability during test drive or while exercising steering
  • Check sensor mounting and steering column for excessive play or misalignment

Signal parameters

  • Typical SAS signal types: analog 0–5 V, PWM, or digital/CAN message (vehicle dependent)
  • Reference voltage usually ~5.0 V (check manufacturer spec) and stable with engine on and cranking
  • Signal update rate commonly 5–100 Hz; steering angle reported in degrees (signed or 0–360° depending on supplier)
  • Noisy or intermittent waveform on signal line when viewed with oscilloscope indicates wiring or sensor issue
  • Continuity/low resistance expected between sensor ground and chassis ground (near 0 Ω)

Diagnostic algorithm

  1. Connect a full-function scan tool; record C2403 plus related codes and live steering angle data at rest, full-left and full-right steering. Save freeze-frame if present.
  2. Visually inspect sensor, connector and wiring harness (steering column to ECU). Look for corrosion, bent pins, water entry, chafing or pinched wires.
  3. With ignition on, monitor reference voltage and signal at the sensor connector (back-probe). Confirm stable reference (≈5 V) and ground. Compare to manufacturer values.
  4. Wiggle the harness and connector while monitoring live data to reproduce intermittent behavior. If signal changes, suspect wiring/connector.
  5. If available, use an oscilloscope to view the signal for noise, dropouts or erratic waveform. Analog/PWM anomalies usually indicate sensor or harness problems.
  6. Inspect and test continuity from sensor pins to the ECU connector; repair any high resistance or intermittent connections.
  7. Repair or replace damaged wiring, connectors or the sensor as indicated. Clean and secure all connections; protect harness from rubbing or moisture.
  8. After repair or replacement, perform SAS zero-point/angle learn procedure per manufacturer instructions (required on many vehicles).
  9. Clear codes, perform system relearn/calibration, then road-test while monitoring live SAS and ABS/ESC behavior. Re-scan to confirm code does not return.
  10. If intermittent persists and wiring is confirmed good, consider ECU/CAN network fault and consult vehicle-specific service information or technical service bulletins.

Likely causes

  • Loose or corroded connector at the steering angle sensor
  • Chafed/broken wire in the harness to the sensor (pin-to-pin intermittent)
  • Failed steering angle sensor element (intermittent internal electronics)
  • Poor ground or unstable reference voltage to the sensor
  • Water ingress/corrosion in the connector or sensor housing

Fault status

⚠️ Status
Intermittent/erratic steering angle sensor signal detected. Code set when the sensor output is noisy, out of expected range, or intermittently inconsistent with vehicle motion or other sensors; may be stored with related ABS/ESC or communication codes.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

C2400 C2401 C2402 C2404 U0416 U0121
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