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Home / DTC / C2003 — Steering Angle Sensor Signal Intermittent

C2003 — Steering Angle Sensor Signal Intermittent

Detailed page for trouble code C2003.

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C2003

Generic C — Chassis

Steering Angle Sensor Signal Intermittent

Brand: Generic
Type: C — Chassis
Views: UK: 1 EN: 0 RU: 0
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Page language: EN

Causes

  • Loose, corroded or damaged connector at the SAS
  • Frayed or broken wiring in the steering column harness (intermittent open/short)
  • Faulty steering angle sensor (internal electronics intermittent)
  • Poor sensor ground or disturbed 5 V reference supply
  • CAN/LIN communication errors between SAS module and ABS/ESP module
  • Incorrect or lost sensor calibration (after battery disconnect/repair)

Symptoms

  • Steering angle warning lamp or ABS/ESP warning lamp illuminated
  • Intermittent or unavailable electronic power steering assist
  • Traction control or stability control disabled or performing erratically
  • Stored/secondary DTCs related to ABS, ESP, steering
  • Inconsistent steering angle reading in live data (jumps, dropouts)

What to check

  • Read all stored and freeze-frame codes with a scan tool; note accompanying ABS/ESP/U-codes
  • Monitor steering angle live data while slowly turning wheel; look for dropouts or jumps
  • Perform a wiggle test of the steering column wiring and connectors while watching live data
  • Visually inspect connectors for corrosion, bent pins, water ingress, or pinback
  • Backprobe sensor connector to verify 5 V reference, ground, and signal with key ON
  • Check CAN/LIN bus integrity and presence of SAS messages if the sensor communicates digitally

Signal parameters

  • Supply/reference: typically 5 V reference (verify with vehicle-specific data)
  • Signal types: may be analog voltage (approx. 0.5–4.5 V), dual Hall/AB quadrature outputs, or digital/CAN message depending on vehicle
  • Common absolute angle ranges: up to ±360° or up to ±720° (varies by manufacturer)
  • Typical resolution: 0.1° or finer (manufacturer-specific)
  • If PWM/analog: expect smooth, continuous change in voltage with wheel rotation; intermittent drops to 0 V indicate loss of signal

Diagnostic algorithm

  1. Connect a capable scan tool and record present and pending codes and freeze-frame data. Note any ABS/ESP or network codes.
  2. Monitor SAS live data while performing slow full-range steering wheel rotation. Confirm expected continuous angle values and note any dropouts or sudden jumps.
  3. Visually inspect sensor connector and wiring for damage, corrosion, pin deformation, or water ingress. Repair as needed.
  4. With key ON (engine off), backprobe connector: verify proper 5 V reference, good ground, and a valid signal trace. Use a DMM and oscilloscope if available to detect intermittent faults.
  5. Perform a wiggle test on steering column harness, connector and steering angle sensor while watching live data or scope for intermittent changes.
  6. Check CAN/LIN bus voltage and message presence if the SAS is a network device. Repair bus faults before replacing sensor.
  7. If wiring and connectors test good, replace the SAS module/sensor per manufacturer procedure.
  8. After repair or replacement, perform required steering angle sensor calibration/initialization with a scan tool following vehicle-specific steps.
  9. Clear codes and perform a road test to confirm no recurrence and proper operation of ABS/ESP/power steering systems.

Likely causes

  • Damaged or loose wiring/connectors in the steering column (most common)
  • Intermittent SAS module/sensor failure
  • Poor ground or intermittent 5 V reference to the sensor

Fault status

⚠️ Status
Steering Angle Sensor signal intermittent — possible wiring, connector, sensor, or communication fault; may disable stability/traction or steering-assist systems.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

C2001 C2002 C2004 C2005 C1234
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