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Home / DTC / C2237 — Steering Angle Sensor Circuit — Erratic/Intermittent Signal

C2237 — Steering Angle Sensor Circuit — Erratic/Intermittent Signal

Detailed page for trouble code C2237.

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C2237

Generic C — Chassis

Steering Angle Sensor Circuit — Erratic/Intermittent Signal

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

Causes

  • Damaged or pinched wiring in the steering column harness
  • Loose, corroded or contaminated connector terminals
  • Faulty steering angle sensor (internal electronics failure)
  • Poor sensor power supply or ground
  • Water intrusion or contamination at the sensor/connector
  • Intermittent ECU or module fault

Symptoms

  • ABS, ESC/traction control or steering warning lamp illuminated
  • Intermittent or unexpected ESC/ABS interventions
  • Loss of steering angle readout or incorrect steering wheel position displayed
  • Cruise control or lane-keeping assist disabled or operating erratically
  • Steering angle adaptation or calibration errors after wheel alignment/repair

What to check

  • Read stored/freeze-frame codes and live data with a capable scan tool
  • Inspect steering column harness and connectors for damage, corrosion or water
  • Wiggle-test harness/connectors while watching live steering angle signal
  • Verify sensor supply voltage (typically 5 V reference) and ground integrity
  • Backprobe sensor signal pins and observe waveform or voltage levels
  • Check for recent service or aftermarket parts that could affect wiring

Signal parameters

  • Sensor typically provides 2-channel sine/cosine or dual voltage outputs (often 0.5–4.5 V) representing wheel angle
  • Reference supply typically 5 V (verify against manufacturer spec)
  • Signal at steady straight-ahead should be stable DC/constant voltages; values change smoothly when the wheel is turned
  • Erratic/intermittent faults show noisy, jumping, or dropping-to-zero signals, or loss of one channel
  • Some sensors use digital/PWM outputs — check pattern and duty cycle against spec

Diagnostic algorithm

  1. Record codes, freeze frame, and current steering angle/live data. Note conditions when fault set.
  2. Visually inspect sensor, connector, and wiring through the full range of steering travel. Look for chafing, kinks, or pinched wires at clock spring/column.
  3. Check connector terminals for corrosion, bent pins, or poor mating. Clean and securely reconnect.
  4. With scan tool displayed, wiggle harness and column while observing steering angle signal for dropouts or jumps.
  5. Backprobe sensor connector: verify reference voltage (≈5 V), ground continuity, and signal voltages. Compare to expected idle/turn values.
  6. If available, view waveform on oscilloscope to confirm smooth sine/cosine or correct digital pattern; look for noise, missing channel or intermittent bursts.
  7. Perform continuity/resistance tests from sensor pins to the module to detect intermittent opens/shorts. Pay attention to circuits that pass through the clock spring.
  8. If wiring and supplies check good, substitute a known-good sensor or perform bench test per manufacturer procedure.
  9. After repair or replacement clear codes and perform required steering angle sensor calibration/adaptation procedure, then road test to confirm proper operation and that the code does not return.
  10. If intermittent persists and wiring and sensor are good, consider module diagnostics or software updates as the next step.

Likely causes

  • Loose/corroded connector at the steering angle sensor
  • Wiring abrasion or intermittent short/open in column harness
  • Failed steering angle sensor
  • Poor ground or intermittent 5 V reference supply to the sensor

Fault status

⚠️ Status
Stored when the steering angle sensor signal is erratic or intermittent (signal dropouts, excessive noise, or implausible readings). May disable ESC/traction and other driver-assist functions until fault is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

C1236 C1237 C1251 C1229 C2201
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