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Home / DTC / C1340 — Steering Angle Sensor Circuit Malfunction

C1340 — Steering Angle Sensor Circuit Malfunction

Detailed page for trouble code C1340.

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C1340

HYUNDAI C — Chassis

Steering Angle Sensor Circuit Malfunction

Brand: HYUNDAI
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed steering angle sensor (SAS)
  • Open, shorted, or corroded wiring/connectors between SAS and ABS/ESC module
  • Faulty clock spring (spiral cable) in steering column
  • Poor ground or lost reference/power supply to the sensor
  • ABS/ESC control module fault or internal failure
  • Sensor not calibrated after repairs or battery disconnection

Symptoms

  • ABS, ESC (VDC), or traction control dash warning lamp illuminated
  • Loss of vehicle stability control intervention (ESC inactive)
  • Steering angle readout incorrect or shows extreme values in scan tool
  • Possible reduced braking stability in emergency maneuvers
  • Intermittent warnings depending on steering angle or vibration

What to check

  • Connect a capable scan tool, read freeze frames and live data for steering angle and wheel speeds
  • Note whether SAS value follows steering input (check center position and full lock values)
  • Check for additional codes (communication or ABS module errors)
  • Visually inspect wiring and connectors at steering angle sensor, steering column, and ABS/ESC module
  • Check power and ground at the SAS connector (typically +5V ref, ground, and signal)
  • Perform a wiggle test of wiring and connectors while monitoring live data for changes

Signal parameters

  • Supply/reference voltage: typically ~5 V (verify with vehicle-specific data)
  • Signal voltage (analog sensors): commonly centered ~2.5 V at straight-ahead, varies toward 0.5–4.5 V at extremes (vehicle dependent)
  • Digital/CAN sensors: steering angle reported as degrees via CAN/serial messages; value should move smoothly and return to near 0° at center
  • Typical rotation range: up to ±540° to ±720° total depends on rack travel and sensor design
  • No sudden jumps, frozen values, or implausible angles relative to wheel position/wheel speed sensors

Diagnostic algorithm

  1. Retrieve and record all related DTCs and live data (steering angle, wheel speeds, yaw rate).
  2. With ignition ON, verify SAS supply voltage and ground at the sensor connector. Replace or repair if supply is missing or out of range.
  3. Observe steering angle live data while turning the wheel slowly from lock to lock. Confirm smooth response and correct center reference. If signal is intermittent or incorrect, suspect sensor, wiring, or clock spring.
  4. Inspect and repair any damaged/shorted/chafed wiring and connectors from the sensor to the ABS/ESC module. Perform continuity and resistance checks to the module pins.
  5. If vehicle uses a clock spring, check for continuity of signal circuits through the clock spring; replace if faulty or noisy.
  6. If wiring and power/ground are good but signal remains incorrect, replace the steering angle sensor. After replacement, perform SAS calibration/initialization with a scan tool per manufacturer procedure.
  7. Clear codes and test drive to confirm the code does not return and that ESC/ABS warnings are extinguished. Monitor live data and perform a stability control self-test if available.
  8. If code persists after sensor replacement and wiring verified, consider diagnosis of the ABS/ESC control module or module CAN/communication faults.

Likely causes

  • Wiring harness chafe or connector corrosion at steering column
  • Clock spring wear causing intermittent signal or short
  • SAS failure due to internal electronics or physical damage
  • Loss of 5V reference or ground from ABS/ESC module
  • Missing or incorrect SAS calibration after replacement or steering work

Fault status

⚠️ Status
Steering Angle Sensor circuit malfunction detected — check sensor, wiring/connectors, clock spring, and perform SAS calibration after repairs.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C1310 C1330 C1341 U0121 U0155
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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Code

C1340

MITSUBISHI C — Chassis

Stop lamp switch

Brand: MITSUBISHI
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed steering angle sensor (SAS)
  • Open, shorted, or corroded wiring/connectors between SAS and ABS/ESC module
  • Faulty clock spring (spiral cable) in steering column
  • Poor ground or lost reference/power supply to the sensor
  • ABS/ESC control module fault or internal failure
  • Sensor not calibrated after repairs or battery disconnection

Symptoms

  • ABS, ESC (VDC), or traction control dash warning lamp illuminated
  • Loss of vehicle stability control intervention (ESC inactive)
  • Steering angle readout incorrect or shows extreme values in scan tool
  • Possible reduced braking stability in emergency maneuvers
  • Intermittent warnings depending on steering angle or vibration

What to check

  • Connect a capable scan tool, read freeze frames and live data for steering angle and wheel speeds
  • Note whether SAS value follows steering input (check center position and full lock values)
  • Check for additional codes (communication or ABS module errors)
  • Visually inspect wiring and connectors at steering angle sensor, steering column, and ABS/ESC module
  • Check power and ground at the SAS connector (typically +5V ref, ground, and signal)
  • Perform a wiggle test of wiring and connectors while monitoring live data for changes

Signal parameters

  • Supply/reference voltage: typically ~5 V (verify with vehicle-specific data)
  • Signal voltage (analog sensors): commonly centered ~2.5 V at straight-ahead, varies toward 0.5–4.5 V at extremes (vehicle dependent)
  • Digital/CAN sensors: steering angle reported as degrees via CAN/serial messages; value should move smoothly and return to near 0° at center
  • Typical rotation range: up to ±540° to ±720° total depends on rack travel and sensor design
  • No sudden jumps, frozen values, or implausible angles relative to wheel position/wheel speed sensors

Diagnostic algorithm

  1. Retrieve and record all related DTCs and live data (steering angle, wheel speeds, yaw rate).
  2. With ignition ON, verify SAS supply voltage and ground at the sensor connector. Replace or repair if supply is missing or out of range.
  3. Observe steering angle live data while turning the wheel slowly from lock to lock. Confirm smooth response and correct center reference. If signal is intermittent or incorrect, suspect sensor, wiring, or clock spring.
  4. Inspect and repair any damaged/shorted/chafed wiring and connectors from the sensor to the ABS/ESC module. Perform continuity and resistance checks to the module pins.
  5. If vehicle uses a clock spring, check for continuity of signal circuits through the clock spring; replace if faulty or noisy.
  6. If wiring and power/ground are good but signal remains incorrect, replace the steering angle sensor. After replacement, perform SAS calibration/initialization with a scan tool per manufacturer procedure.
  7. Clear codes and test drive to confirm the code does not return and that ESC/ABS warnings are extinguished. Monitor live data and perform a stability control self-test if available.
  8. If code persists after sensor replacement and wiring verified, consider diagnosis of the ABS/ESC control module or module CAN/communication faults.

Likely causes

  • Wiring harness chafe or connector corrosion at steering column
  • Clock spring wear causing intermittent signal or short
  • SAS failure due to internal electronics or physical damage
  • Loss of 5V reference or ground from ABS/ESC module
  • Missing or incorrect SAS calibration after replacement or steering work

Fault status

⚠️ Status
Steering Angle Sensor circuit malfunction detected — check sensor, wiring/connectors, clock spring, and perform SAS calibration after repairs.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C1310 C1330 C1341 U0121 U0155
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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