Code
C1340
HYUNDAI
C — Chassis
Steering Angle Sensor Circuit Malfunction
Views:
UK: 13
EN: 25
RU: 17
AI status
Completed
Completed
100%
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
- Retrieve and record all related DTCs and live data (steering angle, wheel speeds, yaw rate).
- With ignition ON, verify SAS supply voltage and ground at the sensor connector. Replace or repair if supply is missing or out of range.
- 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.
- 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.
- If vehicle uses a clock spring, check for continuity of signal circuits through the clock spring; replace if faulty or noisy.
- 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.
- 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.
- 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
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