C2570

Code

Generic C — Chassis

Steering Angle Sensor — Implausible Signal

Brand: Generic

Type: C — Chassis

Views: UK: 0 EN: 0 RU: 2

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty steering angle sensor
Open, shorted, chafed, or corroded wiring/connectors between sensor and control module
Poor sensor power supply or ground
Loss of CAN/communication with ABS/ESP module
Incorrect or missing steering angle sensor calibration (relearn)
Mechanical damage or excessive play in the steering column or coupling

Symptoms

ESP/ABS/Traction control warning lamp illuminated
Steering/vehicle stability systems disabled or limited
Steering angle display incorrect or steering wheel position not remembered
Adaptive features (lane keep, torque assist) behaving poorly or unavailable
Possible diagnostic trouble codes in ABS/ESP modules or loss of communication codes

What to check

Retrieve all stored codes and freeze-frame data from chassis/ABS/ESP modules
Verify battery voltage is stable (typically 12–14.5 V) during tests
Inspect sensor connector for corrosion, bent pins, water ingress, or loose terminals
Visually inspect wiring harness along the steering column for chafe or damage
Check for related CAN/communication or wheel speed sensor codes
Compare live steering angle data to physical steering wheel position (with wheels straight and when turning)

Signal parameters

Reported steering angle: typical range -540° to +540° (varies by vehicle); center ≈ 0°
Sensor output types: analog voltage (commonly 0.5–4.5 V) or digital via SPI/I2C/CAN
Reference/power supply: commonly 5 V or 3.3 V (verify for vehicle)
Update rate: typically 10–100 Hz for live CAN messages
Yaw rate/wheel speed correlation: steering angle should be consistent with yaw rate and wheel speed sensors during turning
Expected idle/center value: stable near center value with low noise and no rapid jumps

Diagnostic algorithm

Safety: Park vehicle, chock wheels, follow OEM safety procedures for steering/airbag work.
Read codes: Use a capable scan tool to read DTCs from ABS/ESP and body modules; note freeze-frame and related codes.
Verify power/ground: With ignition ON, measure sensor supply voltage and ground reference at the connector; compare to spec.
Visual/wiggle test: Inspect connector/pins for corrosion and perform wiggle test while observing live steering angle data for intermittent faults.
Compare sensors: Monitor live steering angle, yaw rate, and wheel speeds while slowly turning steering wheel; look for inconsistencies (e.g., angle jumps, no change, or noise).
Check communications: Verify CAN bus messages for steering angle are present and check for communication-related codes (U-codes) in modules.
Sensor alignment: Ensure the steering wheel is centered and verify whether the vehicle requires a steering angle sensor relearn after battery disconnect, steering work, or sensor replacement.
Relearn/calibration: If wiring and power are good, perform the manufacturer’s steering angle sensor calibration/relearn procedure with a scan tool, then clear codes and test drive.
Component test/replace: If the sensor still reports implausible signals after calibration and wiring checks, replace the steering angle sensor and retest.
Module-level fault: If faults persist after sensor replacement and wiring verification, investigate the ABS/ESP control module and CAN bus for internal faults or intermittent communication failures.