C1581

Code

Generic C — Chassis

Steering Angle Sensor Circuit Malfunction

Brand: Generic

Type: C — Chassis

Views: UK: 8 EN: 11 RU: 10

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Page language: EN

Causes

Damaged wiring harness to steering angle sensor (chafing, broken conductors)
Poor connector contact (corrosion, loose terminals) at sensor or ABS/ESC module
Failed steering angle sensor or internal encoder/potentiometer
Loss of reference voltage or ground to the sensor
CAN bus or LIN communication fault between sensor/module and ABS/ESC ECU
Intermittent mechanical damage in steering column affecting sensor

Symptoms

ABS, ESC or Traction Control warning lamp illuminated
Stability control disabled or behaves unpredictably during cornering
ABS intervention disabled or unavailable
Steering angle value absent, implausible, or stuck in live-data from scan tool
Possible fault codes stored in ABS/ESC and/or gateway modules

What to check

Read stored and pending DTCs from ABS/ESC and gateway modules; record freeze frame and live data
Check for other network codes (U-codes) that indicate CAN communication faults
Visually inspect steering column wiring harness and connectors for damage, corrosion, or pinbacking
Check battery voltage and engine ground for stability during testing
Using a scan tool, observe steering angle live data while slowly turning steering wheel — data should move smoothly and return to zero
Check reference voltage and ground at SAS connector with ignition ON (typical 5 V ref; refer to vehicle-specific spec)

Signal parameters

Typical reference voltage: ~5.0 V (check vehicle spec)
Signal output: analog or digital — common analog range ~0.5–4.5 V with ~2.5 V at center (straight ahead) or digital CAN message of steering angle in degrees
Sensor ground: near 0 V with low resistance to chassis ground
Live-data behavior: steering angle changes smoothly and proportionally with wheel input; no drop-outs or jumps
Resistance/continuity: verify per vehicle spec; many sensors have specified impedance between signal/ground/power pins

Diagnostic algorithm

Connect a capable scan tool; read and record ABS/ESC and network DTCs and freeze frame data. Note any related U-codes.
Verify battery voltage (12.6 V static, >11 V cranking). Low battery can corrupt communications.
With ignition ON (engine off), observe steering angle live data while gently turning the steering wheel both directions. Look for smooth correlated change and return-to-center value.
Inspect visually and wiggle test steering column harness and connector while watching live data — look for intermittent faults.
Backprobe SAS connector: check reference voltage (≈5 V), signal voltage (varies with wheel position), and ground integrity. Repair any missing reference or poor ground.
Perform continuity check from SAS connector pins to ABS/ESC module connector pins to confirm wiring integrity; check for short to battery or chassis ground.
If wiring and connectors OK but signal is implausible or absent, swap/replace steering angle sensor per vehicle procedures. Some sensors are integrated into clockspring — take care to follow airbag/steering lock safety steps.
After replacement or repair, clear DTCs, perform required steering angle sensor zero/calibration/relearn procedure with scan tool (many vehicles require a specific calibration routine) and road test to verify code does not return.
If fault persists and wiring and sensor check OK, investigate ABS/ESC control module input circuitry or CAN bus issues; consider module diagnostics, reflash or replacement as directed by manufacturer.
Safety note: when working on steering column, take precautions for airbag system (disconnect battery and follow wait-time and manufacturer procedures).