C1171

Code

Generic C — Chassis

Steering Angle Sensor — Implausible Signal

Brand: Generic

Type: C — Chassis

Views: UK: 4 EN: 7 RU: 4

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty steering angle sensor
Damaged or corroded wiring or connector
Defective or misaligned clock spring (spiral cable)
Poor or missing sensor calibration / initialization
Intermittent supply voltage or poor ground
CAN bus or control module communication error

Symptoms

ABS/ESC/Traction Control warning light(s) illuminated
Loss or reduction of stability control and related functions
Stored or recurring steering angle sensor DTCs
Inconsistent or sudden changes in steering angle readout on a scan tool
Automatic steering-related features (lane assist, adaptive cruise) disabled
Possible steering feel changes if mechanical damage present

What to check

Read and record all stored codes and freeze frame data; note if other related codes (yaw, wheel speed, CAN) are present
Check vehicle battery voltage (engine off and cranking) and charging system health
Visually inspect SAS connector, wiring, and clock spring for damage, corrosion, or looseness
Backprobe sensor connector with ignition on to verify reference voltage and ground
Use a scan tool to monitor live steering angle sensor data while slowly turning the steering wheel
Wiggle the steering column and wiring while observing live data for intermittent changes

Signal parameters

Sensor supply voltage: typically +5 V reference (verify with manufacturer spec)
Signal output: analog voltage (commonly 0–5 V) or digital CAN message encoding wheel/steering degrees
Expected steering angle range: often ±720° of steering wheel rotation or manufacturer specified range
Signal behavior: smooth, continuous change proportional to wheel turn; no abrupt jumps or dropouts
Update rate: steady CAN message/frame rate (e.g., multiple Hz); absence of messages indicates comm fault
Resistance/continuity: check wiring continuity to control module and for short to battery/ground

Diagnostic algorithm

Connect a professional scan tool, read and record all codes and freeze frame data. Note related codes (yaw rate, wheel speed, CAN).
Verify battery and charging system health. Low voltage can cause sensor/ECU errors—restore nominal voltage before further tests.
Perform visual inspection of steering column, clock spring, SAS connector and harness. Repair or secure any damaged wiring or connectors.
With ignition ON (engine off), backprobe the sensor connector: confirm reference voltage (typically 5 V), ground continuity, and measure signal voltage. Compare to expected behavior at straight-ahead position.
Monitor live steering angle data while slowly turning the wheel from lock to lock. The value should change smoothly and correlate with steering wheel movement. Look for dead zones, jumps, or dropouts.
Wiggle the wiring and rotate the steering column slowly to reproduce intermittent faults while observing live data. If movement causes code or data anomalies, repair harness/clock spring.
Check CAN bus and module communication. Use bus diagnostics to confirm SAS messages are present and not corrupted; inspect related module voltages/grounds.
If wiring and power are correct but signal is implausible, perform manufacturer-recommended SAS calibration/initialization (often required after sensor replacement or steering work).
If calibration fails or sensor data remains implausible after recalibration, replace the steering angle sensor. If replaced, perform mandatory calibration and road test.
After repairs and calibration, clear DTCs and perform a verification drive. Re-scan to confirm C1171 does not return and related systems operate normally.

Likely causes

Steering angle sensor internal failure (electronics out of spec)
Bent, chafed, or pinched wiring in the steering column harness
Loose, corroded, or pushed‑out connector pins at the SAS
Damaged clock spring causing intermittent signal or short
Battery voltage low or ignition supply fused/open to sensor
ECU receiving conflicting data from yaw rate or wheel speed sensors

Fault status

⚠️ Status

Steering Angle Sensor reporting implausible or inconsistent signal to ABS/ESC control module; stability/traction functions may be disabled until resolved.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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