B0168

Code

Generic B — Body

Steering Angle Sensor Circuit Fault

Brand: Generic

Type: B — Body

Views: UK: 6 EN: 13 RU: 7

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Damaged wiring harness (open, short to power/ground, or intermittent)
Corroded or loose connector at the steering angle sensor
Failed steering angle sensor (internal electronics or encoder)
Poor sensor power or ground (low voltage, high resistance)
Faulty body/ECU or ABS/ESC control module or internal module software error
Recent steering/column repair or sensor removal without performing zero-point calibration

ABS, ESC, or traction control warning lamp illuminated
Stability/traction control disabled or degraded function message
Steering angle value incorrect or not changing in scan tool/live data
Steering wheel not centered relative to direction indicator or stored angle
Unexpected braking/pulse of ABS/ESC or reduced drivability in cornering
Some vehicles may exhibit limited power or reduced engine output as a limp-home strategy

Read and record all stored DTCs and freeze-frame data with a scan tool
Check live steering angle sensor data while slowly turning steering wheel — verify value changes and returns to center
Inspect the sensor connector and wiring harness for damage, corrosion, or signs of rubbing at the column and bulkhead
Verify battery voltage at key-on and sensor supply pin (typically near 12 V or 5 V reference)
Check ground integrity for the sensor and control module
Wiggle test wiring and connectors while monitoring live data for intermittent faults

Power supply: typically 5 V reference (approx. 4.5–5.5 V) or vehicle battery (varies by design)
Ground: near 0 V with low resistance to chassis ground
Analog signal: 0–5 V range for some sensors; center (wheel straight) often ~2.5 V
Digital signal: some SAS use serial/PWM or CAN/LIN messages — expect regular angle updates (e.g., 5–100 Hz)
Resistance: internal encoder sensors may show stable, low-ohm DC resistance on certain pins (check OEM spec)
Fault symptoms in data: stuck voltage, noisy/oscillating signal, loss of messages, or invalid packet data/CRC errors

Connect a capable scan tool, read and record DTCs and freeze frame; note whether other modules report steering angle data.
Verify vehicle battery voltage is within spec; charge or maintain supply if low.
Visually inspect sensor and harness from column to module; repair obvious damage.
Backprobe sensor connector with key on and monitor power and ground pins for proper voltage and low-resistance ground.
Monitor the signal pin while slowly turning the steering wheel. Verify the signal changes smoothly and returns to center. Use an oscilloscope if available to check waveform quality.
Perform wiggle test on harness/connector while monitoring live data to reproduce intermittent faults.
If no power or ground, trace and repair wiring/connector faults. If signal absent or erratic while supply is correct, consider sensor replacement.
If sensor replaced or removed, perform steering angle zero-point calibration (follow OEM procedure) using scan tool.
Clear DTCs and perform road test to confirm repair and proper steering angle reporting during dynamic conditions.
If replacement sensor and calibration do not clear the issue, diagnose ABS/ECU communication wiring, module grounds, and consider module reprogramming or replacement per OEM guidance.

Intermittent open or short in sensor signal wire near steering column (common with steering-column movement)
Corrosion at connector causing intermittent contact
Faulty sensor output (stuck/erratic voltage or missing CAN/LIN messages)
Missing/incorrect steering angle zero-point calibration after battery disconnect or steering work
Poor battery voltage or weak ground affecting sensor supply