C1A4F

Code

Generic C — Chassis

Steering Angle Sensor: Intermittent Signal

Brand: Generic

Type: C — Chassis

Views: UK: 15 EN: 19 RU: 17

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ABS/ESC traction control or EPS warning lamp illuminated intermittently
Intermittent loss of stability control functions
Steering angle value missing, jumping or showing incorrect values in scan tool live data
Possible sudden changes in steering assist behavior or steering torque feel
DTC present sometimes and may clear after ignition cycle or reconnecting battery

Read freeze frame and event count; note when fault sets and clears
Scan live data: steering wheel angle, sensor messages, reference voltage and grounds, and compare to wheel position
Check for other related codes (ABS, ESC, BCM, CAN bus) that could indicate communication issues
Visual inspection of SAS connector, wiring harness, clock spring/spiral cable for damage or corrosion
Wiggle test wiring and connectors while monitoring live data for intermittent changes
Measure reference voltage (typically 5V), ground continuity, and sensor signal with DVOM and oscilloscope if available

Reference voltage: typically ~5 V (check vehicle spec); should be stable with ignition ON
Ground: solid continuity between sensor ground pin and chassis ground, low resistance
Signal type: may be analog 0.5–4.5 V, dual Hall outputs, PWM, or digital CAN/LIN message depending on vehicle
Update rate: sensor/ECU message typically updates 10–100 Hz (vehicle-specific)
Oscilloscope pattern: steady, repeatable waveform corresponding to wheel rotation; intermittent dropouts or noise indicate faults
Allowed deviation: sensor angle should track steering wheel rotation smoothly without sudden jumps or dropouts

Connect a scan tool, record freeze frame data and live steering angle values while turning the wheel slowly through full range.
Clear the code and replicate driving/turning conditions to see if code returns and under what circumstances.
Visually inspect the steering column area, clock spring, and connector for bent pins, corrosion, water, or damage.
Perform wiggle test: with ignition ON and live data displayed, gently move wiring and connectors to observe intermittent changes; if present, repair wiring/connector.
Measure reference voltage and ground at the sensor connector; verify stable 5V (or vehicle-specified) and good ground. Repair poor supply or ground as needed.
Use an oscilloscope to monitor the sensor signal while rotating the wheel; look for missing pulses, noise, or voltage dropouts that indicate intermittent sensor or wiring faults.
If communication-type sensor (CAN/LIN), check bus integrity and related module communications; inspect for high CAN bus error counters and repair bus issues.
If wiring and bus are good but the signal is intermittent or out of spec, replace the steering angle sensor or clock spring assembly as applicable.
After repair or replacement, perform steering angle sensor calibration/zeroing per manufacturer procedure and verify operation with road test.
If code persists after sensor replacement and calibration, inspect/replace related control module or investigate intermittent module software issues and consider reflash/update.

Wiring/connector corrosion or loose terminal at the sensor
Faulty clock spring causing intermittent contact
Intermittent internal sensor electronics failure
Weak or intermittent reference voltage/ground from vehicle wiring or BCM
Intermittent bus communication error (CAN/LIN) between sensor and ABS/ESC module