C2306

Code

Generic C — Chassis

Steering Angle Sensor — Signal Fault

Brand: Generic

Type: C — Chassis

Views: UK: 10 EN: 9 RU: 7

AI status

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Page language: EN

Causes

Damaged or shorted wiring between SAS and control module (open, short to ground or battery, corroded conductors)
Poor or corroded connector terminals at the sensor or ECU
Failed steering angle sensor (internal electronics or potentiometer/encoder fault)
Faulty clockspring/spiral cable interrupting signal through the steering column
Loss of sensor reference power or ground (low battery, poor chassis ground)
CAN/communication bus faults or module software issues

Symptoms

ABS, ESC/traction control, or stability warning lamp illuminated
Loss or limited function of stability control, traction control, lane-keep or other steering-related aids
Steering angle readout (if displayed) incorrect or unavailable
Cruise control or adaptive cruise disabled
Possible diagnostic trouble codes related to wheel speed or yaw rate if sensor data disagree
Intermittent faults or codes that clear after restart (if wiring intermittent)

What to check

Read all related DTCs and freeze frame data with a capable scan tool; capture live SAS values while turning the wheel
Compare steering wheel angle reported by SAS to expected wheel position and to wheel speed sensors/yaw rate sensor
Visually inspect the sensor, connector, and wiring from the steering column to the ECU for damage, corrosion, chafing, or water ingress
Check battery voltage and main ground points; low supply or poor ground can corrupt sensor readings
Wiggle the harness and rotate the steering while watching live data to reproduce intermittent faults
Inspect/verify clockspring condition if the sensor signal passes through it

Signal parameters

Output type varies by vehicle: may be analog voltage (0.5–4.5 V with center ~2.5 V), PWM, or digital/CAN message
Typical update rate: tens to hundreds of Hz for real-time steering position data
Valid operating range: full left to full right; out-of-range or stuck-at values indicate fault
Expected behavior: smooth continuous change in angle value proportional to wheel rotation; no jumps, dropouts, or extreme noise
If CAN: message ID, length and bit mapping differ by manufacturer; check OEM data for exact parameters

Diagnostic algorithm

Retrieve codes and live data, note freeze-frame conditions. Clear codes and attempt to re-create fault while observing live SAS values.
Visually inspect connector, harness, and sensor for damage, corrosion, water, or loose pins. Repair any obvious physical damage.
Verify supply voltage and ground at the sensor connector with key on. For analog sensors expect stable reference and ground; record values.
Monitor SAS output while slowly turning the steering wheel; look for smooth continuous changes. Use oscilloscope for analog signal noise or dropouts.
Perform a wiggle test of the harness, connector, and clockspring while watching live data to find intermittent opens/shorts.
Compare SAS angle to wheel speed sensors and yaw/rate sensor: inconsistent readings suggest sensor or communication fault.
If wiring and power/ground check good, follow OEM procedure to perform SAS zero/learn calibration. Some faults clear only after relearn.
If fault persists after wiring and calibration verified, replace the steering angle sensor. Always recheck and perform calibration after replacement.
If replacement does not clear the code, inspect/replace clockspring or investigate ECU/CAN bus faults and seek manufacturer-specific diagnostics.

Likely causes

Wiring/connector fault between the sensor and the control module (most common)
Failed or intermittent steering angle sensor
Clockspring/column harness damage (common if steering wheel removal or airbag work was done)
Sensor not calibrated/zeroed after repairs or battery disconnect
Control module or CAN network fault (less common)

Fault status

⚠️ Status

Steering Angle Sensor — Signal Fault. The control module is receiving an invalid, missing, or out-of-range steering angle signal. May disable stability and traction systems until resolved.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5–3.0 hours