C105C

Code

Generic C — Chassis

Steering Angle Sensor Circuit Malfunction

Brand: Generic

Type: C — Chassis

Views: UK: 6 EN: 4 RU: 7

AI status

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Page language: EN

Causes

Open, short or high-resistance in sensor wiring or connector
Loose, corroded or damaged connector pins
Failed or out-of-spec steering angle sensor
Damaged clock spring or wiring in the steering column
Loss of reference voltage or ground to the sensor
CAN bus or module communication fault

Symptoms

ABS, ESC or traction control warning light illuminated
Steering angle value incorrect or unavailable in scan tool live data
Vehicle stability/traction control interventions when not needed
Steering wheel appears off-center while vehicle drives straight
Inability to perform or complete SAS calibration
DTC stored and driveability may be unaffected until stability systems intervene

What to check

Read and record all related codes (ABS, ESC, airbag, body modules). Clear and retest to confirm persistence
Visual inspection of steering column, clock spring and sensor connector for corrosion, damage or loose pins
Check for recent steering/column repairs or airbag/clock spring replacement
Use a scan tool to view live steering angle sensor values while rotating the steering wheel
Inspect CAN-bus wiring and module power/grounds if sensor communicates over CAN

Signal parameters

Typical sensor supply: 5 V reference (verify approx. 4.5–5.5 V with ignition ON)
Signal output (analogue type): approx. 2.5 V at center; varies smoothly as wheel turns (typical ±1–2 V swing)
Digital/CAN sensors: steering angle message present on CAN bus; angle range commonly reported in degrees (e.g., -720° to +720°) or as counts
Resistance checks: internal sensor coil or potentiometer values vary by design — expect stable, consistent resistance without open/short
Signal behavior: smooth, continuous change with wheel rotation; abrupt jumps, dropouts or frozen value indicate fault

Diagnostic algorithm

Connect a professional scan tool. Record C105C and any related codes (ABS, ESC, U-codes). Note freeze-frame and live data. Clear codes and see if C105C returns.
Visually inspect sensor connector, wiring harness along steering column and under dash for chafing, corrosion, pin damage or water entry. Repair any visible damage.
With ignition ON (engine off), backprobe connector: verify 5V reference present and good ground. Measure sensor signal at center of wheel — expected ~2.5 V (manufacturer-specific).
Slowly rotate steering wheel left and right while watching live signal: signal should change smoothly. Look for dropouts, sudden jumps, or incorrect center value.
If signal missing or out of spec, check continuity between sensor connector and the control module for power, ground and signal. Repair open/shorts as needed.
Inspect and test the clock spring: check continuity of relevant circuits through full wheel rotation. Replace clock spring if wires are broken or intermittent.
If sensor is CAN-based and messages are missing/invalid, verify CAN bus voltage levels, termination and check for other modules throwing U-codes. Repair CAN faults before replacing sensor.
If wiring, power and clock spring are good but sensor output is out-of-spec or intermittent, replace the steering angle sensor per manufacturer procedure.
After repair or replacement, perform steering angle sensor calibration/initialization with a scan tool as required by manufacturer. Clear codes and road test to confirm fault does not return.
If fault persists after sensor replacement and calibration, consider control module fault and follow module-level diagnostics (consult manufacturer documentation).

Likely causes

Corroded/loose connector or damaged wiring at the steering angle sensor
Faulty clock spring causing intermittent or open circuit to sensor
Failed steering angle sensor (internal electronics)
Loss of sensor 5V reference or ground from control module
CAN communication fault between sensor/module and ECU

Fault status

⚠️ Status

Stored when the control module detects invalid, implausible, missing or out-of-range steering angle sensor signal or communication. May indicate open/shorted circuit, loss of reference/ground, clock spring or sensor failure, or CAN communication error. Requires inspection and verification of wiring, connectors, sensor and calibration.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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