C1D13

Code

Generic C — Chassis

Steering Wheel Torque Sensor Circuit — Range/Performance

Brand: Generic

Type: C — Chassis

Views: UK: 11 EN: 16 RU: 11

AI status

Completed

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Page language: EN

Causes

Open, short or high-resistance wiring or connector to the torque sensor
Damaged or failed steering wheel torque sensor (internal fault)
Faulty clock spring / slip ring assembly or poor steering column connector
Poor power or ground to the sensor (low battery voltage, corrosion)
Intermittent CAN/communications errors between sensor and control module
Mechanical binding in the steering column or abnormal steering column loads

Symptoms

ESC/Traction control or EPS warning lights illuminated
Reduced or unpredictable power steering assist or sudden changes in steering feel
Steering assist disabled (limp mode) or degraded steering performance
Temporary loss of stability control functions
Stored/active torque sensor fault codes and fault lamp on instrument cluster
Inconsistent or zero torque reading in live-data while turning steering wheel

What to check

Read and record all related DTCs and freeze frame data from ABS/ESC and EPS modules
Inspect wiring and connectors at the steering wheel, clock spring, and steering column for damage, corrosion or loose pins
Check battery voltage and charging system; low system voltage can affect sensor outputs
Use scan tool to view live torque sensor output, steering angle, and compare signals while turning the wheel
Perform wiggle tests on wiring and connectors while observing live data for intermittent changes
Check for communication errors on CAN bus and module-to-module messages

Signal parameters

Typical sensor type: strain gauge/torque sensor producing an analog differential or single-ended voltage with mid-scale bias
Idle/bias voltage commonly near mid-supply (~2.5 V) with clockwise/counterclockwise torque causing ± voltage deviation
Expected dynamic change: smooth proportional change in voltage as steering torque is applied; no sudden jumps, dropouts or saturation
Common frequency / sample behavior: low-frequency analog signal updated many times per second (monitorable as live numeric torque value on scan tool or CAN message)
If available, compare torque sensor value to steering angle and vehicle speed; values should correlate (non-zero torque when turning)

Diagnostic algorithm

Verify battery voltage is within specification and record any other stored codes in EPS/ESC modules.
With scan tool, view live torque sensor output (raw voltage or torque value) and steering angle while an assistant slowly turns the steering wheel left and right.
Confirm the sensor shows a stable mid-scale bias and smooth change with torque. Note any dropouts, spikes, or values out of expected range.
Visually inspect connectors, harness and clock spring for damage. With ignition off and following airbag safety procedures, disconnect and reconnect connectors to check for corrosion or loose terminals.
Perform continuity/resistance checks on signal, power and ground circuits from the sensor connector back to the control module (apply back-probing only if trained and safe).
Wiggle the wiring and clock spring while monitoring live data for intermittent faults. Repair any damaged wiring or corroded terminals.
Check power/ground at the sensor connector with meter: verify sensor supply voltage and ground quality are within spec.
If wiring and supply are good but signal is implausible, consider replacing the clock spring or torque sensor assembly as per vehicle service procedures.
After repair or replacement, clear codes and perform required calibrations (steering angle sensor/torque sensor/ESP as specified by manufacturer).
Road test to confirm normal sensor behavior and that no related DTCs return.

Likely causes

Broken or corroded connector at the clock spring
Clock spring worn/shorted causing intermittent signal
Sensor bias voltage missing or out of range (power/ground fault)
Short to voltage/ground in sensor signal circuit
Sensor internal failure (drift or stuck output)

Fault status

⚠️ Status

Stored when the steering wheel torque sensor output is outside expected range or shows implausible/performance faults, which can cause EPS/ESC warnings and possible loss of steering-assist or stability control functionality.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours