C2420

Code

Generic C — Chassis

Steering Angle Sensor Circuit Range/Performance

Brand: Generic

Type: C — Chassis

Views: UK: 15 EN: 31 RU: 11

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Faulty steering angle sensor (internal electronics or stepper/encoder failure)
Damaged or corroded wiring or connector (open, short to ground, short to Vref)
Poor ground or intermittent power/reference voltage
Sensor misalignment or lost zero-point calibration after repairs or battery disconnect
Faulty ABS/ESC control module interpreting the sensor data incorrectly
Mechanical steering damage or excessive play preventing correct sensor movement

Use a scan tool to read C2420 and any related codes; record freeze frame and live data
Visually inspect sensor and wiring at the steering column/clock spring for damage, corrosion, or disconnection
Check connector pins for corrosion, bent pins, or pushed-out terminals
Verify sensor reference voltage (usually 5 V), ground continuity, and signal output with DVOM or scope
Monitor steering angle live data while turning wheel center-to-lock to confirm correct response and range
Perform wiggle test on harness and connector while monitoring live data for intermittent changes

Typical wiring: 5 V reference, ground, signal (analog 0–5 V) or digital serial/CAN output; some sensors have dual redundant signal lines
At center position expected signal ~2.5 V for single-ended analog sensors (varies by design)
Angle output range often reported in degrees (e.g., ±720° or ±1080° depending on system) or as counts/units in scanner
Expected steady, linear change in voltage or count as wheel is turned; abrupt jumps or dropped-out values indicate fault
Reference voltage should be stable within ~4.8–5.2 V (manufacturer spec applies)

Read and record all stored codes and live data with a capable scan tool. Note freeze-frame conditions.
Clear codes and attempt to reproduce the fault while monitoring steering angle and related sensor data.
Visually inspect sensor, connector, and harness from the steering column to the ABS/ESC module; repair any obvious damage.
With key on (engine off) monitor the sensor reference voltage, ground continuity, and signal output at the sensor connector using a DMM. Compare to expected values.
Using an oscilloscope (preferred) or scan tool, observe signal while slowly turning steering wheel through full range to check for smooth, continuous output without dropouts or noise.
Perform wiggle tests on wiring and connectors while watching live data for intermittent faults.
If wiring, connector, power/ground are good but signal is out-of-range, perform sensor zero/teach or steering angle calibration per manufacturer procedure.
If calibration fails or signal remains out of range, replace the steering angle sensor and re-calibrate.
After repair or replacement, clear codes, perform the teach procedure, and road test to confirm fault does not return and ESC/ABS behave normally.
If problem persists after sensor replacement and calibration, investigate ABS/ESC module communication and processing (check for module faults or software updates).