C13A0

Code

Generic C — Chassis

Steering Angle Sensor Circuit Range/Performance

Brand: Generic

Type: C — Chassis

Views: UK: 17 EN: 20 RU: 17

AI status

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Page language: EN

Causes

Faulty steering angle sensor (SAS)
Damaged or corroded connector or wiring (open, short to ground/power, high resistance)
Loss of reference or ground at the sensor
Intermittent connection (movement-related faults)
Faulty ABS/ESC/steering control module or internal CAN bus communication error
Sensor not calibrated after replacement or after service

Symptoms

ABS, traction control or stability control warning lamps illuminated
Electric power steering assist reduced or disabled (on some vehicles)
Steering angle readout incorrect or shows erratic values on scan tool
Poor stability control intervention or unexpected braking/traction behavior
Intermittent or permanent fault lamp that may clear after ignition cycles

What to check

Check for other related codes (ABS, ESC, CAN communication) with a scan tool
Observe live steering angle sensor data at center wheel and while turning
Visually inspect sensor connector and wiring for damage, corrosion or pin push-out
Check vehicle battery voltage and main power/fuse for steering/ABS modules
Wiggle test wiring while monitoring live data to reproduce intermittent faults
Verify SAS calibration status and service history (was sensor recently replaced?)

Signal parameters

Typical reference supply: +5 V (some systems use 3.3 V) — verify with vehicle data
Typical signal types: single analog voltage (0.5–4.5 V) or dual Hall-effect (sine/cosine ~0–5 V)
Expected center (straight ahead) output: manufacturer-specified voltage or CAN angle ~0° (some units store offset)
Update rate: generally 10–100 Hz on CAN or PWM; missing updates indicate communication fault
Typical sensor resistance: varies by design; measure only if manufacturer spec available
CAN/BUS message ID and contents: steering angle, rate — verify with factory data or scan tool

Diagnostic algorithm

Safety: Park on level ground, wheels straight, key off. Disable airbag/steering work per service manual if needed.
Connect a capable scan tool. Read freeze frame and all stored/related codes (ABS, ESC, CAN, U-codes). Note live steering angle value at rest.
Visually inspect SAS connector and wiring from the sensor through the steering column. Look for chafing, breaks, pin corrosion, and secure fit.
With ignition ON (engine off), measure reference voltage and ground at the sensor connector (using service manual pinout). Confirm proper 5 V (or 3.3 V) and good ground.
Slowly turn steering from lock to lock while monitoring live steering angle output. Confirm signal moves smoothly and corresponds with wheel position. Note any dead zones or jumps.
Perform wiggle test on harness and connector while monitoring live data to find intermittent opens/shorts.
If the sensor uses analog outputs, probe signal with a multimeter or oscilloscope to verify expected waveform/voltage range and absence of noise.
If wiring and power/ground are good but readings are incorrect, check for module communication errors (CAN bus) and test related modules for faults or lost communication.
If sensor tests bad or inconsistent: replace the steering angle sensor. After replacement, perform steering angle sensor calibration/relearn per manufacturer procedure (required on most vehicles).
Clear codes and perform road test with scan tool to confirm proper operation and that C13A0 does not return.
If code returns after replacing sensor and calibrating, suspect control module fault or intermittent wiring inside column; escalate to detailed wiring harness diagnosis or module bench testing.

Likely causes

Corroded/bruised pin or connector at the SAS
Broken wire in the steering column harness (common at flex point)
Shorted signal to battery or ground from damaged harness
Failed Hall-effect or potentiometer element inside sensor
Module not receiving or rejecting SAS data due to prior voltage spike

Fault status

⚠️ Status

C13A0 — Steering Angle Sensor Circuit Range/Performance: sensor output out of expected range or implausible; check sensor, wiring, power/ground, and calibration.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3 hours

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