Code
C2349
Generic
C — Chassis
Steering Angle Sensor Circuit Intermittent
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UK: 1
EN: 2
RU: 1
AI status
Completed
Completed
100%
Causes
- Wiring damage, chafing or broken conductor in steering column harness
- Poor connector contact or corrosion at sensor, clockspring, or control module
- Intermittent power or ground to the sensor (loose terminal, degraded ground)
- Faulty steering angle sensor (internal intermittent)
- Damaged or worn clockspring/spiral cable assembly
- Intermittent CAN bus or module communication error
Symptoms
- Intermittent ABS, ESC, traction control or EPS warning lights illuminated
- Loss or intermittent loss of stability control and traction control functionality
- Faults only occur when steering wheel is turned or after movement (intermittent)
- Failed or incomplete SAS calibration / warning to recalibrate
- Possible steering assist changes or temporary steering feel variations
- Stored intermittent DTCs and freeze frame data showing variable readings
What to check
- Connect a capable scan tool: read all related DTCs and freeze frame, view live SAS data and redundancy channels
- Visually inspect steering column harness, connectors, and clockspring for damage, corrosion, or water
- Wiggle test harness and connector while watching live data or DTCs to reproduce the intermittent fault
- Verify reference voltage (typically 5 V) and good ground at the sensor connector with ignition ON
- Probe sensor signal lines while rotating the steering wheel to confirm smooth, continuous output and matching redundant channel behavior
- Check CAN bus voltage and continuity to related modules if SAS communicates over CAN
Signal parameters
- Reference voltage: typically 5 V (manufacturer dependent) present at sensor Vref pin with ignition ON
- Ground: solid low-resistance chassis/ECU ground (near 0 ohms expected to chassis)
- Signal outputs: redundant Hall/angle outputs typically vary within ~0.2–4.8 V across full wheel sweep; both channels should track each other
- Output update rate: tens of Hz (sensor updates 10–100 Hz depending on system)
- CAN/serial: some vehicles transmit steering angle as a CAN message — expected periodic message rate often 10–100 Hz and valid angle values in degrees (0 ± range); loss or intermittent messages indicates comms issue
- Resistance/continuity: wiring harness continuity should be full and free of intermittent opens when steering wheel is turned
Diagnostic algorithm
- Safety first: follow manufacturer procedure for disabling SRS/airbag system (disconnect battery and wait the specified time) before working near clockspring or airbag components.
- Scan and record all active/pending/ historic codes from all modules (ABS, ESC, BCM, EPS). Note freeze frame and live SAS values.
- Clear codes, then attempt to reproduce the fault by driving or moving the steering while monitoring live SAS data and DTCs.
- Perform visual inspection of the steering column harness, sensor connector, and clockspring for damage, corrosion, or water entry.
- With ignition ON (and appropriate safety for airbag circuits), measure reference voltage and ground at the SAS connector. Confirm steady reference and good ground.
- Backprobe signal wires and observe sensor outputs while slowly turning the steering wheel through full range. Look for dropouts, voltage spikes, channel disagreement, or intermittent behavior.
- Wiggle test wiring and connector while monitoring live data to locate intermittent open/short caused by movement. Inspect for broken strands inside insulation.
- If the vehicle uses CAN messages for angle, monitor CAN traffic for lost or intermittent messages and check module power/grounds and bus termination.
- If wiring and connectors check good but signals are intermittent or out of spec, remove/inspect the clockspring and SAS mounting. Replace clockspring if internal damage or intermittent contact is found.
- Replace the steering angle sensor only after verifying wiring and connectors are sound. After replacement or repairs, perform required SAS calibration/adaptation using a scan tool.
- Clear codes and test-drive to confirm no recurrence. If fault persists, escalate to module-level diagnostics (ABS/ESC module or BCM) and check for intermittent module faults or update software if applicable.
Likely causes
- Corroded connector at SAS or clockspring causing intermittent contact
- Frayed wiring inside the steering column rubbing and breaking intermittently when wheel is turned
- Failing clockspring that intermittently opens circuit or shorts signals
- Loose sensor mounting causing intermittent signal changes
- Intermittent ground or 5 V reference feed from ABS/ESC module
Fault status
Status
Intermittent Steering Angle Sensor circuit fault — signal lost or out of expected range intermittently, affecting stability/traction/EPS systems.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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