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Home / DTC / C1799 — Steering Column Position Sensor — Signal Implausible/Out of Range

C1799 — Steering Column Position Sensor — Signal Implausible/Out of Range

Detailed page for trouble code C1799.

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C1799

LAND ROVER C — Chassis

Steering Column Position Sensor — Signal Implausible/Out of Range

Brand: LAND ROVER
Type: C — Chassis
Views: UK: 12 EN: 28 RU: 16
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Page language: EN

Causes

  • Faulty steering column position/angle sensor (electrical or internal failure)
  • Damaged wiring, corroded connector pins or poor ground to the sensor
  • Intermittent or open/short circuit in sensor supply or signal circuits
  • Steering column mechanical wear, binding or incorrect sensor alignment
  • Loss of CAN/bus communication or ECU fault reporting incorrect interpretation
  • Battery/low supply voltage or transient electrical disturbance

Symptoms

  • Steering warning lamp or EPS/EPAS warning on instrument panel
  • Reduced or limited power steering assist (fail-safe mode)
  • ABS/ESP/stability warning lights may illuminate or systems disabled
  • Steering angle readout incorrect or drifting in scan tool live data
  • Intermittent faults that appear after turning the column or over bumps

What to check

  • Read and record all stored/active DTCs and freeze frame with a compatible OEM-level scan tool
  • Compare steering column position angle vs. wheel speed/wheel angle sensor values in live data
  • Inspect connector at the steering column sensor for corrosion, bent pins, water ingress or damage
  • Perform a wiggle test on wiring harness while monitoring live data to reproduce the fault
  • Check sensor supply voltage and ground with a DVOM (ignition ON) and for any intermittent dropouts
  • Inspect steering column mechanically for binding, worn splines, detached sensors or play

Signal parameters

  • Steering column sensor reports angle in degrees — expected range depends on vehicle (typical ±1080° or ±720° total rotation; vehicle-specific)
  • Potentiometer-type signals typically between ~0.5–4.5 V (vehicle-dependent); many modern sensors send digital/CAN values
  • Digital sensor resolution commonly 8–12 bit (e.g., 0–1023 counts) or higher; values should change smoothly with steering input
  • Signal should be consistent with wheel angle sensor and return to a centering value when wheels are straight
  • No rapid jumps, intermittent zeros or saturations to full-scale should be present during normal operation

Diagnostic algorithm

  1. Safety: Park on level surface, chock wheels, switch ignition OFF before physical inspections. Take usual precautions working on steering systems.
  2. Scan: Connect OEM-level diagnostic tool; read and document DTC(s), freeze frame and module/ECU data.
  3. Live data: Monitor steering column position, wheel angle sensors, yaw rate and related CAN messages while turning steering slowly. Note inconsistencies, jumps or out-of-range values.
  4. Reproduce: Perform a wiggle test of harness and connectors while watching live data to check for intermittent faults.
  5. Visual/measure: Inspect connector and wiring for damage. With ignition ON, measure sensor supply voltage and ground continuity; check signal waveform or voltage while rotating column.
  6. Compare sensors: Verify steering column sensor angle matches wheel-based steering angle sensor within manufacturer tolerance (use calibration reference if required).
  7. Calibration: If sensor and wiring pass tests but values are incorrect, perform steering angle sensor calibration/initialization using the factory scan tool and re-check.
  8. Repair or replace: If wiring or connector faults found, repair and retest. If sensor fails bench or in-vehicle tests, replace sensor with OEM part and program/calibrate per service procedure.
  9. Verify: Clear DTCs, perform road test and re-scan to confirm the fault does not return and that steering/ESP behavior is normal.
  10. If fault persists: Check related modules for CAN errors and inspect for software updates or ECU faults; escalate to module replacement/advanced diagnostics if required.

Likely causes

  • Wiring/connectors corroded, pin pushed out, or connector not fully mated
  • Sensor internal failure (common on high-mileage vehicles or after impact)
  • Sensor out of calibration (after steering repairs, wheel alignment or battery replacement)
  • Intermittent open/short in signal or ground circuit due to chafing/wear
  • CAN communication error or another module conflicting with steering data

Fault status

⚠️ Status
Steering Column Position Sensor — Signal Implausible/Out of Range
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C1798 C1797 C1234 C0035 C1323
320

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