C1109

Code

LAND ROVER C — Chassis

pedal sensors Vehicle dynamics control switch

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 14 EN: 28 RU: 27

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Page language: EN

Causes

Damaged or corroded connector at the pedal sensor or VDC switch
Broken, shorted or open wiring harness between pedal switch/sensor and ABS/VDC module
Faulty pedal position sensor (accelerator or brake pedal sensor) or Vehicle Dynamics Control switch
Intermittent contact or mechanical failure inside the switch/sensor
Faulty ABS/VDC control module or poor ground at the module
Software/firmware issue or missed calibration after replacement

Symptoms

VDC/traction control warning lamp illuminated
ABS/VDC functions limited or disabled; loss of traction/stability assist
Cruise control disabled or inoperative
Engine may enter reduced-power mode on some models
Intermittent or persistent DTC C1109 recorded in fault memory

What to check

Read and record all current and historic codes with a capable diagnostic tool (include ABS/VDC module).
Check for related codes (ABS, ECM, other C1xxx codes) that may indicate shared circuits.
Visually inspect pedal area, sensor and VDC switch for damage, loose fasteners or contamination.
Inspect wiring harness and connectors between pedal assembly/switch and ABS/VDC module for corrosion, loose pins, breaks or chafing.
Check fuse(s) and power/ground supply to the VDC switch and ABS/VDC module.

Signal parameters

VDC switch: typically reported as a discrete contact state (ON/OFF) in the scan tool; should change state when switch is operated.
Pedal position sensor: analogue voltage or CAN message. Typical sensor voltages fall within a 0.5–4.5 V range across pedal travel for potentiometer-type sensors (model dependent).
Connector pin voltages: key-on power supply to switch/sensor ≈ battery voltage (12 V nominal); good ground near 0 V. Confirm with OEM wiring diagram.

Diagnostic algorithm

Retrieve freeze-frame and live data for pedal sensor(s) and VDC switch using a vehicle-specific scan tool. Note any intermittent behavior.
Attempt to reproduce the fault while monitoring live signals: operate pedal(s) and toggle VDC switch while watching the data stream for expected changes.
Perform visual inspection of connectors and wiring; repair any obvious damage. Secure connectors and clean corrosion if present.
With ignition on (engine off), backprobe the sensor and switch connectors: verify supply voltage, ground, and signal output while operating the pedal or switch. Compare to expected ranges from manufacturer literature.
Check continuity between the pedal/switch connector and the ABS/VDC module connector to rule out open or short circuits. Wiggle test to detect intermittent faults.
If wiring and connectors are good, swap or bench-test the pedal sensor or VDC switch (if a serviceable replacement is available) and re-scan for codes.
If new parts are fitted, perform any required calibrations or module updates per service procedures. Clear codes and road test to confirm repair.
If fault persists after sensor/switch replacement and wiring verification, consider ABS/VDC module fault diagnosis or software/ECU investigation; consult technical service bulletins.

Likely causes

Corroded/poor connector at pedal sensor or VDC switch
Wiring damage (pinched, chafed or shorted) between sensor/switch and control module
Failed pedal position sensor or VDC switch

Fault status

⚠️ Status

Pedal sensor / Vehicle Dynamics Control (VDC) switch circuit fault detected. Check pedal sensor, VDC switch, wiring and control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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C1109 — pedal sensors Vehicle dynamics control switch