C100F

Code

LAND ROVER C — Chassis

Brake pedal position sensor - Power

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 17 EN: 25 RU: 14

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Page language: EN

Causes

Blown fuse or tripped relay for brake pedal sensor/ABS/BCM supply
Open or corroded connector at the brake pedal position sensor
Broken, chafed or shorted wiring between the fuse/relay and the sensor
Poor or missing ground for the sensor or control module
Failed brake pedal position sensor internal power circuitry
Faulty ABS/BCM/ECU power supply or internal fault

Symptoms

ABS, traction control or brake warning lamp illuminated
Cruise control may be disabled
Vehicle may not allow engine start or automatic transmission shift interlock (on some models)
Brake lights may operate erratically or not at all (if sensor integrates with brake light switch)
Possible warning message on dash and stored DTCs

What to check

Read DTCs and freeze frame with a capable scan tool; note any additional codes
Visually inspect fuse(s) and relay(s) related to the brake/ABS/BCM power circuits
Inspect the sensor connector at the brake pedal for corrosion, damage or moisture
Check battery voltage and vehicle charging system (low voltage can cause faults)
With key ON (engine off), check for correct supply voltage at the sensor power pin
Check continuity and resistance of the supply circuit back to the fuse and ground

Signal parameters

Sensor supply (battery/switchable power): nominally battery voltage ~11–15 V with key ON
Sensor reference/signal (where applicable): often a 0.5–4.5 V variable output or 0–5 V reference depending on design
Ground: low resistance to chassis ground (typically
No-load current draw: sensor should draw only a small amount of current; excessive current may indicate internal short

Diagnostic algorithm

Retrieve all stored codes and freeze frame data with a scan tool; record live data for the brake pedal sensor if available.
Visually inspect the pedal area, sensor mounting and wiring harness for damage, chafing, corrosion or water ingress.
Verify related fuses and relays (ABS, BCM, interior electronics). Replace any blown fuses and retest.
With the ignition ON (engine off), measure battery voltage at the sensor power pin. Compare to battery terminal voltage. If missing or low, trace supply back to the fuse and relay.
Check continuity between the sensor power pin and the appropriate fuse/relay output. Repair any open/shorted wiring.
Check sensor ground continuity to a known good chassis ground and to the module ground; repair poor grounds.
If supply and ground are good but the code persists, measure sensor signal while cycling the pedal to confirm proper operation. If signal is absent or erratic despite correct supply, suspect the sensor.
If wiring and sensor test OK, check the controlling module power/ground and inputs. Replace module only after wiring and sensor are verified good and with confirmation from manufacturer procedures.
After repairs, clear codes and perform a road/functional test while monitoring live data to ensure the DTC does not return.

Likely causes

Fuse or supply circuit fault (most common)
Damaged wiring harness or connector at the pedal assembly
Corroded connector pins or poor terminal contact
Failed brake pedal position sensor

Fault status

⚠️ Status

Brake pedal position sensor — power supply circuit fault detected. Check fuse/relay, wiring, connector and sensor power/ground before replacing components.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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C100F — Brake pedal position sensor - Power