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Home / DTC / C05C6 — Brake Pressure Sensor F Circuit Low

C05C6 — Brake Pressure Sensor F Circuit Low

Detailed page for trouble code C05C6.

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C05C6

Generic C — Chassis

Brake Pressure Sensor F Circuit Low

Brand: Generic
Type: C — Chassis
Views: UK: 14 EN: 24 RU: 19
AI status
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Page language: EN

Causes

  • Short to ground on the sensor signal circuit
  • Open or high-resistance wiring/connector between sensor and control module
  • Failed brake pressure sensor (internal short or loss of output)
  • Loss of sensor reference supply (5V) or ground at the connector
  • Corroded or contaminated connector pins / water intrusion
  • Faulty ABS/ESP control module (rare)

Symptoms

  • ABS, ESP or Brake warning lamp illuminated
  • Stored DTC C05C6 (Brake Pressure Sensor F Circuit Low)
  • Possible reduced or altered ABS/traction control operation
  • Brake system warnings in dash or loss of some brake-assist features
  • Inconsistent brake feel or unexpected traction control intervention (depending on vehicle)

What to check

  • Read and record all stored codes and freeze frame data with a scan tool; check for related ABS/ESP codes
  • Visually inspect sensor F, connector, and wiring for damage, corrosion, water entry, chafing, or pin deformation
  • Backprobe sensor connector with ignition ON and engine OFF to check reference voltage and ground
  • Monitor live data/pressure signal with a scan tool while applying brake pressure or during a road/bench test
  • Perform wiggle test on wiring while observing live data for intermittent changes
  • Measure continuity and resistance between sensor connector and ABS module pins (check for short to ground)

Signal parameters

  • Typical reference supply: ~5.0 V (check vehicle spec)
  • Expected sensor output at zero/parking brake pressure: ~0.5–1.0 V (varies by model)
  • Expected sensor output at full pressure: ~4.0–4.5 V (varies by model)
  • Fault condition: signal voltage at or near 0 V (short to ground) or below manufacturer lower threshold

Diagnostic algorithm

  1. Use a scan tool to confirm C05C6 and any related codes; note live data and freeze frame. 2) Identify physical location of Brake Pressure Sensor F from service manual. 3) Perform a visual inspection of the sensor, connector, and wiring harness for damage, corrosion, water or pinch points. Repair obvious damage. 4) With ignition ON (engine OFF), backprobe the connector: verify 5V reference (or vehicle-specified sensor supply) and good chassis/ECU ground at the sensor connector. 5) Measure the sensor signal voltage with ignition ON while at rest; compare to expected zero-pressure value from vehicle spec. 6) Apply brake pressure (or have an assistant press pedal) while monitoring signal; if signal stays low, suspect sensor or wiring short to ground. 7) Check continuity between sensor signal pin and ABS/ECU pin; check for short to ground (low resistance) on the signal. 8) If wiring and supply/ground are good but signal is incorrect, replace Brake Pressure Sensor F. 9) After repair, clear codes and perform functional/road test; verify no recurrence and that ABS/ESP warnings are cleared. 10) If fault persists after sensor and wiring replacement, consider module/ECU diagnostic per manufacturer procedures.
  2. Safety note: support vehicle securely and follow manufacturer safety procedures when working on braking components.

Likely causes

  • Corroded/chafed connector at sensor F allowing intermittent short to ground
  • Damaged wiring harness where it contacts chassis or suspension components causing insulation wear
  • Failed brake pressure sensor element due to moisture or mechanical damage
  • Loose or corroded ground or 5V reference feed at the sensor connector

Fault status

⚠️ Status
Low-voltage condition detected on Brake Pressure Sensor F circuit — signal below expected range. ABS/ESP functions may be restricted; DTC C05C6 stored.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
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