Chassis, generic

C05C6 Brake Pressure Sensor F Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

The signal of pressure sensor F sits below its valid band. Ratiometric 5 V pressure sensors normally output roughly 0.5 to 4.5 V; Denso describes treating 0 to 0.3 V as a fault zone, and with a pull-down resistor at the input a broken supply or signal wire also drags the reading toward zero. Saab/GM sets its brake pressure circuit code when signal or 5 V reference has a ground short or an open lasting 0.1 s and then disables ABS and traction control. No manufacturer publishes C05C6 for sensor F, so the letter-to-sensor mapping is not public. Measure supply, ground and signal at the connector before replacing the sensor. C05C7 is the high side, C05C8 the open circuit, C05C9 the shared supply.

Likely causes

Signal wire shorted to ground
5 V reference interrupted or shorted to ground
Internal fault of pressure sensor F

Symptoms

  • ABS, ESC and traction control warning lamps on
  • Stability and traction control unavailable

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,200
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

brake pressure sensor fsensor wiring

Related codes

C05C7C05C8C05C9C059F

References: patents.google.com, saabwisonline.com, prod-edam.honeywell.com.