Chassis, generic

C053F Brake Pressure Sensor A Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Brake pressure sensor A reports a voltage above the upper limit of its valid band. Since the sensor is fed with 5 V, a short of the signal line to the reference or to battery voltage, a broken ground wire or an internal fault can push the reading up; a Saab 9-5 brake unit draws the line at 4.75 V lasting 0.1 s. GM-built Saab 9-5 models from 2011 check both the 5-V reference and the signal wire of the pressure sensor, which sits in the brake modulator valve block, and then disable ABS, traction and stability control for the ignition cycle. The only public code mapping comes from Mitsubishi: C106C-17 equals C053F on the 2023 Outlander PHEV, with ASC lamp and MIL after two trips and a detection delay of a second at most. C053E is the opposite fault.

Likely causes

Signal wire shorted to the 5-V reference or battery voltage
Open or corroded sensor ground
Pressure sensor in the hydraulic unit defective

Symptoms

  • ABS and stability control warning lamps on
  • Traction control, stability control and hill-start assist unavailable
  • Check-engine lamp on some hybrids

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–1,500
Time0.3–3 h

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

Parts involved

brake pressure sensor asensor wiring

Related codes

C053DC053EC0540C0543

References: mitsubishitechinfo.com, mitsubishitechinfo.com, saabwisonline.com, saabwisonline.com.