Chassis, generic

C0543 Brake Pressure Sensor B Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Here the signal of brake pressure sensor B sits above the top of its permitted range, which points to a signal wire touching the 5-V reference or battery voltage, an open sensor ground, or a sensor that has failed high. Stellantis is the one maker naming the code publicly: bulletins covering the stop-start Cherokee of model year 2019 with the 3.2-litre V6 list Brake Pressure Sensor 2 Circuit High next to the matching low fault, logged in the engine control module and cleared up by new PCM software (18-023-19, 18-077-22). For the electrical threshold, a Saab 9-5 brake module flags readings above 4.75 V held for 0.1 s. Unlike C0541 this is a pure voltage fault; C0542 is the low counterpart and C0544 the open circuit.

Likely causes

Signal wire shorted to reference or battery voltage
Sensor ground open or high resistance
Engine control software fault (Jeep Cherokee 2019 bulletins)
Sensor failed with permanently high output

Symptoms

  • Check-engine lamp on
  • Stop-start or brake-related assistance not working

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 bsensor wiring

Related codes

C0541C0542C0544C053F

References: static.nhtsa.gov, static.nhtsa.gov, saabwisonline.com.