C0543 code meaning
Brake Pressure Sensor B Circuit High
Chassis system Generic code C05xx codes Check engine light
What C0543 means
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.
C0543 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0543
- Check-engine lamp on
- Stop-start or brake-related assistance not working
Common causes of C0543
- Most likelySignal wire shorted to reference or battery voltage
- PossibleSensor ground open or high resistance
- PossibleEngine control software fault (Jeep Cherokee 2019 bulletins)
- Less likelySensor failed with permanently high output
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Brake pressure sensor bSensor wiring
What each part of C0543 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 43 | The exact fault in that area. |
What to do next
- Note C0543 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C0543
What does C0543 mean?
C0543 means "Brake Pressure Sensor B Circuit High". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with C0543?
Drive gently and only to a workshop. With C0543 the car can go into limp mode (reduced power) to protect itself.
Will C0543 fail an emissions test?
C0543 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C0543 to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will C0543 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.