C0571 code meaning
Brake Pressure Sensor C Circuit Low
Chassis system Generic code C05xx codes Check engine light
What C0571 means
Brake pressure sensor C is an additional hydraulic pressure sensor whose job depends on the brake system; each maker assigns the letter itself. GM uses C0571 in three variants. In the 2016–2019 hybrid brake control modules it is master cylinder pressure sensor 1, set when the signal line shows no voltage difference to ground for 0.1 s. In a 2019 EBCM with integrated booster it is the secondary circuit pressure sensor, set below 4.61 % of its supply within 100 ms. In the 2023 and 2025 tables a SENT master cylinder sensor pinned at its minimum of −1480 kPa for 0.96 s sets it. GM rates every variant Type A, MIL after one trip. ABS, stability control and regenerative blending are then restricted.
C0571 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0571
- Check engine light together with ABS or stability warning (GM)
- Regenerative braking or brake assist reduced, pedal feel changed
- Brake pressure reading on the scan tool stuck at its minimum
Common causes of C0571
- Most likelySensor signal line shorted to ground in the harness or connector
- PossibleSensor supply missing, so the output stays at its lowest value
- PossibleDefective pressure sensor, often integrated in the hydraulic or brake module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Brake pressure sensor cSensor wiringBrake control module
What each part of C0571 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 71 | The exact fault in that area. |
What to do next
- Note C0571 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 C0571
What does C0571 mean?
C0571 means "Brake Pressure Sensor C Circuit Low". Brake pressure sensor C is an additional hydraulic pressure sensor whose job depends on the brake system; each maker assigns the letter itself. It is a generic code, so it means the same on every make.
Is it safe to drive with C0571?
Drive gently and only to a workshop. With C0571 the car can go into limp mode (reduced power) to protect itself.
Will C0571 fail an emissions test?
C0571 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 C0571 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will C0571 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.