C0577 code meaning
Brake Pressure Sensor D Circuit/Open
What C0577 means
C0577 stands for an open circuit of brake pressure sensor D. No manufacturer documents this code publicly. GM, which assigns sensor D to the left rear wheel pressure sensor in its hybrid brake modules, uses only C0575, C0576 and C0578 there; C0577 also appears in GM's code list for 2014 and older vehicles (PIP5094), where it belongs to GM's earlier numbering. An open wire is recognised because the reading moves into a band reserved for faults: if the module input has a pull-up resistor it goes high, with a pull-down it goes low, as Honeywell specifies for its ratiometric transducers. Brake-by-wire units monitor each extra pressure sensor separately; Bosch's EBS, for example, flags caliper and axle sensor faults one by one.
C0577 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0577
- Brake, ABS or stability warning lamp
- No valid value for sensor D on the scan tool
- Regenerative braking or brake assist limited
Common causes of C0577
- Most likelyConnector of sensor D unplugged, corroded or with a spread terminal
- PossibleWire broken near the sensor, e.g. at a flex point toward the rear axle
- Less likelyInternal open circuit in sensor D
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Brake pressure sensor dSensor wiring
What each part of C0577 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 77 | The exact fault in that area. |
What to do next
- Note C0577 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 C0577
What does C0577 mean?
C0577 means "Brake Pressure Sensor D Circuit/Open". C0577 stands for an open circuit of brake pressure sensor D. It is a generic code, so it means the same on every make.
Is it safe to drive with C0577?
Drive gently and only to a workshop. With C0577 the car can go into limp mode (reduced power) to protect itself.
Will C0577 fail an emissions test?
C0577 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 C0577 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will C0577 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.