C0577Brake Pressure Sensor D Circuit/Open
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Brake, ABS or stability warning lamp
- No valid value for sensor D on the scan tool
- Regenerative braking or brake assist limited
- Likely causes
- 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
- RareInternal open circuit in sensor D
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.