Chassis, generic

C0577 Brake Pressure Sensor D Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Connector of sensor D unplugged, corroded or with a spread terminal
Wire broken near the sensor, e.g. at a flex point toward the rear axle
Internal open circuit in sensor D

Symptoms

  • Brake, ABS or stability warning lamp
  • No valid value for sensor D on the scan tool
  • Regenerative braking or brake assist limited

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€40–2,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

brake pressure sensor dsensor wiring

Related codes

C0575C0576C0578C0573C0544

References: prod-edam.honeywell.com, bosch-motorsport.com, patents.google.com, static.nhtsa.gov.