Chassis, generic

C0573 Brake Pressure Sensor C Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

C0573 is reserved for an interrupted circuit of brake pressure sensor C – a broken signal, supply or ground wire, or a connector that has lost contact. No manufacturer documents it publicly; GM, which uses C0571 and C0572 for this sensor, books an open signal line under C0572. How an open shows up depends on the input circuit: with a pull-down resistor at the module, a lost supply or signal wire drops the reading to 0 V, while a lost ground can push it above 4.7 V, as a Denso patent on vehicle pressure sensors explains. Ratiometric transducers such as Honeywell's also drive power or ground loss to a defined rail. Sensor C usually sits in the brake module or hydraulic unit, and ABS, stability control or brake assist may be switched off.

Likely causes

Loose, corroded or pushed-back pin at the sensor or module connector
Broken signal, supply or ground wire in the harness
Internal open circuit in the pressure sensor

Symptoms

  • ABS, stability or brake warning lamp on
  • Pressure value missing or fixed at a rail on the scan tool
  • Fault may come and go when the connector is moved

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 csensor wiring

Related codes

C0571C0572C0574C0577C0540

References: patents.google.com, prod-edam.honeywell.com, techtips.ie, gsi.ext.gm.com.