Chassis, generic

C0568 Brake Booster Solenoid Circuit High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

C0568 is the high-side counterpart of C0567: the solenoid circuit carries voltage when it should be dead. In Ford's 2015–2019 hybrid logic both drivers are commanded off and the solenoid supply line must stay near zero; more than 3.0 V for 80 ms points to a short to battery voltage or a driver that will not switch off, and the hybrid powertrain module reports C0568 (ABS code C0022). The risk is a solenoid energised without command, which would add boost the driver did not ask for, so the module blocks the function. An Aisin patent explains why that matters: energising the valve alone raises the booster output. Check for a short to a neighbouring powered wire before suspecting the module.

Likely causes

Solenoid wire chafed against a powered circuit
High-side driver in the ABS module not switching off
Contamination bridging pins in the solenoid connector

Symptoms

  • Brake system warning lamp
  • Brake assist switched off
  • Unusual pedal feel on hybrids

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€40–1,200
Time0.5–3 h

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

Parts involved

brake booster solenoid

Related codes

C0566C0567C0569C0022

References: fordservicecontent.com, patents.google.com.