Chassis, generic

C0569 Brake Booster Solenoid Circuit Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

C0569 covers booster solenoid faults that are neither a clear open nor a clean short: the circuit reacts, but not as the module expects. Ford's hybrids (2015–2019) run three checks during operation, each over 80 ms: more than 2 V over the low-side driver while the high side is off, less than 160 mA in the test pulse with the high side on, or under 3.0 V supply with the high side on. Pump motor faults C052B–C052E block this test. A partly corroded connector or a coil with drifting resistance is the usual cause. GM used C0569 for something else entirely – a system configuration error in the transfer case module (PIP5089A) – so check the brand before diagnosing.

Likely causes

Corroded or loose terminals adding resistance in the solenoid circuit
Solenoid coil with out-of-range resistance
Degraded driver stage in the ABS module

Symptoms

  • Intermittent brake system warning
  • Brake assist occasionally unavailable
  • Code returns after clearing

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€40–900
Time0.5–3 h

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

Parts involved

brake booster solenoid

Related codes

C0566C0567C0568C052B

References: fordservicecontent.com, patents.google.com, static.nhtsa.gov.