C0569Brake Booster Solenoid Circuit Performance
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Intermittent brake system warning
- Brake assist occasionally unavailable
- Code returns after clearing
- Likely causes
- LikelyCorroded or loose terminals adding resistance in the solenoid circuit
- PossibleSolenoid coil with out-of-range resistance
- RareDegraded driver stage in the ABS module
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.