C0609Park Brake Switch Circuit
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- The park brake switch is the driver's apply and release button for an electric parking brake; on some cars it also reports lever or button state to other modules. C0609 covers an electrical fault in its circuit, such as an open contact, a short to ground or supply, or an unplugged connector. Continental's patent for a redundant EPB button gives each switch level its own supply and ground and measures resistor potentials to find these faults, then still reads the driver's request from the intact channel. Audi logs C060900, under the same switch title, in J623, the engine control unit of 2022–2024 Q4 e-tron models, with a drive system warning and sometimes no gear engagement; TSB 2074088 calls for a 15-minute terminal 30 reset and earth strap work.
- What you may notice
- Park brake or drive system warning in the cluster
- Parking brake does not respond to the button
- Gear selection refused in some electric models
- Likely causes
- LikelyConnector at the switch or in the dash not fully engaged
- PossiblePoor ground or control unit software (Audi Q4 e-tron case)
- PossibleWorn, contaminated or corroded switch contacts, e.g. after spilled drinks
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.