Engine and gearbox (P)
P0035: Turbo Bypass Valve Circuit High
This code indicates that the turbocharger bypass valve control circuit is reporting a voltage that is too high. This could mean there is a short to power or an open circuit, which disables boost control.
Checked by a licensed car technician · last reviewed 30 September 2026
Symptoms
- Reduced engine power
- Turbocharger not functioning
- Engine warning light on
- Possible hissing noise from engine
Common causes
- Signal wire shorted to battery voltage
- Open circuit in wiring or solenoid
- Connector pins corroded
How to check it yourself
- Inspect wiring for damage or shorts
- Check connector pins for corrosion
- Test solenoid for continuity
- Measure voltage at the solenoid connector
Can I keep driving?
The car can be driven, but with reduced power and efficiency.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer