P0035 Turbocharger/Supercharger Bypass Valve Control Circuit High

P0035 points to a high turbocharger or supercharger bypass valve control circuit. The control path is open or shorted to voltage.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the boost actuator before isolating whether the high circuit is wiring, connector, or driver related.

Symptoms of P0035

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0035

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Check bypass valve signal voltage, ground path, open circuits, short-to-voltage faults, connector fit, and actuator resistance.
Inspect wiring near the turbocharger, supercharger, intercooler plumbing, and heat shields for melted insulation or loose terminals.
Compare commanded bypass operation with boost pressure response, drivability symptoms, and related boost-control codes.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.