What Does P0035 Mean?
The ECM has detected a high voltage condition in the turbocharger/supercharger bypass valve control circuit. The circuit voltage exceeds the expected threshold, indicating an open ground, short to battery voltage, or high-impedance solenoid. Boost pressure regulation is compromised, which may result in underboosting (no power) or potentially overboosting. The vehicle may enter limp mode to protect the engine.
Safety Warning
Drive with caution — the boost system cannot be properly controlled. If you feel surging or the engine goes into limp mode, drive directly to a repair facility. Uncontrolled boost can cause severe engine damage. Do not attempt sustained high-speed or high-load driving.
Common Causes
30%
Open ground circuit in the bypass valve solenoid wiring
30%
Bypass valve solenoid with open (burned-out) coil winding
20%
Control wire shorted to battery voltage in the harness
15%
Corroded or backed-out connector pins
5%
ECM driver circuit stuck open
Diagnostic Steps
1
Monitor boost pressure and bypass valve duty cycle PIDs. If the ECM is commanding the valve but boost pressure is unresponsive, the solenoid circuit is likely open.
2
Disconnect the bypass valve solenoid and measure coil resistance — expect 10–40 ohms. An infinite (OL) reading means the coil is burned out and the solenoid must be replaced.
3
Check the ECM ground control wire for continuity from the solenoid connector back to the ECM. Resistance should be under 1 ohm. An open ground will cause the circuit to float high.
4
Inspect for a short to B+ by measuring voltage on the control wire with the solenoid disconnected and key on. Battery voltage on the control wire indicates a harness short or ECM driver failure.
5
Examine the solenoid harness routing near the turbocharger for heat damage. Turbo-area wiring operates in extremely high temperatures and is prone to insulation failure.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The ECM has detected a high voltage condition in the turbocharger/supercharger bypass valve control circuit. The circuit voltage exceeds the expected threshold, indicating an open ground, short to battery voltage, or high-impedance solenoid. Boost pressure regulation is compromised, which may result...
The most common cause of P0035 (Turbo/Super Charger Bypass Valve Control Circuit High) is: Open ground circuit in the bypass valve solenoid wiring
Typical repair costs for P0035 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Drive with caution — the boost system cannot be properly controlled. If you feel surging or the engine goes into limp mode, drive directly to a repair facility. Uncontrolled boost can cause severe engine damage. Do not attempt sustained high-speed or high-load driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0035 to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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