P0035 indicates the powertrain control module has detected a higher-than-expected voltage on the electrical circuit that controls the turbocharger or supercharger bypass valve solenoid. This condition typically results from a short to voltage in the wiring or an internal electrical fault within the solenoid itself. The bypass valve manages boost pressure by rerouting air when the throttle closes or under specific operating conditions.
The solenoid coil can develop an internal short to power or fail electrically, causing the control circuit voltage to read higher than the PCM expects.
The control wire may have chafed, pinched, or melted against a battery voltage source, or shorted to an adjacent power feed within the harness.
Moisture, oxidation, or salt intrusion inside the solenoid connector can create a conductive path between the control pin and a power pin.
A compromised ground connection can alter circuit voltage characteristics and trigger a high-voltage fault under certain PCM monitoring strategies.
An internal driver fault within the PCM is a rare possibility and should only be considered after the solenoid and entire external circuit are proven fault-free.
It is not advisable. The vehicle may enter limp mode to protect the turbocharger, and continued operation can allow abnormal boost pressures that may damage engine components.
Usually not. This code refers to the bypass valve control circuit, not the turbocharger mechanical assembly. The turbo itself is often mechanically sound.
No. A failed PCM is an extremely unlikely cause of P0035. The fault is almost always the bypass valve solenoid or the wiring, and replacing the PCM without thorough circuit testing is generally incorrect.
No. P0035 is an electrical circuit code. A boost leak is a mechanical separation in the charge air piping, though both can produce similar performance symptoms.