Failed turbocharger bypass valve solenoid or actuator; Open or damaged wiring in the bypass valve control circuit; Short to voltage on the control wire between the PCM and the valve; Corroded or loose electrical connector at the bypass valve; Faulty powertrain control module (PCM) driver for the bypass valve circuit; Internal mechanical failure of the bypass valve causing abnormal electrical feedback

DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P0035

P0035Turbo Charger Bypass Valve Control Circuit High

Q: What does code P0035 mean?

Turbo Charger Bypass Valve Control Circuit High. P0035 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the turbocharger bypass valve, which is also called a diverter valve or recirculation valve. The PCM commands the valve to open or close to manage boost pressure, and a high-voltage reading on the control wire typically means the circuit is open, shorted to power, or the valve's internal actuator has failed.

P0035 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the turbocharger bypass valve, which is also called a diverter valve or recirculation valve. The PCM commands the valve to open or close to manage boost pressure, and a high-voltage reading on the control wire typically means the circuit is open, shorted to power, or the valve's internal actuator has failed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Reduced engine performance or a sudden loss of boost pressure during acceleration
Turbocharger surge or compressor flutter noises when lifting off the throttle
Rough idle or stalling after deceleration due to improper bypass valve operation
Poor fuel economy or increased turbo lag as the PCM limits boost to protect the engine

Common causes, most likely first

Failed turbocharger bypass valve solenoid or actuator
Open or damaged wiring in the bypass valve control circuit
Short to voltage on the control wire between the PCM and the valve
Corroded or loose electrical connector at the bypass valve
Faulty powertrain control module (PCM) driver for the bypass valve circuit
Internal mechanical failure of the bypass valve causing abnormal electrical feedback

How to diagnose and fix it

Scan all modules and record freeze-frame data to confirm P0035 is the only related code
Visually inspect the bypass valve connector and wiring for corrosion, chafing, or loose pins
Measure resistance of the bypass valve solenoid and compare to manufacturer specifications
Check for battery voltage on the control circuit with the key on and the valve disconnected
Perform a wiggle test on the harness while monitoring the bypass valve control circuit with a multimeter
If the circuit and valve test good, substitute a known-good bypass valve and clear codes to verify the repair
Repair or replace the faulty wiring, connector, or bypass valve as indicated by the test results

Before you replace the bypass valve

A high-voltage code on a control circuit often points to an open circuit rather than a failed valve, so check the wiring and connector before condemning the valve itself.
Some turbocharged engines use a bypass valve that is vacuum-operated with an electrical position sensor; a faulty sensor can set P0035 even when the valve mechanically works.
The PCM may set P0035 as a result of a low-voltage condition elsewhere in the charging system, so verify battery and alternator health before deep circuit testing.
After replacing the bypass valve, some vehicles require a relearn or adaptation procedure for the PCM to recognize the new component and prevent a repeat code.
A stuck-open bypass valve can cause a rich condition and misfire codes that may distract from the root cause, so always address P0035 before chasing secondary codes.

Can I keep driving with P0035?

You can usually drive the vehicle with P0035, but avoid aggressive acceleration and heavy load because the PCM may limit boost to protect the turbocharger. Prolonged driving with a faulty bypass valve can lead to turbo damage or poor fuel economy, so schedule diagnosis soon.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.