AutoCodes – Buick – P0034 Buick

P0034 Buick Code - Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage

Quick Answer

The dual scroll turbocharger incorporates a wastegate that is controlled by a pressure differential, which is determined by the Engine Control Module (ECM) using a PWM solenoid, to regulate the pressure ratio of the compressor. Common causes include Faulty Turbocharger Bypass Solenoid Valve, Turbocharger Bypass Solenoid Valve harness is open or shorted, Turbocharger Bypass Solenoid Valve circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0034 Buick indicates Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage.
Common causes: Common causes include Faulty Turbocharger Bypass Solenoid Valve, Turbocharger Bypass Solenoid Valve harness is open or shorted, Turbocharger Bypass Solenoid Valve circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 245

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on May 08, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code P0034 Buick Description

The dual scroll turbocharger incorporates a wastegate that is controlled by a pressure differential, which is determined by the Engine Control Module (ECM) using a PWM solenoid, to regulate the pressure ratio of the compressor. A compressor bypass valve also controlled by the ECM by utilizing a remotely mounted solenoid is integrated into the bypass valve to prevent compressor surging and damage from vibrations by opening during abrupt closed throttle conditions. When the valve is open during closed throttle deceleration conditions, the bypass valve allows the air to recirculate in the turbocharger and maintain compressor speed. Within a calibrated range during the closed throttle event, or upon a wide-open throttle command the valve will then close to optimize turbo response. The bypass valve solenoid has the following circuits: Ignition voltage and Turbocharger bypass valve solenoid control.
As engine load and RPM increase the turbocharger bypass solenoid parameter should remain commanded ON by the ECM. As soon as the throttle closes the turbocharger bypass solenoid parameter should be commanded OFF by the ECM, to allow the turbocharger bypass valve to open and allow the turbocharger air to recirculate, thereby preventing compressor surging.

OBDII Code P0034 Buick - Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage - AutoCodes.com — P0034 Buick Code - Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0034 Buick?

Faulty Turbocharger Bypass Solenoid Valve
Turbocharger Bypass Solenoid Valve harness is open or shorted
Turbocharger Bypass Solenoid Valve circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0034 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0034 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.