Turbo/Super Charger Bypass Valve Control Circuit Range/Performance (Bank 2)
The P0039 code means the vehicle's onboard diagnostic system has detected: Turbo/Super Charger Bypass Valve Control Circuit Range/Performance (Bank 2). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $250 - $700 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Inconsistent boost from Bank 2 turbo
- Reduced power under acceleration
- Possible surge or flutter from turbocharger
Probable Causes (Ranked by Likelihood)
- Sticking bypass valve on Bank 2 turbo Very High
- Vacuum leak at bypass valve actuator High
- Faulty bypass valve solenoid Moderate
- Wiring issue in bypass valve circuit Moderate
Frequently Asked Questions
What does P0039 mean?
P0039 indicates the Bank 2 turbo or supercharger bypass valve is not operating within its expected range, causing inconsistent boost control.
Why does my car have Bank 2?
Bank 2 refers to the side of the engine that does not contain cylinder 1. Vehicles with V-type or flat engines have two banks, and some have twin turbos with one per bank.
How much does it cost to fix P0039?
Repairs typically cost between $250 and $700, depending on whether the valve, solenoid, or wiring needs replacement.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Confirm P0039 with scan tool and review freeze frame data
-
Inspect Bank 2 turbo bypass valve for sticking or damage
-
Check vacuum lines to bypass valve actuator for leaks
-
Test bypass valve solenoid resistance and operation
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Commonly Affected Vehicles
- 2011-2018 BMW 335i
- 2010-2017 Audi S4 3.0T
- 2013-2020 Ford F-150 3.5L EcoBoost
- 2012-2019 Porsche 911 Turbo
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