Learn more about the Audi P003900 code.
P003900 OBD-II Trouble Code
Understand what P003900 means for your Audi and book further diagnostics with our VAG specialists.
What is Code P003900?
When your Audi’s check engine light turns on and shows this code, it means the On-Board Diagnostic (OBD-II) system has detected an issue with Turbo/Super Charger Bypass Valve Control Circuit Range/Performance.
P003900
Turbo/Super Charger Bypass Valve Control Circuit Range/Performance.
P003900 – Technical Description
- Audi OBD-II Code: P003900
- Fault Type: Turbo/Super Charger Bypass Valve Control Circuit Range/Performance
How We Diagnose Audi Fault Code P003900
At VGS Performance, we use dealer-level Audi diagnostic tools to confirm the root cause before any repair work begins. Our diagnostic service includes:
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FAQs About Code P003900
What does P003900 mean on an Audi?
It indicates a fault with Turbo/Super Charger Bypass Valve Control Circuit Range/Performance.
What does an Audi OBD-II code mean?
Every code points to a specific fault detected by your Audi’s onboard computer. So codes such as P003900 helps our Swindon technicians locate issues faster and more accurately.
Can I clear OBD codes myself?
You can clear codes with a scanner, but if the issue hasn’t been properly fixed, the fault will return. It’s best to bring your Audi in so we can diagnose and resolve it correctly.
Audi Models Commonly Affected by Code P003900
The Audi P003900 fault code can appear across a range of models and engines within the Audi lineup. Because many vehicles share similar electronic and timing systems, this code isn’t limited to one particular model.
We’ve seen codes like P003900 appear on cars such as the Audi A3, A4, A5, Q5 and TT, as well as other petrol and diesel variants. In most cases, it’s the engine management system detecting a performance or communication issue that needs to be checked.
Whether you drive a compact Audi A3 or a larger Q-series SUV, our diagnostic equipment can read and interpret the fault accurately. Once identified, we’ll confirm the cause and advise on the best next step to keep your Audi running as it should.
Although the fault details vary, the core issue usually relates to Turbo/Super Charger Bypass Valve Control Circuit Range/Performance, which requires accurate testing and data analysis. We use dealer-level VAG diagnostic tools to monitor live data, verify system performance, and pinpoint the exact cause before carrying out any repairs.
Need Help with Code P003900?
If you’ve scanned your Audi and found P003900 If you’ve scanned your Audi and found P0010, our team can confirm the fault and carry out any repairs needed. We use official VAG equipment to ensure accuracy and reliability.
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