The P0039 code indicates a problem with the turbocharger bypass valve control circuit’s range/performance. This issue can manifest as loss of power during acceleration, rough idling, and reduced engine performance. Addressing this code involves inspecting and potentially replacing the turbocharger bypass valve control solenoid, along with checking related components like sensors and wiring.
P0039 quick overview
| Meaning | P0039 – Turbo Charger Bypass Valve Control Circuit Range Performance |
| Is it serious? | Yes, it affects the engine’s performance and can lead to further issues if not addressed. |
| Possible causes | – Faulty turbocharger bypass valve control solenoid – Damaged wiring or connectors – Leaks or obstructions in the intake system – Faulty turbocharger boost pressure sensor |
| How to diagnose? | Inspect the turbocharger bypass valve for proper operation and signs of wear. Test the turbocharger boost pressure sensor for accuracy. Check the intake system for leaks or obstructions. Examine the wiring harness and connectors for damage. |
P0039 Meaning
The P0039 code means there’s an issue with how the turbocharger’s bypass valve is controlled, affecting its performance range. This valve helps regulate the turbo’s boost pressure, and problems can cause power loss or erratic performance. Fixing it usually involves checking the valve, sensor readings, and the system for leaks, along with any wiring issues.
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How to fix P0039 – learn from mechanics
I looked into P0039 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Ford P0039
Vehicle information
Ford F-150 V6 EcoBoost 2019
Issue + repair history
- Owner reported loss of power during acceleration.
- Previous repairs: None mentioned.
- Current symptoms: Check engine light on, rough idling, reduced engine performance.
Other OBD2 Codes + Test Results
- P0039: Turbo Charger Bypass Valve Control Circuit Range Performance
- P0299: Turbocharger/Supercharger “A” Underboost Condition
- Live data: Turbocharger bypass valve position sensor reading out of range.
Mechanic suggestions
- Inspect the turbocharger bypass valve for proper operation and signs of wear.
- Test the turbocharger boost pressure sensor for accurate readings.
- Check for any leaks or obstructions in the intake system.
Final fix
Replaced faulty turbocharger bypass valve control solenoid and cleared error codes.
Case #2: Toyota P0039
Vehicle information
Toyota Tacoma V6 Turbo 2021
Issue + repair history
- Owner noticed reduced engine power and rough idling.
- Previous repairs: Replaced spark plugs and ignition coils.
- Current symptoms: Check engine light flashing, intermittent loss of power.
Other OBD2 Codes + Test Results
- P0039: Turbo Charger Bypass Valve Control Circuit Range Performance
- P0101: Mass or Volume Air Flow “A” Circuit Range/Performance Problem
- Live data: Mass airflow sensor readings below normal range.
Mechanic suggestions
- Inspect the turbocharger bypass valve and its control circuit for any faults.
- Check for any leaks in the intake system that could affect turbocharger performance.
- Test the mass airflow sensor for proper operation and cleanliness.
Final fix
Repaired damaged wiring harness leading to the turbocharger bypass valve control solenoid.
Case #3: Chevrolet P0039
Vehicle information
Chevrolet Silverado V8 Turbocharged 2022
Issue + repair history
- Vehicle exhibited hesitation during acceleration.
- Previous repairs: None mentioned.
- Current symptoms: Check engine light on, rough idling, reduced power output.
Other OBD2 Codes + Test Results
- P0039: Turbo Charger Bypass Valve Control Circuit Range Performance
- P0299: Turbocharger/Supercharger “A” Underboost Condition
- Live data: Turbocharger bypass valve position sensor reading erratic.
Mechanic suggestions
- Inspect the turbocharger bypass valve for proper operation and any obstructions.
- Check the turbocharger boost pressure sensor for accurate readings.
- Test the wiring harness and connections for any faults.
Final fix
Replaced faulty turbocharger bypass valve control solenoid and cleared error codes.
How to diagnose P0039
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Diagnostic Step | Explanation |
|---|---|
| Inspect bypass valve and circuit | Check the valve and its control circuit for faults. |
| Test boost pressure sensor | Ensure the sensor provides accurate readings. |
| Check intake system | Look for leaks or obstructions affecting performance. |
| Examine wiring and connectors | Identify and repair any damaged wiring or poor connections. |
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko