P0035: Turbo Charger Bypass Valve Control Circuit High

Definition

The OBD2 code P0035 indicates a malfunction in the turbocharger bypass valve control circuit, specifically that the circuit is reading a high voltage or signal, which may suggest a short circuit or a fault in the valve or its wiring

Common causes

Faulty turbocharger bypass valve
Damaged wiring or connectors in the control circuit
Short circuit in the control circuit
Open circuit in the control circuit
Faulty engine control module (ECM)
Poor ground connection
Corrosion or debris in the connector terminals

Common misdiagnoses

Faulty turbocharger
Vacuum leaks
Faulty boost pressure sensor
Wiring issues or shorts
Faulty engine control module (ECM)
Faulty bypass valve
Exhaust leaks
Incorrectly installed or damaged intake components

Troubleshooting steps

1. Check the Vehicle's Service Manual

Refer to the specific service manual for your vehicle to understand the wiring diagrams and specifications for the turbocharger bypass valve
2. Visual Inspection
3. Inspect the wiring and connectors associated with the turbocharger bypass valve for any signs of damage, corrosion, or loose connections
4. Look for any frayed wires or broken connectors that could cause a poor electrical connection
5. Check the Turbocharger Bypass Valve
6. Test the bypass valve itself to ensure it is functioning correctly. You can do this by applying power directly to the valve and observing if it opens and closes as expected
7. If the valve is stuck open or closed, it may need to be replaced
8. Test the Voltage Supply
9. Use a multimeter to check the voltage at the connector of the turbocharger bypass valve. Ensure that it is receiving the correct voltage as specified in the service manual
10. If the voltage is too high or too low, trace the wiring back to the power source and check for issues
11. Check the Ground Connection
12. Ensure that the ground connection for the turbocharger bypass valve is secure and free of corrosion. A poor ground can lead to high voltage readings
13. Inspect the Engine Control Module (ECM)
14. If all other components check out, the issue may lie with the ECM. Check for any software updates or known issues with the ECM related to the turbocharger bypass valve control
15. Scan for Additional Codes
16. Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide additional context for the issue
17. Clear the Code and Test Drive
18. After performing the necessary repairs or adjustments, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns
19. Consult a Professional
20. If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with turbocharger systems and OBD-II diagnostics. By following these steps, you should be able to identify and resolve the issue related to the P0035 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check the Vehicle's Service Manual

2. Visual Inspection

3. Inspect the wiring and connectors associated with the turbocharger bypass valve for any signs of damage, corrosion, or loose connections

4. Look for any frayed wires or broken connectors that could cause a poor electrical connection

5. Check the Turbocharger Bypass Valve

6. Test the bypass valve itself to ensure it is functioning correctly. You can do this by applying power directly to the valve and observing if it opens and closes as expected

7. If the valve is stuck open or closed, it may need to be replaced

8. Test the Voltage Supply

9. Use a multimeter to check the voltage at the connector of the turbocharger bypass valve. Ensure that it is receiving the correct voltage as specified in the service manual

10. If the voltage is too high or too low, trace the wiring back to the power source and check for issues

11. Check the Ground Connection

12. Ensure that the ground connection for the turbocharger bypass valve is secure and free of corrosion. A poor ground can lead to high voltage readings

13. Inspect the Engine Control Module (ECM)

14. If all other components check out, the issue may lie with the ECM. Check for any software updates or known issues with the ECM related to the turbocharger bypass valve control

15. Scan for Additional Codes

16. Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide additional context for the issue

17. Clear the Code and Test Drive

18. After performing the necessary repairs or adjustments, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

19. Consult a Professional

20. If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with turbocharger systems and OBD-II diagnostics. By following these steps, you should be able to identify and resolve the issue related to the P0035 code