P0035 – Turbocharger/Supercharger Bypass Valve Control Circuit High
The P0035 diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected a high voltage or excessive current condition in the turbocharger/supercharger bypass valve control circuit. The bypass valve regulates turbo boost pressure by releasing excess compressed air when needed, helping protect the turbocharger and maintain efficient engine performance.
Symptoms of P0035
- Check Engine Light illuminated.
- Reduced engine performance.
- Loss of turbo boost or inconsistent boost pressure.
- Poor acceleration.
- Engine may enter limp mode.
- Whistling or unusual turbocharger noises.
- Increased fuel consumption.
Common Causes
- Short to voltage in the bypass valve control circuit.
- Faulty turbocharger bypass (diverter) valve.
- Damaged or shorted wiring harness.
- Corroded or loose electrical connectors.
- Faulty boost pressure control solenoid.
- ECM malfunction (rare).
How to Diagnose P0035
- Scan for additional diagnostic trouble codes.
- Inspect the bypass valve wiring and electrical connector.
- Check the control circuit for a short to battery voltage.
- Test the bypass valve and boost control solenoid.
- Inspect vacuum hoses if the system uses vacuum control.
- Monitor boost pressure with a scan tool during operation.
Possible Repairs
- Replace the faulty bypass valve.
- Repair shorted or damaged wiring.
- Replace damaged electrical connectors.
- Replace the boost pressure control solenoid.
- Repair vacuum leaks if present.
- Replace the ECM only after confirming all other components are functioning correctly.
Can You Drive With Code P0035?
The vehicle may still be drivable, but engine performance and turbocharger operation can be affected. Prompt repairs are recommended to prevent additional stress on the turbocharger and maintain proper boost control.
Estimated Repair Cost
- Bypass valve replacement: $100–$400
- Boost control solenoid replacement: $80–$300
- Wiring repair: $50–$200
- Vacuum hose replacement: $20–$100
- Turbocharger replacement (if required): $800–$3,000
Related Trouble Codes
- P0033 – Turbocharger/Supercharger Bypass Valve Control Circuit
- P0034 – Turbocharger/Supercharger Bypass Valve Control Circuit Low
- P0234 – Engine Overboost Condition
- P0299 – Turbocharger/Supercharger Underboost Condition
- P2261 – Turbocharger/Supercharger Bypass Valve Mechanical Performance