P0034
Turbo/Super Charger Bypass Valve Control Circuit Low
Moderateturbo
Overview
The P0034 code indicates a turbo/super charger bypass valve control circuit low condition has been detected by the PCM. This code relates to the turbocharger/supercharger system that provides forced induction to increase engine power. Issues with the boost system can result in reduced power, poor fuel economy, and potential turbocharger damage if not addressed.
Symptoms
- Black or blue smoke from exhaust
- Poor acceleration
- Loss of boost pressure
- Oil leak near turbocharger
Common Causes
- Faulty wastegate control solenoid
- Worn or damaged turbocharger bearings
- Boost leak in intercooler piping
- Failed turbocharger boost pressure sensor
Diagnosis Steps
- 1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
- 2Inspect all boost hoses and intercooler piping for leaks or disconnections
- 3Test the boost pressure sensor with a multimeter or scan tool live data
- 4Check the wastegate and bypass valve for proper operation
- 5Inspect the turbocharger for shaft play, oil leaks, or damage
Estimated Repair Cost
$200 — $3,000
Cost varies by vehicle, location, and repair shop. Includes parts and labor.
Commonly Affected Vehicles
Volkswagen GTISubaru WRXMini Cooper SChevrolet Cruze Turbo
Related Codes
More Turbo Codes
P0033Turbo/Super Charger Bypass Valve Control Circuit
ModerateP0035Turbo/Super Charger Bypass Valve Control Circuit High
ModerateP0039Turbo/Super Charger Bypass Valve Control Circuit Range/Performance
ModerateP0045Turbo/Super Charger Boost Control Solenoid Circuit/Open
ModerateP0046Turbo/Super Charger Boost Control Solenoid Circuit Range/Performance
ModerateP0047Turbo/Super Charger Boost Control Solenoid Circuit Low
ModerateFrequently Asked Questions
Minor turbo codes like sensor issues may allow careful driving, but significant boost or oil-related turbo codes should be addressed immediately to prevent turbocharger failure, which is very expensive to repair.