Symptoms of P0034 OBD II Trouble Code
- Irregular noises from the turbocharger wastegate and/or hoses
- Heavy black smoke from the exhaust
- Diminished engine performance
- Fouled spark plugs
- Higher engine and/or transmission temperatures
- Additional codes may also be stored, including other turbocharger boost related codes, engine misfire codes, or knock sensor codes
- Due to higher engine temperatures, cylinder detonation is also a definite possibility
Common Causes of P0034 OBD II Trouble Code
- Faulty boost pressure sensor
- Bad turbocharger bypass valve
- Disconnected, cracked, or collapsed vacuum lines (vacuum actuated bypass valve)
- A defective turbocharger bypass valve actuator
- Boost control sensor circuit wiring may be shorted, burnt, cut, or disconnected
- Loose, corroded, or disconnected electrical connectors in the boost sensor reference circuit
- Defective PCM or boost controller