Powertrain
generic / SAE
P0034
Turbocharger Bypass Valve Control Circuit Low
The bypass valve solenoid control circuit reports a voltage below threshold, indicating a short to ground or open driver. The ECU disables boost control until the fault clears.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number– / 34
Possible causes
- Signal wire shorted to ground high
- Solenoid internal short medium
- Connector pins corroded - high contact resistance low
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 100–500 €
- Estimated time: 0.5–3 h
- Component: turbocharger bypass valve
- Component: wastegate solenoid
- Component: wiring harness
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012