OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P0034?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- PossibleSolenoid internal short
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Turbocharger Bypass Valve, Wastegate Solenoid, Wiring Harness
Related codes
- P0031HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
- P0032HO2S Heater Control Circuit High (Bank 1 Sensor 1)
- P0033Turbocharger Bypass Valve Control Circuit
- P0035Turbocharger Bypass Valve Control Circuit High
- P0036HO2S Heater Control Circuit (Bank 1 Sensor 2)
- P0037HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.