OBD-II code · Powertrain (generic)
P004F Turbocharger/Supercharger Boost Control B Circuit Intermittent/Erratic
Same intermittent fault pattern as P004E on boost control B. Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
Is it safe to drive with P004F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyConnector loose or corroded
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
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
- Boost Control Solenoid B, Connector
Related codes
- P004ETurbocharger/Supercharger Boost Control A Circuit Intermittent/Erratic
- P004CTurbocharger/Supercharger Boost Control B Circuit Low
- P004DTurbocharger/Supercharger Boost Control B Circuit High
- P0050HO2S Heater Control Circuit (Bank 2 Sensor 1)
- P0051HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
- P0052HO2S Heater Control Circuit High (Bank 2 Sensor 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.