OBD-II code · Powertrain (generic)
P005F Turbocharger/Supercharger Boost Control B Supply Voltage Circuit High
Supply voltage feeding boost control actuator B is above the expected range. Likely charging system overvoltage or wiring shorted to a higher potential.
Is it safe to drive with P005F?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyAlternator regulator failed (overvoltage)
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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
- Parts involved
- Boost Actuator B Supply, Charging System
Related codes
- P006FTurbocharger/Supercharger Boost Control A Supply Voltage Circuit High
- P005CB Camshaft Profile Actuator A Control Performance/Stuck Off Bank 2
- P005DB Camshaft Profile Actuator A Control Stuck On Bank 2
- P005ETurbocharger/Supercharger Boost Control B Supply Voltage Circuit Low
- P0060HO2S Heater Resistance Bank 2 Sensor 2
- P0061HO2S Heater Resistance Bank 2 Sensor 3
- P0062HO2S Heater Control Circuit Bank 2 Sensor 3
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.