P005F
Turbocharger/Supercharger Boost Control B Supply Voltage Circuit High
Turbo / boost control
Generic OBD-II
High
What it means
P005F means the engine computer sees the supply (reference) voltage feeding the 'B' boost control circuit reading too high — usually a short to voltage or a wiring/connector fault. It's an electrical problem in the boost control system and typically limits power or triggers limp mode until the circuit is repaired.
High
Can I keep driving? Usually drivable, but boost may be limited or the car may enter reduced-power mode until the supply-voltage fault is fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power, especially above idle
- Low or erratic boost pressure
- Car may drop into limp mode
Common causes
Most likely first
- Short to voltage on the boost control supply/reference circuitLikely
- Damaged, loose, or corroded connector at the boost control componentCommon
- Chafed or pinched wiring in the supply-voltage circuitCommon
- Faulty boost control sensor or solenoid pulling the reference highLess often
- Failed engine control module (ECM) — rareLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check for related boost-control codes.
- Inspect the boost control connector and wiring for a short to voltage or damage.
- Back-probe the supply/reference voltage at the connector and compare to spec.
- Repair shorted or chafed wiring and clean corroded terminals.
- If the circuit tests good, consider the boost control component or ECM last. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P005F?+
Short trips are usually fine but power may be limited. Avoid hard driving or towing until the supply-voltage circuit is repaired.
Can I just clear P005F?+
No lasting benefit — this is an electrical supply fault, so it returns until the wiring, connector, or component is fixed.
Related codes
Often seen with P005F
Read & clear P005F yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX