P005E
Turbocharger/Supercharger Boost Control B Supply Voltage Circuit Low
Turbocharger / boost control
Generic OBD-II
High
What it means
P005E means the supply voltage feeding the "B" turbocharger/supercharger boost-control actuator is reading too low. Without proper voltage the actuator can't regulate boost as commanded, so the ECM usually limits boost or enters limp mode. The cause is almost always electrical — a short to ground, open feed, blown fuse, or bad connection — rather than the turbo itself.
High
Can I keep driving? Reduced — with low supply voltage the 'B' boost control can't operate normally, so the ECM often limits boost or enters limp mode; drivable but down on power.
Common symptoms
What you'll notice
- Check-engine light on
- Loss of power / limp mode
- Under-boost that doesn't match the pedal
- Hesitation on acceleration
Common causes
Most likely first
- Short to ground or open in the supply-voltage feed to the 'B' boost-control actuatorLikely
- Blown fuse or failed relay powering the boost-control circuitCommon
- Corroded, loose, or disconnected connector in the supply circuitCommon
- Chafed wiring pulling the supply voltage lowLess often
- Faulty boost-control actuator/solenoid loading the supplyLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data, then check the fuse and relay feeding the 'B' boost-control circuit.
- Inspect the supply wiring and connectors for shorts to ground, chafing, and corrosion.
- Measure the supply voltage at the actuator with the key on; a low reading confirms the feed fault.
- Repair the wiring, fuse, or connector; replace the actuator if it's dragging the supply down.
- Clear the code and confirm the boost control operates and voltage is normal.
FAQ
Quick answers
Is it safe to drive with P005E?+
Briefly and gently. The boost-control actuator isn't getting proper voltage, so the engine likely limits boost. Get the supply circuit checked before extended driving.
Can I just clear P005E?+
It returns immediately if the supply voltage is still low. The wiring, fuse, or connector fault must be repaired first.
Related codes
Often seen with P005E
Read & clear P005E 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