P004E
Turbocharger/Supercharger Boost Control A Circuit Intermittent/Erratic
Turbo / boost control
Generic OBD-II
High
What it means
P004E means the ECM sees an intermittent or erratic signal in the electrical control circuit for the turbocharger's boost-control actuator. Because the fault comes and goes, it usually traces to a loose connector, chafed wiring, or a marginal solenoid rather than a hard short. Boost can drop in and out, and the engine may briefly enter reduced-power mode until the connection is repaired.
High
Can I keep driving? Drivable but degraded — boost can drop in and out and the engine may enter reduced-power mode. Fix it soon; intermittent faults tend to worsen into steady failures.
Common symptoms
What you'll notice
- Check-engine light on
- Intermittent loss of power or limp mode
- Erratic or surging boost
- Hesitation under acceleration
Common causes
Most likely first
- Loose or corroded connector at the boost-control solenoid or actuatorLikely
- Chafed, broken, or intermittently shorting wiring in the control circuitCommon
- Faulty boost-control solenoid or electronic actuatorCommon
- Poor ground or intermittent power supply to the circuitLess often
- Failed engine control module driver (rare)Less often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data to capture the conditions when the fault appears.
- Wiggle-test the boost-control connector and harness while watching live data for dropouts.
- Inspect the solenoid/actuator connector for corrosion, backed-out pins, or looseness.
- Measure the solenoid resistance and check continuity of the control wiring.
- Repair the intermittent wiring or connector; replace the solenoid or actuator if it tests faulty.
FAQ
Quick answers
Is it safe to drive with P004E?+
For short trips, usually — but boost may cut out unexpectedly and the engine can drop into limp mode. Have the wiring and boost-control circuit checked soon.
Can I just clear P004E?+
An intermittent fault will return when the connection acts up again. The loose or chafed wiring, or the solenoid, needs to be found and fixed.
Related codes
Often seen with P004E
Read & clear P004E 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