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
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