What are the common causes of P004E?

An intermittent open in the boost control A wiring or connector. A failing boost control A solenoid. A boost pressure sensor with an erratic signal. A sticking wastegate actuator. A loose boost control A ground.

Wiggle test the boost control A harness while watching the data. Measure the boost control A solenoid resistance. Compare boost pressure sensor readings to a gauge. Check the wastegate actuator for sticking. Check the boost control A ground for tightness. Clear the code and retest.

P004E

Turbocharger/Supercharger Boost Control A Circuit Intermittent/Erratic

System: Fuel and air metering (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P004E means Turbocharger/Supercharger Boost Control A Circuit Intermittent/Erratic.

Check these first

An intermittent open in the boost control A wiring or connector
A failing boost control A solenoid
A boost pressure sensor with an erratic signal
A sticking wastegate actuator
A loose boost control A ground

What to do next

Wiggle test the boost control A harness while watching the data
Measure the boost control A solenoid resistance
Compare boost pressure sensor readings to a gauge
Check the wastegate actuator for sticking
Check the boost control A ground for tightness
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.