What are the common causes of P0476?

A failed exhaust pressure control valve A. A valve A stuck partway. An erratic valve A actuator signal. Carbon binding the valve A. An ECM fault on the valve A control.

Command exhaust pressure control valve A through its range. Inspect valve A for carbon and sticking. Check the valve A actuator wiring. Verify valve A moves smoothly. Replace valve A if it does not track. Clear the code and retest.

P0476

Exhaust Pressure Control Valve A Range/Performance

System: Auxiliary emission controls (P code)
Lamp: Check Engine Light
Category: Powertrain - Auxiliary Emissions Controls

What it means

P0476 means Exhaust Pressure Control Valve A Range/Performance.

Where it lives

For P0476, start at the valve the description names.

Check these first

A failed exhaust pressure control valve A
A valve A stuck partway
An erratic valve A actuator signal
Carbon binding the valve A
An ECM fault on the valve A control

What to do next

Command exhaust pressure control valve A through its range
Inspect valve A for carbon and sticking
Check the valve A actuator wiring
Verify valve A moves smoothly
Replace valve A if it does not track
Clear the code and retest

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Updated

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