OBD-II Code
P0476
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$20–$1,400
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
$20 (cleaning) to $1,400 (VGT clean + up-pipe gaskets + labor).
P0476 means the Exhaust Back Pressure Control Valve is moving, but the resulting back pressure (or position) is outside the ECM's expected window for the commanded duty cycle — this is the classic 'range/performance' fault that says the part is electrically alive but mechanically not doing its job.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP0476 means the Exhaust Back Pressure Control Valve is moving, but the resulting back pressure (or position) is outside the ECM's expected window for…
P0476 means the Exhaust Back Pressure Control Valve is moving, but the resulting back pressure (or position) is outside the ECM's expected window for the commanded duty cycle — this is the classic 'range/performance' fault that says the part is electrically alive but mechanically not doing its job.
Cheapest-first ladder
- Visually inspect the valve butterfly and stem — soot accumulation on the butterfly reduces effective restriction even when the actuator reports full closure, so the commanded back pressure target is never reached.
- Scan live data and watch commanded vs. actual back pressure during a bidirectional valve sweep. Expected ranges by platform: gas turbo applications target 5-30 psi back pressure at commanded restriction, diesel platforms target 30-50 psi at full restriction with the exhaust brake engaged. Position feedback should track command within 5 degrees across the 0-90 degree sweep, and motor current should sit in the 0.5-2.0A band during steady-state hold. Position tracking command but back pressure not building means a mechanical problem (sooty butterfly, leaking exhaust upstream of the valve, cracked manifold dumping pressure).
- Smoke-test the exhaust upstream of the valve — a cracked exhaust manifold or leaking up-pipe gasket bleeds off back pressure and makes a perfectly good valve look broken. Expensive-misdiagnosis caveat: diesel EBP valves seize from soot accumulation — clean before replacing; a $20 cleaning saves the $300 valve. Run an active regen first to clear the buildup if scan tool supports it.
Vehicle-specific patterns2003-2007 Ford 6.0L Powerstroke throws P0476 when the EBP control valve butterfly has enough soot buildup that even fully-commanded closure doesn't r…
- 2003-2007Ford 6.0L Powerstroke throws P0476 when the EBP control valve butterfly has enough soot buildup that even fully-commanded closure doesn't reach target back pressure — disassembly and cleaning is the standard fix and is documented in OEM bulletins. Watch for cracked up-pipes feeding the turbo on the 6.0L too; they crack at the bellows and bleed boost upstream of the EBP valve, mimicking a bad valve.
- 2008-2010Ford 6.4L Powerstroke pairs P0476 with DPF regen codes when the valve can't generate enough exhaust heat to support regen.
- 2011-2016Duramax LML and 2017+ L5P run the EGR cooler bypass valve with similar performance-fault logic; a sticky bypass valve trips functionally identical codes.
- 2007-2018RAM Cummins 6.7L throws P0476 when the VGT vanes are soot-bound and can't achieve the commanded restriction; the turbo cleaning service is the canonical fix and runs ~$400-800 in labor depending on access.
- 2009-2014VW 2.0 TDI uses an EGR throttle valve with similar performance monitoring. Common diesel concern: soot-bound EBP valves and cracked up-pipes from extended highway non-regen cruise mimic each other — recommend active regen and smoke-test before parts.
Estimated repair$20 (cleaning) to $1,400 (VGT clean + up-pipe gaskets + labor).
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