POWERSTROKE-P0478-64 moderate Power Stroke ›

Exhaust Pressure Control Valve High Input

The POWERSTROKE-P0478-64 (Power Stroke) diesel fault code means: Exhaust Pressure Control Valve High Input. This is a moderate severity code.

Unverified. We could not confirm this code's definition against freely available manufacturer documentation, so treat the meaning, severity and fix guidance on this page as unconfirmed. Check it against the manufacturer's service information for your exact model and serial range before acting on it. This page is kept out of search engines for that reason, and we are working through this family manual by manual.

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Keep driving?
Short distances only
DIY difficulty
intermediate
Estimated cost
$200-$900
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What Are the Symptoms of POWERSTROKE-P0478-64?

  • CEL

What Causes POWERSTROKE-P0478-64? (Most Likely First)

  • Stuck EBPV Likely

Can I Still Drive with POWERSTROKE-P0478-64?

Short distances only. POWERSTROKE-P0478-64 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.

Frequently Asked Questions

What is P0478 on a 6.4L Power Stroke?

P0478 on a 6.4L Power Stroke (2008-2010) indicates: Exhaust Pressure Control Valve High Input. This is a known diagnostic trouble code on this engine family and typically points to the causes listed above.

Can I drive with P0478 on my Power Stroke?

Only drive short distances to get to a repair facility. Continued operation may cause further damage.

How much does it cost to fix P0478?

Repair cost is typically $200-$900 depending on the underlying cause and whether you DIY or use a shop. Diagnostic time alone runs $100-$180 at most independent diesel shops.

Mechanics Guide Step-by-step diagnosis

How Do You Diagnose POWERSTROKE-P0478-64?

  1. Actuate valve.

  2. Clean or replace.

Which Vehicles Commonly Get POWERSTROKE-P0478-64?

  • 2008-2010 Ford F-250 Super Duty 6.4L Power Stroke
  • 2008-2010 Ford F-350 Super Duty 6.4L Power Stroke
  • 2008-2010 Ford F-450/F-550 Super Duty 6.4L Power Stroke

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More Power Stroke codes → Diesel home All diesel codes Heavy-duty Guides

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