POWERSTROKE-P203F moderate Power Stroke ›

Reductant Level Too Low

The POWERSTROKE-P203F (Power Stroke) diesel fault code means: Reductant Level Too Low. 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
beginner
Estimated cost
$30 (DEF) up to $1,200 (sensor)
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What Are the Symptoms of POWERSTROKE-P203F?

  • DEF low warning
  • Countdown to limp mode starts
  • CEL

What Causes POWERSTROKE-P203F? (Most Likely First)

  • Actually low DEF Very Likely
  • Failed DEF level sensor in tank Likely
  • DEF quality sensor fault Possible

Can I Still Drive with POWERSTROKE-P203F?

Short distances only. POWERSTROKE-P203F is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.

Frequently Asked Questions

What is P203F on a 6.7L Power Stroke (Scorpion)?

P203F on a 6.7L Power Stroke (Scorpion) (2011-present) indicates: Reductant Level Too Low. This is a known diagnostic trouble code on this engine family and typically points to the causes listed above.

Can I drive with P203F 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 P203F?

Repair cost is typically $30 (DEF) up to $1,200 (sensor) 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-P203F?

  1. Top off DEF first -- if warning clears, you're good.

  2. If DEF is full but warning persists, DEF level sensor / quality sensor needs replacement.

  3. Scan DEF level and quality PIDs.

Sources 1

This page is built from documented references. Verify against your own service info before repair work.

  • SAE J2012Diagnostic Trouble Code Definitions (defines P203F as a generic OBD-II code)

P203F on Other Platforms

The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:

Duramax moderate Reductant Level Too Low Hino serious Empty Reductant Tank Isuzu serious Reductant Level Low — definition not reliably documented Kubota serious Reductant Level Too Low

Which Vehicles Commonly Get POWERSTROKE-P203F?

  • 2011-present Ford F-250 Super Duty 6.7L Power Stroke
  • 2011-present Ford F-350 Super Duty 6.7L Power Stroke
  • 2011-present Ford F-450/F-550 Super Duty 6.7L Power Stroke
  • 2015-2019 Ford F-650/F-750 6.7L Power Stroke

Explore More

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

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