Random/Multiple Cylinder Misfire Detected
The POWERSTROKE-P0300 (Power Stroke) diesel fault code means: Random/Multiple Cylinder Misfire Detected. This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- advanced
- Estimated cost
- $200-$9,000
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Common Symptoms
- Rough run
- Flashing CEL
- Loss of power
Probable Causes (Ranked by Likelihood)
- Failed injector harness Likely
- Low fuel pressure (failed K16 pump) Likely
- Multiple damaged pistons Possible
Step-by-Step Diagnostic Procedure
Check HPFP pressure and fuel delivery.
Log misfire counters by cylinder; if random, fuel system is the focus.
Inspect injector wiring harness under valve cover.
Frequently Asked Questions
What is P0300 on a 6.4L Power Stroke?
P0300 on a 6.4L Power Stroke (2008-2010) indicates: Random/Multiple Cylinder Misfire Detected. This is a known diagnostic trouble code on this engine family and typically points to the causes listed above.
Can I drive with P0300 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 P0300?
Repair cost is typically $200-$9,000 depending on the underlying cause and whether you DIY or use a shop. Diagnostic time alone runs $100-$180 at most independent diesel shops.
P0300 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: