DTCs: What Are They And What Causes Them?

Part 3

Published in the June 2008 Issue June 2008 Feature, PowerStroke

The most common DTCs are P0403, P0404 and P0405. Below are the definitions, and if you haven't modified your vehicle, then the EGR valve is the most likely cause.

  • P0403: EGR Exhaust gas recirculation control circuit: open circuit, short to ground, short to voltage, faulty valve, faulty PCM.
  • P0404: EGR Exhaust gas recirculation control circuit range/performance: difference between command and actual exceeds a specified limit.
  • P0405: EGR Exhaust gas recirculation sensor: a circuit low voltage below a specified range.
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