A 2007-08 Express, Kodiak, Silverado, Savana, Sierra or Topkick equipped with a 6.6 Duramax Diesel Engine RPO code LMM may experience an intermittent DTC P009E for fuel rail pressure relief valve performance setting.
Complete the current SI diagnostics for any symptoms or trouble codes set. P009E will set
if the ECM interprets a rapid loss of fuel rail pressure.
If the current SI diagnostics for P009E are inconclusive, there has been an updated calibration released to address intermittent P009E.
Reprogram the ECM with the latest calibration and evaluate the concern.
- Thanks to Donald Langer
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