DTC P0300 Setting after Engine Repairs

DTC P0300 (Engine Misfire Detected) may set after performing engine repairs on the following vehicles equipped with a V8 engine:

• 2004-2007 Rainier

• 2008-2009 LaCrosse, Allure (Canada Only)

• 2006-2013 CTS-V

• 2002-2013 Escalade

• 2010-2013 Camaro

• 2011-2013 Caprice PPV

• 2002-2013 Avalanche

• 1999-2013 Express, Silverado, Suburban, Tahoe, Savana, Sierra, Yukon

• 2002-2014 Silverado HD, Sierra HD

• 2009-2013 Colorado, Canyon

• 2003-2009 Trailblazer, Envoy

• 2006-2009 Impala SS

• 2006-2007 Monte Carlo SS

• 2003-2006 SSR

• 2005-2013 Corvette

• 2003-2010 Hummer H2

• 2008-2010 Hummer H3

• 2008-2010 G8

• 2005-2006 GTO

• 2005-2008 Grand Prix GXP

• 2005-2009 Saab 97X

 

It is possible to have the fuel injector electrical connectors crossed for cylinders 5-7 and 6-8, which may cause an engine misfire. The engine misfire may not be detected and may happen during deceleration.

 

If crossed injector connectors may be a possible cause, follow the appropriate Service Information to validate the injector connector routing. (Fig. 17) If necessary, correct the injector connector routing and evaluate for proper operation.

 

F17 injector routing 1

Fig 17

 

– Thanks to Richard Renshaw

 

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