Loose Charge Air Cooler Ductwork

Loose connections of the charge air cooler ductwork on some 2017 Silverado and Sierra models equipped with the 6.6L Duramax diesel engine (RPO L5P) may result in an illuminated Check Engine light and DTCs P0101, P0299, P11CC, P11DC, P20EE, P2002 and/or P2463 set.


If any of the DTCs are set, check for loose charge air cooler ductwork at the turbocharger outlet pipe, the charge air cooler inlet pipe, the charge air cooler outlet pipe, and the connection at the intake air flow valve (throttle body). (Fig. 9) The loose ductwork is most likely to become disconnected during engine roll or brake torque.


Fig. 9


Also check for proper alignment of the charge air cooler pipe bracket and bolt hole. (Fig. 10) The bracket and bolt hole may require realignment after the charge air cooler outlet hose is properly connected to the throttle body.


Fig. 10


– Thanks to John Stempnik

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One Comment

  1. Adam Hoffer says:

    I just had this on an ’18 too. Had code p20ee.