In short, the FE9 trucks treat EGR system DTC’s as “non emissions” and simply stores a record of the fault with no corrective action. The key operational difference among these groups is how emission related DTC’s are processed. VCL is a CFF (Clean Fuel Fleet) designation required to qualify for certain tax incentives.NE1 is Northeast Emissions this covers NY, VT, MA, or ME.They can be identified by the RPO code label inside the glove box. The key difference between these vehicles is the emissions group. soot trap, and a closed crankcase ventilation (a.k.a. All engines utilize a cooled EGR (exhaust gas recirculation) system, catalytic converter a.k.a. Remember that the 2006 LLY groups with the LBZ. For simplicity sake from here on out I will refer to these engines as two separate groups: LLY and LBZ. All 2006 LLY and LBZ along with the 2007 “Classic” body style trucks are identical within their own special group. Duramax LLY engines are physically identical.
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