TSB :LNF Charge Pipes

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Service Information 2008 Chevrolet Cobalt | Cobalt, G5 (VIN A) Service Manual | Document ID: 2195686
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#PIP4485: Low Boost, Reduced Power and/or DTC - keywords air cac charge control cooler driveability ecm engine gas hole lnf low maf mil P0101 P0299 P2178 pipe power reduced reducdpwrmde rub ses start stall - (Sep 26, 2008)


Subject: Low Boost, Reduced Power and/or DTC


Models: 2008-2009 Chevrolet Cobalt SS Only




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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
If a technician encounters a low boost/power condition and/or dtc, the following may help.

Recommendation/Instructions:
When a technician encounters a low boost/power condition and/or related dtc on a 2008-09 Cobalt SS they should inspect the right side CAC-(Charge Air Cooler) pipe for contacting a radiator support bolt. Due to the location of the CAC on 2008-09 Chevrolet Cobalts a radiator support bracket bolt on the right front may make contact with the lower charge air cooler/hose from below. This contact may cause the CAC to leak boost or vacuum if a hole is present. Review the illustration to see the location of the suspect bolt. A thick washer may be added to the bolt to increase clearance.

Note: Bulletin 07-06-04-029 should be used to diagnose the charge air system when leaks are suspected. This bulletin may be aided by using the evap smoke cart to introduce smoke to the CAC system.





(1) Right lower radiator support bracket

(2) Right front lower Charge Air Duct concern

(3) This bolt will wear a hole in the Charge Air duct

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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