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Noticed this over on the Acadia board, thought it would be of interest.

#14582 - Special Coverage Adjustment - Throttle Body - Reduced Power Mode

Condition
On some 2008 model year (MY) Saturn Outlook; 2008-2009 MY Buick Allure, Chevrolet Equinox, Chevrolet Uplander, Pontiac G8, Pontiac Montana SV6, Pontiac Torrent, and Saturn VUE; 2008-2010 MY Hummer H3 and Pontiac G6; 2008-2011 MY Cadillac CTS, Cadillac SRX, and Chevrolet Impala; 2008, 2011-2012 MY Chevrolet Captiva; 2008-2012 MY Buick Enclave, Buick Lacrosse, Chevrolet Colorado, Chevrolet Malibu, and GMC Canyon; 2009 MY Hummer H3T; 2009-2011 MY Buick Lucerne; 2009-2012 MY Chevrolet Traverse and GMC Acadia; and 2010-2012 MY Buick Regal vehicles, the throttle-position sensor may cause the engine to run rough, cause the malfunction-indicator lamp and/or an engine reduced power message to illuminate, and reduce the engine’s power.

Special Coverage Adjustment
This special coverage covers the condition described above for a period of 10 years or 120,000 miles (193,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership.

Dealers are to replace the throttle body assembly and gasket for Bosch equipped vehicles, or to install the throttle position sensor kit for Hitachi equipped vehicles. The Hitachi throttle body assembly only needs to be replaced if the sensor kit does not correct the condition. The repairs will be made at no charge to the customer. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after September 24, 2015, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to September 24, 2015, must be submitted to the Service Contract provider.
 

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I had the TB replaced on my 08 Outlook about a month ago by a dealership here in Richmond, VA

I had gotten the "limp mode" warnings (Engine Power Reduced / Service Stabilitrack / Service Traction Control).

I had it towed to the dealer, they confirmed it was throwing codes P0171 and P0300.

P0300 is multiple cylinder misfire, no specific cylinder. I read that for that code to activate the ECM had to detect 400+ misfires.

Anyway the TB was replaced at no charge, but they advised me it needed spark plugs and the lower intake manifold replaced.

They quoted me $700+

MY wife had been driving the car for several weeks with no major symptoms though she stated it "ran rough" occasionally.

I ordered the parts from RockAuto (OEM Delco Iridium plugs and FelPro gasket set for +/- $60) and replaced them yesterday.

I followed one of the better write ups ("Blue's Plain English Spark Plug Change for the GMC Acadia") and it was fairly accurate, though my manifold bolts were in slightly different locations and I had a few more electrical / vacuum connections to D/C (his is an 09 Acadia, mine is an 08 Outlook).

Plugs were easy once I got the intake off (which was a PITA), but putting it back on was an absolute terror.

Several write ups including Blue's indicate that replacing the upper gasket is not necessary and I noted that there was not one on the manifold when I pulled it off.

I beat the **** out of the lower gaskets trying to get it back on.

When I finally did and got everything reconnected and started the engine I got all the "limp mode" warnings again.

I am a dumbarse and neglected to D/C the battery before I started the work, so I D/C'ed it hopefully to allow the ECM to reset.

I won't get back to it until tomorrow morning due to work, but I hope that solves the problem.

Has anyone else done this job and replaced BOTH gaskets?

Or have any tips on putting that manifold back on without mangling the lower gaskets?
 
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