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Unfortunately P0641 is kind of a generic 'placeholder' sensor communication error. If you do a Google search on the error and then change to 'Images', you get a sea of chewed up, melted, and corroded harnesses and connectors. It is the 'Short To Voltage' error for quite literally every single sensor on the car.
Hopefully it triggered an associated error as well so at least there was some sort of bread crumbs left for them to follow. I'm sure they will find it if the shop has a good tech with experience on troubleshooting electronics. Unfortunately these issues can take a lot of time to narrow down.
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2010 CGM Camaro 2SS LS3 Swapped A6 - GPI LS3 SS1 .647/.638, (224/237, 112 +4, 7º overlap) on CamMotion 8620 core, BTR Platinum .660" Dual Spring kit w/titanium retainers, CHE bronze trunnion upgrade, stock heads milled @ .015, Melling HV 10296 oil pump, TSP 1-7/8" long tube headers (W/Catless Off-road Pipes), Corsa Xtreme 3" Catback, GPI Ported/Rod Mod Intake, Stage 2 Ported Throttle Body, Vararam OTR CAI, Mike Norris Gen 2 catch can + GM 1LE clean side separator, 160º thermostat - Megan Racing adjustable coilovers (lowered 1.75"), MRR M017 10/11" wheels-Tuned by Ryan @ GPI
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