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2008 vs. 2009 transmission wiring ... PRNDL Switch

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2008 vs. 2009 transmission wiring ... PRNDL Switch

Old 02-13-2019, 04:00 PM
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Default 2008 vs. 2009 transmission wiring ... PRNDL Switch

My 2009 LY5 never had a PRNDL switch as it was internal to the trans., which was a pain in the *** when it came to swapping a 4L80E ... I had to get creative and add a PRNDL switch to the harness.
Now, my engine harness, over the years has been hacked and chopped ... and even though it works perfectly fine, I'm looking to get a new one from GM as they're not that expensive in the grand scheme of things.
wholesalegmpartsonline.com customer service wants to know if I have a wire at transmission connector cavity-6 ...

There are 2 different listings for the vin provided. Need to know with or without wire at cavity 6 on the transmission connector
20822434 HARNESS, ENG WRG (W/O WIRE AT CAVITY 6 FOR 4SPD TRANS CONN) (FOR 1ST DES SEE 20757824) C1 (03-53) 5.3-0 FLEX FUEL W/CYL DEACTIVATION (LMG),5.3J W/CYLINDER DEACTIVATION (LY5),4-SPD AUTO TRANS (M30), (2ND DES) 2009-2009 01 381.57 12H 3320A
20757824 HARNESS, ENG WRG (W/WIRE AT CAVITY 6 FOR 4SPD TRANS CONN) (FOR 2ND DES SEE 20822434) C1 (03-53) 5.3-0 FLEX FUEL W/CYL DEACTIVATION (LMG),5.3J W/CYLINDER DEACTIVATION (LY5),4-SPD AUTO TRANS (M30), (1ST DES) 2009-2009 01 340.84 12H 3320A

Well, the pins are alphabets, and yes, there is a wire at Pin-6 (F), which is the Transmission range switch A <--- the PRNDL switch that is now internal in the 2009. I guess there was a run of trucks that still had it external so it won't show on the harness??? If so, I should be getting that harness instead of the harness called out for my truck ... right? Or should I get the harness from a 2008, which still had the PRNDL switch in the harness? That'll be much easier. But my concern is if everything else is still the same on the harness except for that change.

There's still some re-wiring to do to get the truck to use a G3500 4L80E tune which I'm using now for the last 12000 miles, but that's minor. But having the PRNDL switch on the harness is gonna make it so much easier.
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