Lock control, entry, remote, keyless entry, start

Years 2007–09, 2014 Models 4 Factory citations 8

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Also documented for Buick Cadillac Chevrolet Hummer Pontiac Saturn

Documented applications

Acadia — first generation, Lambda (2007–2017)

2007–2008 Factory-verified

GM factory document — 2007 gmc acadia 2wd rpo code list, p.1.
GM factory document — 2008 gmc acadia 2wd rpo code list, p.1.

Sierra — GMT900 (2007–2013)

2009 Factory-verified

The list adds do not use after 2009 model year.

GM factory document — 2009 gmc sierra 2wd rpo code list, p.1.

Sierra HD — GMT900 (2007–2014)

2009, 2014 Factory-verified

the 2009 list adds do not use after the 2009 model year, but the 2014 guides print it (remote vehicle starter system)

GM factory document — 2009 gmc sierra 2wd rpo code list, p.1.
GM factory document — 2014 gmc sierra 2500hd fleet order guide wayback, p.2.
GM factory document — 2014 gmc sierra 3500hd fleet order guide wayback, p.2.

Yukon — GMT900 (2007–2014)

2007–2009 Factory-verified

The 2009 list adds do not use after the 2009 model year.

GM factory document — 2007 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2009 gmc yukon 2wd rpo code list, p.1.
2014 Single-source

the 2009 list says do not use after the 2009 model year, but the 2014 page still lists the code; GM Authority words it as remote vehicle starter system, now standard on SLE models per GM Authority's 2014 Yukon page (RPO Central; its Yukon, Yukon XL and Commercial Fleet lists); no factory list or order guide read for 2014; the page does not credit GM for its codes

This page aggregates every documented appearance of AP3 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.