05 Envoy TAC Module location

Would someone kindly inform me where the Throttle Actuator Control Module (TAC) is located? I own an 05 Envoy Denali 5.3 AWD.
Have a replacement unit but can't locate that pesky sucker. Thanks in advance.
 

Mounce

Well-Known Member
Built into the electronic throttle body is it not?
 

Mooseman

Moderator
That part is not for our platform at all.


Clicking on the part number brings up vehicle it's for:

CADILLACESCALADE2003-2005
CHEVROLETAVALANCHE 15002003-2005
CHEVROLETAVALANCHE 25002003-2005
CHEVROLETSILVERADO 15002003-2005
CHEVROLETSILVERADO 25002003-2005
CHEVROLETSILVERADO 35002003-2005
CHEVROLETSUBURBAN 15002003-2005
CHEVROLETSUBURBAN 25002003-2005
CHEVROLETTAHOE2003-2005
GMCSIERRA 15002003-2005
GMCSIERRA 25002003-2005
GMCSIERRA 35002003-2005
GMCYUKON2003-2005
GMCYUKON XL 15002003-2005
GMCYUKON XL 25002003-2005
HUMMERH22003-2007
 

Mounce

Well-Known Member
Ah yeah I know in the full size models that's right by the booster. And I know the 6cyl guys don't have it. But with you having the v8 I could see you having it like the full size. Should still be near the booster/fuse block though as they'd use a very similar harness layout.
 

Mooseman

Moderator
AFAIK, nope. Not even the V8 on this platform according to that list.

@JohnScarfiJr , did you get a code pointing to something in the throttle system?
 
OP
OP
J

JohnScarfiJr

Member
Have repeatedly had a P2101 (TAC Module)
out of range. A clearing of th the codes solves it for a week or so. Sourced the part through Summit Racing and it's listed there. As a V8 I think it should be the same as other applications ie., pickup truck. I will go to the local Dick Norris GMC dealership and get an answer. Let you all know. As a retired aircraft mechanic I seldom get a true challenge so off on a treasure hunt I go. Toodles!
 

budwich

Well-Known Member
... can't find any reference in GM si. Denali not really broken out... just motor options. None of which show any seperate module from the throttle body itself.

picture of a tahoe shows it in the top right corner of the fire wall (looking at the engine).

an actual picture of your particular motor / thottle body will likely clear up the issue quickly.
 
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budwich

Well-Known Member
:smile: "passing ships in the night".... no problem. If you post a picture of the throttle body on your truck, the forum will likely solve this for you.

NOTE: the P2101 code doesn't actually mean you have a seperate TAC module from the throttle body.
 

Mooseman

Moderator

Reprise

Lifetime VIP Supporter
Rock lists it for the '03-'04, with same picture.

BUT - when I search Google images (5.3, year irrespective), everything points to the throttle body.

Here's the part listing from Rock:
BUICKRAINIER2004
CHEVROLETSSR2003-2004
CHEVROLETTRAILBLAZER2003-2004
GMCENVOY2003-2004
ISUZUASCENDER2003-2004

I will take a look later today, when I'm near my Voy. From the pics I see on Rock, I'm guessing it's an 'outside' part (e.g.; somewhere in the engine compartment). But that's ONLY a guess. Will post back later.
 

Reprise

Lifetime VIP Supporter
Think I found it. Look over at your brake booster, up / to the right, under the cowl (about '1 o'clock')

I'll post pics later (directly from my phone would be ginormous)
 

Mooseman

Moderator
I may have found something however may not help. Looking at GMPartsDirect, I found this:

04 TCM.jpg

But man that looks a LOT like a PCM.
 

budwich

Well-Known Member
Here is the TB. No good on the booster area. Again it's a 5.3 AWD Denali
while the throttle body looks like the "normal" throttle actuated control motor system. I doubt there is another seperate module. Just follow the cable leave the throttle body and see where it goes... most likely to the PCM. where is your pcm mounted?
 
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Reprise

Lifetime VIP Supporter
Here is the TB. No good on the booster area. Again it's a 5.3 AWD Denali
Well, I don't have the fancy-pants Denali, but my '03 XL *is* a 5.3, friend. :smile: That's why I jumped in the post.

Anyway, here's what mine looks like...and it looks like they changed things up in '05, based on your pics. Oh, and gentle admonishment... it should be a 4WD, not an AWD.

If you want me to snap my TB, let me know (sorry it's not visible in the wide shot)

88620

88621

(only the one plug is visible here, but there's a second one behind it - I checked.)



On edit:

Quoth @Mooseman - 'But man that looks a LOT like a PCM.'

It is...there are two part #4's listed, same 8-digit part #.
I guess what they're trying to show is that the TAC is integrated (?) into the PCM -?

GM doesn't usually list parts that way, though.
 
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Reprise

Lifetime VIP Supporter
NP. FWIW, I don't think it's a case of 'yours being located somewhere else', but rather 'the '05-up don't have them' (external modules)
 

littleblazer

Gold Supporter
Iirc the 360 platform adopted things as test runs before the rest of the lineup got it. (Side curtain air bags, auto diming mirrors etc.) The 07+ full size trucks have the module integrated and I would believe the same goes for your 05.
 

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