Considering 09 denali hybrid, but has issues. Advice Appreciated.

[Kelborn]

Hello all.

Read through the forums and have already gained some insight to my situation.
Considering purchase of a 2009 Yukon Denali Hybrid. Has 137,*** miles and is in immaculate condition.

First issue is the vehicle wouldn't start when I went to see it. Was able to jump start the truck and it ran ok. Took it down the road and tested the 4x4 dial, when I changed into another setting the truck died completely. Was able to get it restarted and drive back. Would then have intermittent issues where it wouldn't crank at all. Wasn't showing any codes at that point, but the "service hybrid system" warning was on. Went back the next day with a multimeter and the 12v tested fine, all voltages normal.

Did show a stored code today for P2797 which i understand is a known issue on these. (If anyone knows where I can actually source the pump, I am having trouble finding one).

My main worry is the hybrid battery, being a 16 year old vehicle I think it needs replacing. I know how to change them out now thanks to a very detailed video I found but I would like to test this thing to make sure that this is indeed the problem. Anyone have any advice on how to proceed?

His ask price is $6,000 and as far as I can tell there is zero issues other than the above described.

Thank you in advance!

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

My first thought is that the battery needs replacement. You cannot properly test a battery with a volt meter, as the available cranking amperes is what is really critical to start the truck, and not voltage. I recommend, if possible, that you pull the battery and take it to a local auto parts store that has a battery bench tester and get it tested.

I'd also suggest that you get a price in the hybrid battery, as it could very well be a cost item for you in your first few years of ownership.

I'm not familiar with hybrid trucks, but other members of this Forum much more knowledgeable than me in this area will chime in.

 

[j91z28d1]

you'll need a better scanner to read the hybrid codes and without those you're just guessing what's going on.

if you are a diy guy and like working on stuff, factor in a tech 2 scanner, around 300$ and a replacement hybrid battery. I don't know the going rate. most all are used cells as gm doesn't sell a pack anymore. so you're getting used prius cells. get the longest warranty battery. I'm currently testing the sodium based replacement cells and it's going well so far.

they aux pump for the tranny is almost always just wiring. there's a upgrade and a tsb about the harness. but I've seen people having a hard time finding them these days. hard wiring it is probably the easiest.

the problem with these trucks even thou really like mine is they have all the normal truck issues, like the afm and everyone they wears out. plus a hybrid battery that gets. weak and makes tkem drive badly. and if you're up north, all the wiring issues that normal gm's have plus more wiring for hybrid stuff.

I wouldn't buy it till you get a full code scan, for reference my 2011 yukon has 32 modules. and the look up the code here and see what you think.