Sluggish turning over push to start?

[jsams22]

2015 SLT Yukon.

Whenever I am going to start my Yukon, I push the button and there is a good .5 sec delay, then the engine turns over and starts. My last service at the GM dealership reported a DTC B1517 code, 03 - voltage below threshold. I just got the battery replaced 3 months ago, so I got it swapped out for a brand new one. You can tell there is a huge draw of power and all the lights on the instrument cluster go dim. Its a very similar feel to when your battery is going dead.

With the battery being brand new, and the battery terminal connections being solid. Where should I go next? Check the connections to the starter? Could the start being going bad and requiring more draw to turn engage?

 

[Joseph Garcia]

You may have already checked this, but is the battery ground cable to the block/chassis lug clean and tight at that endpoint?

 

[Big Mama]

Agreed start with all ground wires.

 

[jsams22]

You may have already checked this, but is the battery ground cable to the block/chassis lug clean and tight at that endpoint?

I have not looked yet. Trying to determine the best place to start.

 

[Big Mama]

That’s the best place to start and also the cheapest.

 

[sealandsky]

2015 SLT Yukon.

Whenever I am going to start my Yukon, I push the button and there is a good .5 sec delay, then the engine turns over and starts. My last service at the GM dealership reported a DTC B1517 code, 03 - voltage below threshold. I just got the battery replaced 3 months ago, so I got it swapped out for a brand new one. You can tell there is a huge draw of power and all the lights on the instrument cluster go dim. Its a very similar feel to when your battery is going dead.

With the battery being brand new, and the battery terminal connections being solid. Where should I go next? Check the connections to the starter? Could the start being going bad and requiring more draw to turn engage?

There is a ground terminal on the rear of the left cylinder head - hard to get to. I'd put that on the list of things to check.