2019 yukon xl No Start

[T_Brad]

2019 yukon xl 5.3. Problem started with the occasional no start when starter button was pressed. Then it would work on the second try. Over the next two weeks it would happen more often, until we got to a point where it would not start at all. (Vid 1)
- battery tested all good.
- replaced starter. This did nothing.
- starter relay appears to be fine (See vid 2)
- starter fuse is good
- ecu module is tight and seated well. (I have not pulled it to look for corrosion or wire problems beneath it

When i try to start I get a single click. (See vid 3) Single click when trying remote start, and single click when trying to jump at starter relay (See vid 4)

Can someone help me on what my next test should be, or point me in the right direction with a similar problem they solved? 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.

I can give you some initial pointers, but other members of this Forum much more knowledgeable than me in this area will chime in.

You say that the battery tested good. Did you have it load tested on a bench with an actual load tester unit?

Check the Ohm resistance of the battery cables. They often look good on the outside, but are corroded on the inside, but an Ohm test should determine the condition of the cables.

 

[blondie70]

Mine did about the same thing and I found the ends of the battery cables (that attach to the battery) were kinda glazed . I used a pocket knife and a battery terminal brush to clean them up. Worked ok then. Good Luck

 

[Fless]

I would suggest a voltage drop test to confirm main cable integrity and capacity to handle a load:

 

[T_Brad]

Thanks again for the replies. So I am an idiot and realized when I was jumping at the fuse block I was on the run/crank relay, not the starter relay. Picked up a multimeter and started testing all things battery related. Grounds, Bus, etc. I have no power to post 30 of the starter relay. So I am down to the Nuetral Safety Switch, Anti-theft, or a bad contact for battery power or ground at the fuse block. Before I get into removing all the cable protection would anyone have a wiring schematic.

Also some additional info I should have stated in my original post. No corrosion on anything. Engine compartment is really clean. A shade over 70K miles.

Am I missing anything else I should be testing.

 

[cjheath1]

same thing on my 15 yukon, replaced neg cable per gm Bulletin No.: 18-NA-161. and push buttion was ok , later about 3 mos the starter went out .

 

[Dannyo]

Thanks again for the replies. So I am an idiot and realized when I was jumping at the fuse block I was on the run/crank relay, not the starter relay. Picked up a multimeter and started testing all things battery related. Grounds, Bus, etc. I have no power to post 30 of the starter relay. So I am down to the Nuetral Safety Switch, Anti-theft, or a bad contact for battery power or ground at the fuse block. Before I get into removing all the cable protection would anyone have a wiring schematic.

Also some additional info I should have stated in my original post. No corrosion on anything. Engine compartment is really clean. A shade over 70K miles.

Am I missing anything else I should be testing.

Did you make any progress? I just experience this same issue a few days ago. Took the battery off to get it tested and all is good. I have not start , no cranking. just one click. 2019 Yukon XL. I only have about 66k miles. So no corrosion on cables at all.

Dannyo

 

[Doubeleive]

Did you make any progress? I just experience this same issue a few days ago. Took the battery off to get it tested and all is good. I have not start , no cranking. just one click. 2019 Yukon XL. I only have about 66k miles. So no corrosion on cables at all.

Dannyo

a click generally means low voltage even if the cables look ok
does the starter work if you bypass the starter relay?
what is the voltage to the starter when the click happens?
if you have good voltage and the relay bypass does not work either then consider pulling the starter to bench test.
if you have push to start, some have reported the button being defective as well, but the relay bypass should rule that in or out.

 

[Dannyo]

a click generally means low voltage even if the cables look ok
does the starter work if you bypass the starter relay?
what is the voltage to the starter when the click happens?
if you have good voltage and the relay bypass does not work either then consider pulling the starter to bench test.
if you have push to start, some have reported the button being defective as well, but the relay bypass should rule that in or out.

Thanks for the info! Question, how does one go about bypassing the starter relay? Adding a wire jumper? Read something about jumping 85 to 86 or something like that. appreciate the help!

Dannyo

 

[Doubeleive]

Thanks for the info! Question, how does one go about bypassing the starter relay? Adding a wire jumper? Read something about jumping 85 to 86 or something like that. appreciate the help!

Dannyo

 

[Fless]

Funny what can be found using some g00gle-fu.

 

[Dannyo]

I went ahead and bypass the starter relay, only got a click from the starter. I tried a few times and heard one click each time I jumper across the two terminals. So does that mean the starter needs replacing?

 

[Dannyo]

I opted to replace the starter. It worked after the replacement. It was an easy install.

Once I did the starter relay bypass test, I knew it had to be the starter as the batter was tested successfully.

Hope this helps the next one with the same issue.

Thanks everyone for your help!

Dannyo

 

[Doubeleive]

I opted to replace the starter. It worked after the replacement. It was an easy install.

Once I did the starter relay bypass test, I knew it had to be the starter as the batter was tested successfully.

Hope this helps the next one with the same issue.

Thanks everyone for your help!

Dannyo

to circle back on that. bypassing the relay would indicate 2 things either bad starter or low voltage to the starter.
you could then do a voltage drop test and/or pull the starter and do a bench test by applying 12v directly to the starter.
many autoparts stores offer free starter testing as well
if the starter then passes testing and voltage is good, then you have to look at things like starter alignment with the flexplate which is often fixed with a spacer
and then it progresses to is the engine seized? it just goes step by step.
glad you got it sorted out.

 

[T_Brad]

Just wanted to jump back on here and update. All of the extra diagnostics were for nothing. It was the starter. Turns out that the wiring harness to the starter solenoid had a small piece of the retainer clip that had broken off and lodged in the female connection side and was preventing contact. Way back in the process, after I had replaced the starter and was still having issues, I had pulled the wheel and wheel well so I could get a good look at the starter and test voltage, resistance, and grounding. I had originally changed it blind from underneath and knew the retainer clip had busted when removing the harness. The harness was pulled but I didn't actually look inside it. I did my testing and repalced it and had a nice solid "click" to know it was connected securely.

After I reached the end of my capabilities without having and OBD2 Scanner, I hauled it in to a mechanic. He said he literally pulled the harness off and when he did the plastic piece fell out. He plugged it back in and it fired right up. I still wake up in the morning in disbelief on all the stuff I looked at as potential problems when it turned out to be the starter after all.

 

[Geotrash]

Just wanted to jump back on here and update. All of the extra diagnostics were for nothing. It was the starter. Turns out that the wiring harness to the starter solenoid had a small piece of the retainer clip that had broken off and lodged in the female connection side and was preventing contact. Way back in the process, after I had replaced the starter and was still having issues, I had pulled the wheel and wheel well so I could get a good look at the starter and test voltage, resistance, and grounding. I had originally changed it blind from underneath and knew the retainer clip had busted when removing the harness. The harness was pulled but I didn't actually look inside it. I did my testing and repalced it and had a nice solid "click" to know it was connected securely.

After I reached the end of my capabilities without having and OBD2 Scanner, I hauled it in to a mechanic. He said he literally pulled the harness off and when he did the plastic piece fell out. He plugged it back in and it fired right up. I still wake up in the morning in disbelief on all the stuff I looked at as potential problems when it turned out to be the starter after all.

Thanks for coming back to update this thread with these details. It will help other members here in the future. And I think most of us have stories just like this. In my case it was lifter trays - I had 2 cam failures before I discovered it was cheap aftermarket lifter trays (sold to me as being OEM, but weren't) that were allowing the lifters to twist just enough to be damaged and in turn damage the cams. I troubleshot for weeks until I figured out what was happening.

 

[Bobs1]

2019 yukon xl 5.3. Problem started with the occasional no start when starter button was pressed. Then it would work on the second try. Over the next two weeks it would happen more often, until we got to a point where it would not start at all. (Vid 1)
- battery tested all good.
- replaced starter. This did nothing.
- starter relay appears to be fine (See vid 2)
- starter fuse is good
- ecu module is tight and seated well. (I have not pulled it to look for corrosion or wire problems beneath it

When i try to start I get a single click. (See vid 3) Single click when trying remote start, and single click when trying to jump at starter relay (See vid 4)

Can someone help me on what my next test should be, or point me in the right direction with a similar problem they solved? Thank you in advance.

Have you been able to fix this?? Having similar issue with same make model vehicle.

 

[Miami-Dade]

After I reached the end of my capabilities without having and OBD2 Scanner, I hauled it in to a mechanic. He said he literally pulled the harness off and when he did the plastic piece fell out. He plugged it back in and it fired right up. I still wake up in the morning in disbelief on all the stuff I looked at as potential problems when it turned out to be the starter after all.

Have you been able to fix this?? Having similar issue with same make model vehicle.