2010 Yukon Denali phantom electrical issues

[astrozombee]

My 2010 Yukon Denali was giving me a plethora of issues:

   Door locks randomly actuating

  Gauges jumping all over while running,

  fuel gauge not reading at all

  radio restarting while running

  Stablitrak turning off randomly

  Wouldn't turn over for start

  and many more

I replaced the battery cable to ground/block, and block to firewall connections

this solved many of the phantom issues.

 

the two remaining are

  won't turn over for starting

  fuel gauge stays off

Some times re-seating the fuse box under the hood will allow proper function

However this only happens when the vehicle is sitting still on sunny days warmer than 85 Degrees. Or in direct sunlight for a few hours of 80 degrees.

 

My mind tells me that some plastic connector is expanding in the heat just far enough to break an electrical connection, or a broken molded piece in the fuse box. Any input would be appreciated.

 

I am very certain it is just a simple connection issue. the vehicle runs fine 11 months out of the year, only issues pop in the summertime, and then only on the hotter of the days here in Pennsylvania.

 

I've sent it to the dealership a few times, they replace some sensor and it seems to be fine, until it gets hot again. My dealership does not know how to trouble shoot, if the computer doesn't tell them what is wrong they are clueless. However with phantom electrical issues bad codes are gong to happen.

 

 

 

Edited September 6, 2019 by astrozombee

[astrozombee]

Checked on it today, 80 and super sunny, it would not start. Pulled the fuse junction box, very hot. After blowing it down, and moving around some relays that felt hotter than they should it fired up again.

Not sure if it's just weak relays, or corrosion inside the junction box itself. So, i just ordered a new junction box with all new relays from GM Parts Store.

[Ak_grown]

have the ground cable tested or replaced. there was a stint of poorly constructed ground cables that caused  issues for many owners. 

[astrozombee]

I put a complete brand new fuse box with all new components in, and it still has the no start failure when sitting in sunlight.

Symptoms that persist when the temperature of the vehicle(not cooling system) get to around 90-100

    the system seems to work but

              it won't engage the starter

              the fuel guage does not move when key is turned on(everything else in the                                                                                                 cluster appears to be normal)

              DIC warns of 

                      Check Suspension System

                      Side monitoring system error

                      Stabilitrack offline

 

 

After opening the hood and opening the windows for about 10 minutes the vehicle will start.

 

Something about heat is making a bad connection.

or

Are there any heat regulated sensor for the interior of the vehicle?

 

[astrozombee]

On 9/8/2019 at 1:42 PM, Ak_grown said:

have the ground cable tested or replaced. there was a stint of poorly constructed ground cables that caused  issues for many owners. 

The ground wire to from batter to block and frame was the first thing replaced and that cleared up a lot of the issues.

[swathdiver]

A bad cell in a battery that passes a load test can wreak havoc on our electrical systems.  How old is the battery?  This appears to be heat related and it could be the battery or the ECM at this point as you've covered most of the others.  Consider replacing the battery regardless of its age.

 

A Tech-2 can be very helpful in situations like this.

Edited September 26, 2019 by swathdiver

[astrozombee]

So after a year of these intermittent issues we think it's cured.

 

The Body Control Module seems to be the culprit.

After replacing the BCM, the vehicle never hesitated to start on 95 degree days after multiple tests.

 

[Jason In DLH]

That’s interesting to hear as I just had some crazy things going on too (radio and lights wouldn’t shut off, truck wouldn’t start unless I removed both battery terminals and reinstalled them) and just out of luck I took out and reinstalled the BCM fuse and everything is back to normal again.

[Rhonda]

Any new updates.  I have done everything listed but after a few months, right back to same problems.  Stabilitrak, check engine light.....the whole nine yards!  

[swathdiver]

On 9/9/2022 at 4:44 PM, Rhonda said:

Any new updates.  I have done everything listed but after a few months, right back to same problems.  Stabilitrak, check engine light.....the whole nine yards!  

 

How old is your battery?