2012 Yukon Denali

[gooffeyguy]

On my 2001 I have a Scanguage hooked up to the OBD port to view trans temp and a few other things while driving. Sometimes when I unplug it it makes the radio go a bit wonky. The clock will reset to 12:00 and switch to a non station like 87.5

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[swathdiver]

I took the Denali to the dealer today. I drove it all day yesterday and didn’t get a single misfire everything ran great. I started the car this morning and the remote start wouldn’t work, it would try to start it and die. But would start with key no problem. But all the electrical issues started again, gauges dropping to O then bouncing back up, blind spot freaking out, door locks going on and off, Traction and Stabilitrac lights on. Radio never quit, didn’t want to shift to save it’s life, had to put it in manual. About half way into the drive the line underneath the M was gone and it didn’t say what gear I was in. So I had to put it back into drive. Got to the dealership showed them what it was doing and he said my Bluetooth OBS2 scanner could be messing it up. So I unplugged it and within a seconds it all went away except the Traction, Stabilitrac, and Check Engine Lights. Anyone ever heard of this?

Yes, heard of it before on the pages of this forum. Missed the part where a BT scan tool was plugged into the ODBII port.

Have you done a compression test, leakdown and bore scope on the misfiring cylinder?

 

[iamdub]

Yes, heard of it before on the pages of this forum. Missed the part where a BT scan tool was plugged into the ODBII port.

Have you done a compression test, leakdown and bore scope on the misfiring cylinder?

I second this.

Lucas, #7 is one of the common failure cylinders from oil ingestion. You may have found the culprit for your electronic issues and you've done pretty much all the prerequisite troubleshooting for the cylinder misfire. Time to dig a little deeper and check the mechanical aspects of it.

 

[kbuskill]

I used to leave my BT OBD2 scanner plugged in all the time before installing my Kenwood HU...

I never had any of those issues. Just another point of comparison.

My BT scanner turns off automatically though when not in use after a certain amount of time though.

 

[Spookus]

Lucas, #7 is one of the common failure cylinders from oil ingestion. You may have found the culprit for your electronic issues and you've done pretty much all the prerequisite troubleshooting for the cylinder misfire. Time to dig a little deeper and check the mechanical aspects of it.

I took it to the dealer and had them look into it, I know they have the ability to check the VLOM. Also, I’ve never had any type of lifter tick or anything. So I’m praying its not a lifter or anything.