23 Yukon, 6.2. Wondering if anyone has had these codes with a check engine light. Curious what shit show I’m about to endure with the dealer……

[Tusz]

 

[blanchard7684]

P0690 is ECM sense circuit high. Something triggered high voltage to the ECM.
P016B3 is ECM self test Torque control monitoring fault.
P016BF is ECM ignition relay circuit 3 high voltage

my guess is

bad battery
bad ECM
or something happened electrically like a shorted wire or rodent damage to cause the high voltage faults.

 

[Joseph Garcia]

View attachment 445610

IMO, these are high level codes, which by themselves are almost meaningless to anyone who is not a GM mechanic. You need to see the deep codes generated by the control units which then trigger the CEL code.

If you want to get on top of this issue and have some confidence in the opinion of whoever you choose to check this out, I recommend that you get yourself a quality bi-directional scanner to add to your tool box. Then, you will be able to read ALL trouble codes, along with a brief explanation/pointer to the source of your issue. You will also be able to reset/delete trouble codes, after taking corrective action. You will literally save thousands of dollars in diagnostic and repair costs over the life of your truck, and you will most likely recoup the cost of the scanner within 1 year.

If you do not do any wrenching yourself, then perhaps you don't need a quality bi-directional scanner, but you will be at the mercy of whoever you choose to resolve this issue.

 

[bill1013]

IMO, these are high level codes, which by themselves are almost meaningless to anyone who is not a GM mechanic. You need to see the deep codes generated by the control units which then trigger the CEL code.

If you want to get on top of this issue and have some confidence in the opinion of whoever you choose to check this out, I recommend that you get yourself a quality bi-directional scanner to add to your tool box. Then, you will be able to read ALL trouble codes, along with a brief explanation/pointer to the source of your issue. You will also be able to reset/delete trouble codes, after taking corrective action. You will literally save thousands of dollars in diagnostic and repair costs over the life of your truck, and you will most likely recoup the cost of the scanner within 1 year.

If you do not do any wrenching yourself, then perhaps you don't need a quality bi-directional scanner, but you will be at the mercy of whoever you choose to resolve this issue.

Just curious…Where would you go about getting a bi-directional scanner and can you recommend one? Mele Kalikimaka and Hauoli Makahiki Hou!

 

[jfoj]

Need some advice - New Yukon AT4 Ultimate check engine light came on

And there is the rub, a quality bidirectional scanner that works with global b. I am currently trying to find one to purchase. I have access to MDI 2's but when I retire from GM, i want an aftermarket scanner to be able to repair my 21 Suburban. I work with some of the people who develop the GM...

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