2015 duramax lml

[2015 lml 3500 dually]

I read, I read and I read and I understand less and less, I have a 2015 LML with codes in the brake, mass air and ambient temperature sensors, the truck does not run more than 70 and has no power, and I have read that they fixed it with a tuner, someone around louisville kentucky who could help me? I can move 5 or 6 hours if necessary. I wait for an answer

 

[Ron Nielson]

Please post your codes.

I have read that they fixed it with a tuner

What was fixed with a tuner? And I assume you are still having problems? But your truck can still be driven, but power is limited?

 

[2004LB7]

As Ron said, post up the codes and any messages on the instrument cluster

 

[2015 lml 3500 dually]

Sorry for the first picture, the truck runs 85 miles max on downhill sloping roads.
"Happy Father's day for everybody"

 

[2015 lml 3500 dually]

 

[2015 lml 3500 dually]

Images

 

[2004LB7]

Where are you measuring them at? Ground or the other end of the harness? Ground will only correctly test one pin, the ground. The others will be running through the ECM and the readings will be of little use. Best results are from pulling the connector on the ecm and measuring the resistance of the harness. And a voltage drop test with a load would be good too

 

[2015 lml 3500 dually]

and how do I measure the pins in the ecm connector?

 

[2004LB7]

With your meter. One leed goes to the ECM side and the other leed goes to the sensor connector. Then the meter reads the resistance of the wire on the harness

For items like the brake pedal sensor you put both leeds on the ECM side and measures what the pedal resistance is

With the ECM connector hooked up, you can measure the voltage to ground at the sensor connector to see if it is correct.

If all looks good and you have a solid ground and supply to the sensor then that leaves the sensor or ECM as the next item that could be at fault.

 

[2015 lml 3500 dually]

so of the 3 plugs of the ecm which would it be? Once disconnected, do I measure, for example, the pin on the harness side and the pin on the ecm that matches? would that be with the truck off?

 

[2004LB7]

Harness side

Here are the ECM pinouts. I have no idea what connectors you are testing. But you can find the pinouts for those here:

https://www.gmupfitter.com/wp-content/uploads/2021/05/2014_Elec_HD_FS_CKTruck_100713.pdf

 

[2015 lml 3500 dually]

We are once again at the point where this is too much for me, so I am looking for someone who can do the work for me.

 

[2004LB7]

Location would help

 

[2015 lml 3500 dually]

i live in louisville ky but i don't mind moving 5-6 hours
I appreciate your help greatly

 

[ikeG]

I've had to replace the pins in that connector, they go bad and are hard to duplicate the issue when diagnosing

Sent from my SM-G960U1 using Tapatalk

 

[2015 lml 3500 dually]

Help Help Help?

 

[TheBac]

Since you obviously have no working knowledge of these trucks or how to diagnosis/repair ability, why the heck arent you taking this truck to a competent shop to get it fixed?
It is next to impossible to help from afar. This forum is NOT "Fixya".

 

[2015 lml 3500 dually]

That is what I want. A workshop!! I already took it to the dealer, several electrical ones, a workshop in Indiana and nobody finds a solution

 

[2015 lml 3500 dually]

By the way I like your avatar

 

[2004LB7]

Indiana is a large area to recommend shops for. Any closer location?