Truck Won't Start - Batteries/Alternator Are Good

[AK Bob]

Is there a way to determine which sensor I have?

Unfortunately, your link is not working on my end.

It looks like the rear wheel speed sensor should be P/N 4779980AC.

https://www.Moparpartsgiant.com/part...4779980ac.html

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[jgruberman]

Should I be testing the end that goes to the wheel or the end that goes to the inside module?

Maybe I'm confused about how testing voltage to the inside module will determine which of the two sensors is bad.

Or also, very likely, I just don't understand the back-end functionality.

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[AK Bob]

Should I be testing the end that goes to the wheel or the end that goes to the inside module?

Maybe I'm confused about how testing voltage to the inside module will determine which of the two sensors is bad.

Or also, very likely, I just don't understand the back-end functionality.

Sent from my SM-S908U using Tapatalk

If you are testing for voltage unplugged, you want to measure the voltage to ground on each wire going to the ABS module.

This test will verify that you have the correct voltage from the ABS module and the wiring is good.

On the wheel or sensor side of the harness, the only thing you can do is measure resistance, but I don't believe that will help you much.

To test the sensor, you need to put an oscilloscope on the sensor wires and rotate the wheel to check the signal.

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[AK Bob]

If you can rent or borrow an Autel or Snap-on scanner, you would be able to scan the ABS module for codes and monitor and graph each wheel sensor while driving.

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[jgruberman]

If you can rent or borrow an Autel or Snap-on scanner, you would be able to scan the ABS module for codes and monitor and graph each wheel sensor while driving.

I just grabbed an Autel Scanner from Amazon that will be here today... I forgot I had a credit card I could use(but would rather not). It should be here today, so I will need to figure out how to test with that now

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[Corkey]

Let me know how that scanner goes

Should have charged 2 of them,

Let's say, an early Christmas present to Corkey?

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[jgruberman]

Let me know how that scanner goes

Should have charged 2 of them,

Let's say, an early Christmas present to Corkey?

Well apparently I also need to go fight Interstate for a second battery also and in case I lose that fight... might need another LOL. I wouldn't mind doing some sort of scanner sharing system or something though if this ends up working out and I got the right one.

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[jgruberman]

Here is a run through of the codes that are appearing with the Quick Scan of all modules:

https://photos.app.goo.gl/Ao4kgBMeGsbsAhRn9

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[jgruberman]

Also since one of the error messages had to do with tire size, I took my mm3 tuner and went into the change tire diameter menu and just tried to reprogram the tire size just for the heck of it.

I got this error message and after some googling I saw people talking about power and voltages not being correct and doing crazy things etc etc... I am wondering if all of this is caused by improper power handling by the batteries and I really need to go get that second battery replaced and that might fix all of the issues? Maybe these are all related to improper voltages and Power?

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[AK Bob]

Here is a run through of the codes that are appearing with the Quick Scan of all modules:

https://photos.app.goo.gl/Ao4kgBMeGsbsAhRn9

Sent from my SM-S908U using Tapatalk

I don’t see any trouble codes specific to the wheel sensors. I found information on the U041500 and C007886 see attached. Could not find any information on the U041800 code. I would start by trying to correct the incorrect tire size first (see C007886).

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