P129F Chevy Cadillac and GMC fuel pump power control module

[@advancedleveldiagnostics]

Great diag, very thorough! Thanks for sharing!

[@DallasAutoDiag]

Thanks buddy

[@bigcat1067]

Thank you very much for using basic tools . I find myself limited to these but hopefully soon a simple oscilloscope

[@DallasAutoDiag]

Which oscilloscope are you planning to buy?

[@nickayivor8432]

Can't wait for the next video 👍 SHARP Dallas Auto Diag From Nick Ayivor from London England UK 🇬🇧 ⏰️ 07:44am Good Morning 🙏 🌄

[@DallasAutoDiag]

Thanks Nick

[@alexanderkasyanov4946]

this is a really good video, thank you for sharing the info! 1 concern - if the fuel pump uses AC voltage, why do you keep your voltmeter in DC setting to measure voltage? thanks

[@josheberst1768]

@DallAutoDiag Is there a special trick to getting the bracket down with the fuel module? I tried throwing a 10mm on the two most obvious bolts and it seems like they are spinning. The ones at the top and bottom of the bracket at 10:40.

[@josheberst1768]

Answering my own question for anyone else. You'll need an e-torqx socket set and a wrench. 10mm or adjustable. Hold the wrench on the nut and loosen each screw only a little bit with the socket. Then you can lift the bracket out of the holes.

[@DallasAutoDiag]

Sorry it wasn't me that dropped it down. It was like that when I get there but I see you got it figured.

[@DallasAutoDiag]

Thanks for sharing.

[@josheberst1768]

After putting it back up I'm not sure you need the wrench. The e-torx socket might be all that's needed. This fuel control module made me stop in the middle of the road with no ability to shift to Neutral. After dealing with this stupid thing I'm going to keep a pair of wheel chocks, a wrench and a zip tie in the car. The procedure in this video is a must know for all Suburban, Yukon, Escalade owners. kzbin.info/www/bejne/n4TEgXWBi56WpLM

[@diydantex6150]

When you talk about 3 phase motors I am thinking that you could measure ac voltage between any 2 of the phase wires and frequency would give an indication of the speed. My reference is from variable speed inverter drive motors that are used in residential air conditioners and industrial motors. Of course you would check the inputs to the module first. I saw phase 2 and 3 labeled on diagram. Is phase 1 connected to ground? Thanks for the Videos

[@DallasAutoDiag]

You could do that also. I'm gonna wait for another opportunity to make another video on one that operates and use advanced tools to check it. Preferably in my shop. This video is intended to the DIYer. The third phase is not grounded. That is a grounded shield.

[@garrettmudge8555]

Is that part number the same for the 2021 Tahoe?

[@alialex118]

معدل ابو يزن

[@DallasAutoDiag]

مشكور ورده

[@kanth0ny1]

The blue and grey wire with the 2-3v ref What does it mean when I don’t have that voltage on either of those 2 wires

[@DallasAutoDiag]

what time on the video it is?

[@LJAL05]

After replacing the fuel module do I have to program it for it to start?

[@DallasAutoDiag]

No programming needed

[@servandomota6523]

Mismo código P129F y el vehículo arranca en algún momento y en otro no, se revisó las entradas y salidas del módulo en el momento y señal dentro del parámetro

[@MrBonnatw]

I have the same issue with my 21 suburban. Took dealership 2.5 days to diagnose

[@MrBonnatw]

Crazy to have this issue with 57k miles

[@ayazbhatti2990]

Hi sir I have gmc 2019. Same this code coming p129F. Sir replace fuel pump but problem sme some time vehicle stert some time not strt what I do sir plz ans me

[@medulahoehouseruler5108]

Same issue I am having on 2020

[@ayazbhatti2990]

@@medulahoehouseruler5108 fuel pump control medoul replace.

[@DuaneDonaldson]

CANH should be above 2.5V and CANL should be below 2.5V. The more information being passed on the CAN Network, the busier the packets, the more the average voltage will float away from the bias of 2.5V, cheers.

[@nasserbarwani165]

Hi i have this code U18A2:00 and my issue is fuel showing for 15 second and show empty i check fuel pump it's ok do i have to change module

[@DallasAutoDiag]

Needs furthur diag

[@alexanderkasyanov4946]

hi, i have the same code on my 2019 gmc. have you fixed your truck? what was it?

[@dirkdiggler6038]

I changed mine and it’s still throwing the same code, not sure what to do

[@DallasAutoDiag]

Did you do the check I did in the video?

[@theo777m777]

Dealer is telling me it needs to be programmed, are they just BSing me? 2021 suburban

[@DallasAutoDiag]

If it has the sign I referred to in the video then it does, if not then it doesn't

[@rrmech11]

Nice explanation

[@DallasAutoDiag]

Thank you Richard

[@dominictimperio7060]

Thank you

[@alagerabdrahman2938]

Thanks... Keep going

[@Max-j2r]

❤❤❤❤❤

[@DallasAutoDiag]

Thanks Mano

[@danman9017]

good info tks make good will no video tks

[@DallasAutoDiag]

You are welcome

[@abuhaideraa]

Very good

[@DallasAutoDiag]

Thanks

[@hakam6996]

أبو ريان أريد رقمك