Trouble codes are NOT part numbers! This is why - 2019 GMC Sierra

[@robertlang9359]

I have this same catch phrase on our board at work. To many guys guessed a vent valve and were wrong. Thx for the video.

[@RobLaing-i2r]

like your comment regards robert laing south africa

[@djosbun]

Professor Marios’s teaching skills keep rising to a new level of greatness!

[@matolittleelkwells5377]

Always great to see proper diagnostic and troubleshooting done and not just the quick fix subscribed I'm an automotive technician as well

[@dmc6419]

well done, felt like I was in tech class with a good teacher. great demo and explanation. thanks!

[@Joe-ud2hb]

My first time on here, So methodical, explains clearly, speaks clearly & uses the camera perfectly 👌& knows his s..t!

[@timothycooney986]

This young man should teach at a technical college. Very smart guy.

[@thevictim2072]

That is what he does at KZbin University.

[@distinctridesbydavy]

I agree 👍💯

[@bartscave]

Absolutely. A very detailed, patient description of the diagnosis

[@JeffinTD]

Totally agree. In this day it takes a lot of intelligence, knowledge and problem solving to be an excellent mechanic.

[@ThePracticalMechanic]

Great video Mario. Only other thing I would have added is to verify the vent valve resistance is correct in case it is pulling too much current and caused the damage to the FPDM. Corrosion is the most common cause but still worth checking the load amount. I’m tired of these parts being unobtainable as well. Imports older than 1995 are getting hard to find parts for and domestics vehicles newer than 2010 are hard to get parts for. We are waiting for TCMs, Ecoboost VCT gears, blower motors, wiper motors, tundra fuel pumps and the list goes on.

[@alinduta5398]

what is better to measure? resistance or inductance because is a coil

[@ThePracticalMechanic]

@@alinduta5398 the manual won’t give specifications for inductance but will give specification for resistance. Most vent valves are 20-40 ohms from what I’ve encountered.

[@DmitriyL_Arithmechanics]

Here is an entertaining scenario: what if the vent solenoid is partially shorted -- still works, but consumes, say, 1.5A instead of 0.5A. And the driver in the FPCM is over-current protected at 1A, turning off the load quickly and trying again shortly after. This would get the solenoid not working, and the 4A light bulb dimly lit, even though nothing is wrong with the FPCM driver in this scenario. Not saying that happened in your case, but something to be aware of as more and more circuits in modern cars receive over-current protection.

[@theisabelfamily4372]

What test would recommend to determine that?

[@Mr2004MCSS]

Great video. It also pushes home the reason why I still drive my 1998 Chevrolet K1500 and 1998 K3500 trucks. Not being able to get a module for a four year old vehicle is nuts.

[@Swatson0218]

Nice video. I work at a GM dealer and we replace these things all the time most of the time we get a p0449, p0498 and p0499. No programming required. 👍🏼👍🏼

[@scientist100]

good good, does that mean that the parts are backordered for that reason and the dealer gets exclusive access and customers get shafted with longer backorders?

[@Swatson0218]

@@scientist100 Nope we wait months sometimes at the dealer as well

[@Swatson0218]

The fppm is covered under emissions warranty.

[@Swatson0218]

Which is 8/80 on most vehicles that would have this issue

[@gregjones8501]

Very clear and logical approach here! The experience speaks for itself. Thanks for this video Mario!

[@djwwautodiagnostics]

Without even watching the video, I absolutely love this title and it's so true 😄😄😄😄👍

[@cullenmiller8170]

Nice video and step by step diagnosis. Different test lights, banana plugs and the AES Wave kit are an absolute must have.

[@labrat6910]

Super Mario and Paul Danner are awesome.Always looking foreward to see your guys content.Thanx bro!

[@mikechiodetti4482]

Your 100% correct. Your testing is correct and spot on. Good one Mario!

[@Bowhunter2500HD]

I bet all the hope and change parts changers just learned a great lesson. Young man you need to teach classes. Awesome lesson

[@mechanicsdiary1438]

40 years in automotive . I work on euro cars in USA . Love your content . Nice that you share your knowledge. Top notch.

[@eacherenkeka]

Excellent video Mario! Very well explain and a lot to learn from two wires component! Always waiting for your videos! Thank you, Mario!

[@erikkirby1]

FPCM up here in Canada are also on worldwide back order with no eta...

[@luismartinez1824]

Great video. Very simple diagnostic and trouble shooting explained.

[@biglevstergarage]

Hell yeah Mario, thanks for the extra tips. Loved that idea. Good work as always.

[@kyletuttle9064]

Great testing video thanks for sharing Mario.

[@wolfgangbeginners-mind2853]

I can't believe that GM dose not have such an important part available on a 4 year old truck.

[@godofthunder6613]

Sadly most flat rate techs won't bother to properly diagnose this correctly the first time, instead they'll sell the vent solenoid, flag the the diag and install time and then when that doesn't fix the problem they request additional electrical diag time. The worst part is that most of the techs who do this are praised for flagging so many hours and making the shop lost of money by upper management

[@howardboyd7764]

Yeah..... And why would they bother or GAF when they aren't being properly compensated for their expertise to begin with.....

[@ThunderbirdRocket]

@@howardboyd7764For the customer’s sake / bill . It’s the right thing to do . The mechanic can enjoy the inner rewards such a self respect / peace of mind .

[@mac1mike]

100% understood And I like your modest demeanor You don’t explain it like a know it all

[@jonathansirimarco6215]

Gracias por aportar tus conocimientos y en la industria automotriz. Saludos desde Argentina 🇦🇷

[@cannbudo]

No better way to do it. Thanks for the video.

[@jameslewis1175]

Great video man. Very simple explanations and thorough data

[@alexakahonda]

Man keep these videos coming. Great work

[@8power0]

ITS JUST KNOWING YOUR SYSTEMS ,,,,,,,,,, AND TAKING THE TIME TO DO THE TESTING . THANK YOU MARIO,,,, I REALLY LIKED THIS VIDEO I ONLY WISH THERE WERE MORE STRAIGHT FORWARD VIDEOS LIKE THIS IT HELPS WITH REMEMBERING THESE TESTS PROCESS LATER ON DOWN THE ROAD .!!!!!!!!!

[@Lambros_Stefaneas]

very good video. I am wondering, for European cars, what you prefer to use,alldata, Haynes, or Autodata ?wich one you think is better?

[@jgeorges3061]

Mario, Awesome Approach and thought process thanks for sharing as always.cheeeeeers

[@jasonwillen4468]

Wish my boss would watch these kind of videos. He likes to throw parts at cars instead of diagnosing them first. 😂

[@Swatson0218]

I would definitely try and find another shop to work for.

[@mrblonde2013]

Same here...😢😢😢

[@jamesrahn8339]

This is a kick ass video that is clear and very well explained. Thanks for this video! Oh what was that 2 wire lead that you used to bridge those connector pins?

[@jenniferfreeman1752]

I have a 2019 GMC DENALI WITH 6.2 the vent value is what made my fuel pump control module go bad.

[@TheRealTailGateTech]

Another A+ teaching video.

[@jordysandino6577]

Bonito video primo aprendí mucho de usted hoy . Adelante con sus videos . Soy sù seguidor #1

[@dp1mat33]

Another great instructional video.

[@brakeboss]

Awesome video and explanation buddy. Thanks for sharing.

[@gilbertomoran7420]

Good job, Mario . I've had some of these before . I usually check power and ground to module (at module connector ) . I noticed you skip checking the power(12v) to the module . I'm afraid to skip that step. But from I gather in this video , is that If you have communication to module , no other codes , and command . Then there is to need to test 12v feed to module. I would only test ground supply to module . Correct ?

[@SuperMarioDiagnostics]

Correct. Especially since the fuel pump is driven from the driver module, which is at least 6 amps in load. Technically i didn’t have to check the ground to the driver module either. But figured it was an easy enough step to take so i did it anyway

[@gilbertomoran7420]

@@SuperMarioDiagnostics thanks for the info . Keep it up brother.

[@alrifainidal]

What the awesome troubleshooting, I wish for you the best pleas keep the video rolling.

[@ThunderbirdRocket]

Extraordinary detail ! Super helpful !! I learned lots !!! Much appreciated 👊🏼 .

[@Stormin06096]

Unfortunately a large amount of techs would have replaced the vent valve because "they are always bad", and sent the vehicle on it's way. Load replacement is a great way to actively test the circuit. Too many techs only use voltage and never consider current flow. I would guess if a tech had used a voltmeter instead of a lamp they might have seen power and ground and left it at that.

[@RobertJohnson-kv6dr]

Can I just clear up some confusion in my mind, not yours 😂 you said the FPCU had a permanent 12v and was earth switched by control unit, then you used your 4amp load between the white wire which went from the control module to vent valve and a chassis earth, I take it you used the earth from chassis to load the earth to vent valve but how did you know that the chassis earth was good? Brilliant video, love your explanations

[@jimpetty2961]

great video excellent teachings

[@clampingdiode]

Love the title of your video. Nice job.

[@distinctridesbydavy]

Great video 👍

[@DavidRomanKC]

Awesome title.

[@kenfromsilverdale5675]

I would've checked the resistance of the vent valve to be sure that's not what damaged the module to start with as applying direct power and ground to the valve to test it is not fully testing it, it's only testing the mechanical operation of the valve.

[@SuperMarioDiagnostics]

It’s also ruling out anything outside of the module. Not just testing valve operation

[@jacqds88]

Minimo. Masther. Thank you. For your video for me is a class in it. You have to to teaching in a college. Please. But here in California. Ok. Also a quick question. Where I can buy a tools that you show there the lamp and the connector. Please. And once again thank you 🙏. Gracias Siempre

[@keeblertime1486]

I don't even have to watch it. I agree with the title.

[@qusaykambal6903]

I have some issue in Toyota rav4 2020 (engine coolant bypass valve solenoid2) code (P2681) the full vedio in my channel the problem is highe resistance and caused by the pin in connector of pcm not connecting properly .. good work super mario

[@Joetechlincolns]

Let me guess, Fuel pump control module? I've done several on Malibu's.

[@Joetechlincolns]

I was told by a gm tech that fuel tank vapor pressure faults will set same vent ckt code also. Reminds me of Ford setting P0340 cam ckt fault and engine mechanical timing is cause, as an occasional example.

[@tracydiller9378]

Great video Mario, you have a new Subscriber.

[@jonny8813]

I'd like to make a load tester like that, where can I get the parts needed besides the pig tail?

[@marlinyoung1606]

Wouldn’t it be smart to replace the vent valve too or no?

[@alexlee4573]

Great video. Thank you Mario!

[@ramonacevedobravo4398]

Tnx 4 the video!!! That was good testing good job 👍

[@philh9238]

What do you mean by using a diode to test an injector??

[@SuperMarioDiagnostics]

Noid*

[@eddiereichel9354]

Noid lights are LED. LED = Light Emitting Diode.

[@jeff7.629]

Mario, if the ground for the fuel pump module was weak or bad, wouldn't there be an issue with the fuel pump operation?

[@SuperMarioDiagnostics]

Correct, I technically didn’t have to check the fuel pump ground. It was easy enough to do so I did

[@noeygarza64]

Awesome video

[@FORDTECH313]

Hey Mario what scan tool is that your using

[@SuperMarioDiagnostics]

Topdon Phoenix Max

[@shaffere33]

Great diag Mario!!

[@Fix_it_right]

What is the difference in using a 2amp test light and a 5amp test light when it comes to testing? Thanks

[@richardnilsen5]

When testing the component that the computer is commanding it doesn't matter because it's unplugged and while testing the the component measure how many amps it draws so when you test the harness side that goes to the computer you will know how many amps the component uses to operate you don't want to put to many amps in a low amp circuit you will fry the moduel know how many amps the circuit uses to control the component then select the right test light 👍

[@ahmedalhimaidi9804]

How good that scanner do you like it better than autel ultra

[@gerardopesina3489]

Does it need to be programmed ????

[@alexandrumardare828]

What if the control unit applies a low pwm and that is why your light is very dimmed?

[@SuperMarioDiagnostics]

It doesn’t. It’s a non modulated output signal. Finally got a new module and it’s all fixed. Was on back order for a very long time

[@jaseralomary8854]

Many thanks...very useful video

[@aymenmohamed1134]

Awesome

[@mrblonde2013]

I had to watch this 2x to get my head wrapped around this, and i think i get it now. You would still check for correct B+ to the module, correct? Thank you.

[@SuperMarioDiagnostics]

The vehicle wouldn’t run without power

[@mrblonde2013]

That makes sense, shows how much I know😂😂😂thank you.

[@johnnyramirez9082]

Bad ass bro

[@SS-U23]

👍👍

[@7minnow]

Sweet job!!!

[@keltecshooter]

For giggles i checked Rock Auto, they only had 1 in stock and it was a standard, not a GM part ! And what is going on when a 2019 fpcm is failing ? Crazy

[@goodtimejohnny8972]

Amen!

[@GerardoVw1]

That may have emissions coverage 7-70 federal

[@IamReadyToRock]

Nice👍🏾👍🏾👍🏾

[@orinmangar2333]

It's nuts to be buying a GM vehicle where the module goes bad all the time. Good business for the dealer and mechanics, bad for the customer/owner. Do I need to say anymore?

[@davidborgesen5851]

You should have put a voltage meter in the valve plug to demonstrate that a voltage meter can show 12v even though it it is faulty.

[@thesmartguy3523]

Yes agreed

[@SuperMarioDiagnostics]

That wouldn’t give us any more information than what we already know. The headlamp had a command, but would not fully illuminate, unloading the circuit and commanding it andand seeing 12v would only tell us that there is voltage drop. Seeing anything between .1-12v would tell us there’s voltage drop. It truly doesn’t give us any more information

[@ThunderbirdRocket]

@@SuperMarioDiagnostics Thanks for taking the time to answer some of the questions ! It helps our understanding significantly ! I hope you have a wonderful evening Mario !!

[@nicknicu1787]

What about the guys that came on here for that silver bullet and you royally screwed them in the beginning by telling them to replace the vent valve?? 🤣

[@vincentdamus8053]

Bro is love you great video!!!

[@aircates]

Judging by the size of the paw prints, I would say a rat.

[@richardcranium5839]

there's something wrong alright. the underside of that vehicle is waaaay too clean not rusty enough.

[@RobLaing-i2r]

should it not be a warranty job?

[@richardcranium5839]

@@RobLaing-i2r the 2024's are out so its hard to say.

[@DS-ss396]

The movement of the truck on the lift is unnerving.

[@munthirkhan1217]

The real question is why a 4 year old rust free car needs to have modules replaced already?

[@mariod852]

❤