Sometimes late at night I wake up and can’t sleep and the only thing I want in the whole world is to listen to you ramble through your diagnostic process I love the way you think out loud and you have so much knowledge it always catches me off guard -these little comments I can tell you think nothing of I think to myself you must be a hundred years old to know so many things and this feeling that some things are so right in the world and I can go back to sleep finally

Finally someone that uses common sense and knows how to use his scanner. You must be very busy as most dealer mechanics have no idea how to fix today’s vehicles…

Great video. You should be proud of yourself. You are very thorough and persistent for a young man. Few people, regardless of age, would have gone to the trouble to track down the shorts. Not only are you persistent but you must be on the bright side to understand all this. Congratulations.

Using those ringing tools can be a bit tricky at times, but they are extremely helpful. Got an analog one, which was used by telephone engineers to "ring through" a wire. So you can basically let a telephone ring when you connect both wires or just one wire and have an handset. The advantage is the extremely high sensitivity. You can trace a wire behind a wall etc when you switch the sending unit to high power and the receiver has a volume knob which let you easily adjust it while tracing and gives you a much better "feeling" for the distance to the wire.

What a great lesson in modern technology and PATIENCE. Headed off to the dealer on Monday for the same damned "Reduced Engine Power" BS. Over a year of intermittent limp mode in some of the worst locations. It's a bitch being handicapped, but, at least I can go to the dealer forearmed with a litlle very dangerous knowledge. Thanks for the lessons.

Pine Hollow A.D. you are awesome. I watched both videos the other night after having no luck troubleshooting my reduced engine power situation that came on my 2003 GMC Yukon. With your help diagnosis of this vehicle I was able to look through my lines attached to the source codes and found a broken wire. I replaced the line from the gas pedal to the control module with a part off a junkyard 2003 Escalade costing less than $3. The vehicle works perfect now. It instantly fixed my problem. I suggest watching both case study videos in their entirety. They are very helpful. My broken lines were not he same as the ones found in this video but I did find two line that had broken over time. Replaced one line and repaired another. Thanks Pine Hollow for saving my family time and money we don't have to spare. Thank you sir

THANK YOU SO MUCH. I spent 2 days and $100 trying to figure out what was wrong. Your video led me to the fix on my 2004 Chevy 2500HD 6.0L. I had changed the Knock Sensors and cleaned the intake and heads and when I put it back together I was getting the Reduced Engine Power message and P0120 & P2135. Watched countless KZfaq videos and read countless forums. It was watching you strip the wire loom back as far as you did when I found the break in the ground wire near the rear most fuel injector. When I disconnected the fuel injector while taking off the Intake Manifold the wire must have broke fully. The ground was completely broke and the brown wire was chaffed with the copper exposed. Spliced those wires and good to go. THANK YOU.

I thoroughly enjoyed your detailed explanation of your procedures while multi-tasking with several DTC's. Your presentation shows you're HIGHLY skilled in today's very complicated automotive electrical and electronic systems. You explain and relate very well of your knowledge without being condescending. Keep up the great work and my sincerest thanks!

lvan. You are becoming a National Treasure. You are to methodical for the majority of us (I include myself.) I've learned a ton of stuff from you - have kept my 2007 Lacross running by using your help. Thanks.

Excellent Video. My 04 GMC Sierra tripped the "Reduced Engine Power" whenever I hit washboard on our county gravel road. Traced it down to the female side on four of the eight bayonet pins to the TPS. Took each pin out and compressed the tab down to make better contact with the male pin. For a quick check just move the wiring around to the TPS while engine is running. Loose contacts will cause popping noise from TPS.

Radio Shack closing for us electronics guys here in the State College area was a death blow. That was the last place to buy anything electronic locally. There used to be University Electronics, Electronics Unlimited, T&R Electronics, Acorn Electronics plus a few other smaller repair shops where we could find resistors, caps, solder and small items. Now we have to travel or just order things we need. Great videos, hope we can meet someday I work at PSU in the electronics shop.

Nice fix!! The ect2000 seems to work pretty well. I use a sewing seam ripper to open wiring harnesses, it gives less of a chance of damaging wiring. Keep up the great work!

The exhaust from the catalyst chamber on your butane soldering iron works well for heating heat shrink. I have the older version of the same brand. Love that thing.

Continue doing this and one day you will be the owner of a big amd successful mechanical shop. Most shops fail to do analysis, which you do great. Congratulations!

The second one of your videos I've watched and be nice to have one of them snap-on boxes you got out of my price range that's the way the vehicle should be fixed not throwing parts but somebody got carried away with a knife that's for sure but but I enjoyed your videos keep up the good work thanks

I keep a stock of Raychem DR-25 shrink tubing in my garage for under hood repairs. Normal shrink tubing can dissolve when exposed to oil/fuel vapors. You can get Raychem DR-25 on Ebay.

Great troubleshooting video! It is amazing how much damage can be done to a harness with a knife by inexperienced hands . My only recommendation is when making a wire splice (in a harness) is to use Western Union style splice instead of attempting to flank soldering two wire ends. Sn64 or Sn62 solder is not strong mechanically. In most cases I use a small piece of a wire ( 3 to 4 inches) to allow sufficient length to strip insulation - forming two splices, soldering and heat shrinking repaired wire. Butt crimp and soldering wire ends after crimping is another option.

very good video , I really like your videos, you make everything look easy even I know you spend several hour with the hard problems, knowledge is the key and also get to know how to use your equipment, thank you for sharing

I’m here just to listen to the wild birds. Beautiful!

when I first saw you on the eric o show I just could not follow the two of you talking. you were just talking so fast and your two brains were meshed together so surfing I found your show and low and behold you talk slow and easy to follow. very enjoyable segments. so you got me back as a follower and i'm learning a lot. thanks

That cut on the harness is because of the intake manifold cover(the plastic cover that goes on top) 2014 and newer 2500hd trucks that kept the 6.0 have an issue where the cover rubs a hole on the pcv hard hose at the back of the driver’s side head letting dirt into the engine, i sent 5 company trucks in for new engines because of it

Awesome 2 part video. Electrical problems are always a scary thought because of the labor involved to fix the issue. I must say, you did a stellar job and are good at your craft. Keep up the great work, if I was in Texas you'd definitely be my mechanic.

I'm having a similar issue on a 2008 Chevy Malibu LTZ. I noticed a pattern that the car would go into reduced engine power mode almost every time there was a hard rain and the car wasn't in the garage during the rain. I changed the TAC sensor on the Throttle body....that seemed to work but the problem came back.....I'm betting after watching your video that something is wrong in the wiring, possibly a broken wire. Thanks for the video, very helpful.

Dude your insight and tech is freaking awesome,I have an 03 Silverado with these same problems..glad I watched this before I spent a ton on new parts.

Lol can’t tell you how many times I’ve poked my fingers with a test light. I know this video is old but you definitely need to look into a Ts100 soldering iron now. It’s super small open sourced temp controlled soldering iron that you can use with a battery or other portable source. Has tons of tips and custom firmware with cool features. It’s PERFECT for the kind of work we do.

What did they use to cut the zip ties a Bowie knife.?

Nice work Ivan. Yep, it looks like someone had a field day with that harness.

Dude you are one hell of a mechanic..

Hi moto, thank you for this up load, you saved me a lot of money.

hey I just wanted to say thank you very much for your time & video you put together god bless you man for real I fixed my 2003 Tahoe reduced engine power problem I keep watching your videos cause I'm learning alot thanks again keep up the good work

Excellent fix, keep up the good work. Thanks for sharing.

Nice repair Ivan. Three observations. (1)-heat gun , no Bic lighter stuff - Ha must have picked up a bad habit from SMA. (2 )- I was taught by GM when performing a factory wiring repair their must be a mechanical support to the wire prior to soldering- we used fine gauge bare copper wire wrapped around the area in a nice even coil then solder. (3) - that tape on the eng harness is not factory ,neither is the use of zip ties. That harness has been taken apart and the retaining clips that held it down are missing and as you noticed they substituted with zip ties. In my experience the TCM does set if there are TB faults, last one I looked at was a 2006 Tahoe late second shift , TP- coloration code- new TB , all fixed. I do like Matts tool , seems a little off at times but I guess your going to make a demo vid explaining how it works:) I really like your presentation and awesome repair thought process. Thanks for showing us. 👍

Awesome job explaining as you go. Thanks for the content. I'm trouble shooting a rough idle lack of throttle response in power right now in 5.3 Yukon xl.

I always love watching your videos!!!!!

The check engine light won't come on on a TCM code what you need to do is leave the key in don't start it just click it over twice to where it's on depressed the accelerator for 2 minutes release accelerator and turn the key off and let it sit for a couple minutes and let it reset that's for the transmission control module JohnQ by the way great video I'm an electric lift truck mechanic so I'm pretty knowledgeable on this but your video really helped me out so thanks a lot

i think you missed a step. the unplug test to see pull up or pull down on senso signal. great video and good tracking.

that tool to hold the wires is going to be my new lifesaver.

You should replace the whole section of wiring that had been probed due to the insulation of the wiring being opened. If the wire is not sealed after being probed it will lead to corrosion and the wire breaking in two from said corrosion.

I almost think a 4 hour trip to State College is worth it! Currently experiencing the same issue in my 2011 Chevy Impala with either something in the throttle body or the APP sensor.

Finally a great video of a Vortec 8100!!👍 I own a few and I've had this problem with one of them and right now I'm having an issue with my daily driver. It's a 2002 GMC Sierra 3500 4wd 8.1/Allison with manual shifter on the floor for 4wd(Basically same model as this one in your video). While driving, it will turn off and back fire a few times and I pull over and turn the ignotion off for a few seconds and it will start back up like nothing happened. The "Service Engine" light comes on whenever it feels like it and its really wierd but this happens more when I hit big pot holes or when Im towing a trailer and trailer jerks truck alot. My Message Center sometimes give me the "Trans Fluid Hot..Idle Engine" and Transmission temp is at 300°F . Normally it gives that message every time I start the truck and if I drive off like that, it will shift hard & long thru out all the gears. Then whenever it feels like it, the trans temp guage drops down like if it got unplugged and the truck will shift perfectly fine. I still drive the truck everyday and she never lets me down. I just really haven't found someone who can acually find the problems and and fix it properly without damaging anything else on it😏 I dont know where you are located but if I can get in contact with you, I would not mind at all taking it to you myself and having you work on it. Well I can go on forever but my contact number is 210-216-1785 (Galdino Rodriguez)and if its ok with you, you can call or txt me so I can talk to you about it or get with you about taking it to you. Thanks again for a great video and stay safe my friend!👍

Thanks a million, does that scanner tools do reprogram for ECU PCM if needed like when installing a new throttle body

hey i dont know if you have any milwaukee tools...but i made a cool protable soldering iron using a milwuakee battery to power it...works amazing...heats up in a second...i always use flux just for better penetration...great freaking diagnostics...im dealing with this exact issue right now on a 2007 2500HD...thank you so much for the video...we are close by..im in pittsburgh..

Nice repairs! I have a theory for that wire damage, those trucks were plagued by intake gasket leaks and many of them were replaced by the dealers under a recall/class action, stuff like this would happen during those repairs - ask me how I know this lol I am a fan of Schrodingers box as well, I am torn between the scan tool he uses, and you verus cause I need to invest in one, that open/short finder looks sweet - great content in your video’s

Felicitaciones, nuevamente un buen trabajo.

Great video out of houndreds of videos this ones helped the most. Thanks

Great job Ivan Part 1 and Part 2.

Likely someone did some major work on this engine, or maybe even swapped the engine out and at that time they cut the ties to remove the harness, using a sharp knife of some sort. Pulling engines and so forth is work often performed by the lowest experienced guy in the shop and if this guess is correct, that is how the harness got cup up in multiple places. Thanks for a very good diagnostic "study" as you call them. You are a regular Sherlock Holmes.

Nice solder job and holding tool demo. Use your solder tool heat from red hot area to shrink shrink tubing. I think the cutting the zip ties is correct assumption

I have the very same problem on my chevy tahoe. so I need to go an check all the wiring and hardness thanks a lot

Amazing job. Very well done!

No wonder why I I I I I didn’t have ground your the boss men thanks a lot I been working on my car for at least 4 months Tmrw I’ll get it done ❤

That ect2000 is an awesome tool. I have to get me one!

i saw a good idea for this on briansmobile channel he uses a tone generator to check a break in an individual wire. where the probe u r using will check all the wires in the harness inductively.

Nice Work Ivan!!

I'm having the same problem, but the grounds seem fine. but bank 1 is reading 1.14 but bank 2 is reading .98. is it safe to say its the sensor?

Wish you were located near me. I could use your services. Great video, It seems some guys have the tools but, just don't know exactly how to use them.

Nice Find! Cool Tools.....

Great work, really enjoyed it.

Good stuff guy . Thanks for your time .

Great video!!! did the P0 802 code ever set again? if so what was causing it?

Wow, the early Ivan days 😯 When everything goes wrong and he still won't quit 🤣🤣

Top notch work!

Excellent Ivan !

My Son has a 2003 Saturn L200 that has the similar issue. There's no power when you floor it and has a "Engine Jump" (miss) when tapping the gas in park. I've read of GM vehicles having issues with the TB. Could be a bad circuit inside the TB innerd's too. From what I've seen here that it could be a plugged cat as well, which I find remote. The check engine light flashes when it does this but no codes.

Does anybody can explain me what was the problem I replaced the throttle body, pedal sensor and maf sensor and still shows up engine power reduced 🆘 please !!!

I'll admit, I just change parts until I have to take it to a mechanic, but when a "pro" is so sloppy that they cut stuff all willy nilly, that really makes me wonder wtf? I've had guys drop bolts in my engine while doing a tune up, etc. You really need to know who you are taking your car or you will be screwed. At least it is fixed and he can go back to work making a living, good job sir!

very good those guys that worked on it before are Butchers for sure. your the man Ivan .

great work, thanks for sharing

Sir once ect is connected to the battery by default the light goes to the open,then how can we find there is a break in wire,will there be a beep sound

Great job very informative

I have one of them short and open wire tracers I got from harbor freight years ago works well

I learned to be wary of Mickey mouse jobs but that harness might actually have been a mouse job haha

Do tpu think this could be done with a field piece meter 270p

Good Case Study Ivan Just Wondering did P0802 comeback ? Fixed? Todd ,Best Auto Service , Bakersfield,CA

Great info on my 03 Tahoe replaced pcm throttle body wiring harness all the sensors and still reduced engine power im lost.

i m looking for tahoe 2009 Manuel? where i can find it

You could use a small block of wood just behind the wire and probe with your test light so you don't stab your finger when probing.

awesome video, thank you very much, keep it up.

nice job on that repair

Looks like the 2 copper ends wires were not twisted around each other? A good solder joint needs a solid mechanical connection, and the solder is to make a good electrical connection. I've had practice due to rodents chewing thru wires, chewing off insulation.

You of course will tell the Customer that you fixed his tps issue only, other codes comes back is a separate charges.... there is no stop for all fixes in the vehicle.

You're amazing. Absolutely amazing.🤩

I can't get over on how HUGE that engine is.. It's bigger then my dad's 70' Buick GSX engine at 455ci (7.5L)! Heck it's 100 cc larger then the Bugatti's W16 engine!!

Dude, I'm so impressed. you truly have a gift. (Snap on scanner just helps refine it). Just curious...how much was the scanner?

Very nice work! THX

Hey how you doing, very good video, I have a Chevy trail blazer LTZ 2002 and I have a reduced engine power lights on when the engine is cold and i already changed the Throttle body and I still have the problem I don't know any electrical person that I can trust to fix my car seeing this video I would like you to fix my car (I live in Miami) thank you so much

as eric says " there's your problem lady " !! :-)

First check for exhaust coming out the tailpipe to eliminate clogged exhaust.

That Radio Shack butane is a rebadged “IsoTip”

Thanks Ivan...

Great video

What camera and video editing software are you using?

Moto, by checking with the test light that way connect to the positive battery terminal, you are check for a short. Remember this circuit is open.

Whatever happen to this truck and I'm having the same issue can someone please help

what is the part number and make of that piercing tool? where did you get it? (yellow and black) use with your test light

Nice find, there. Cut wires in the harness!! S.M.H. I love to watch these types of vids. Like sma etcg that scanner dude. It's like watching an episode of HOUSE. Trying to diagnos the problem, throughout the whole show!! Hahaha. I guessed a cut wire in the harness, just as the video started! NOT! I would still be scratching my head. Good job.

I would use a smaller diameter solder than what you have, it will help the solder flow with less heat. Just don't go with the lead free solder if you can it requires much more heat and is more prone to breaking with vibration.

Try solder sleeves. You will love them . I buy 100 assorted on eBay for $12 to $15 bucks.

When my 04 suburban did this it was a battery issue the cables weren't tight and I charged my battery

GREAT JOB...