2007 Volkswagen Jetta 2.5L- Crank-No Start, ECM No Communication

NOTE: its not a fuse!!!! lol, working on a 2007 vw jetta with a 2.5l engine, customer complaint is that the veh will not start, the veh does crank, no engine light with the key on, cooling fans are on high, these are signs of an ecm that is not communicating, found that there is no communication with ecm using the scan tool and all the other modules have a networking fault ecm no comm stored, I hope you enjoy this video and thanks for watching.

[@SmokinMayhem1]

Thanks brother did this to a Jetta today that has been parked for almost 3 years and seen by many mechanics and no one could figure it out damn thing just got back on road today thank a million times brother

[@philh9238]

why is it always more interesting seeing someone else diagnose vehices?? but thats what i do through out the week and its not as interesting haha

[@mikemurphy2]

Thank you! Thank you! Thank you! You saved me from totaling out my daughter's car. I'm so happy after watching your video. After going through the car top to bottom I followed your video step by step with limited amount of electrical testing tools. I tested 1,2,3,5,21,62. 62 - the red/black wire had only 3 volts running through it and as I moved the loom around it shut off completely. My wiring loom was untouched. I started cutting it back, the wires looked perfectly clean but about a foot away you could tell the wires had been getting wet and there was dirt mixed in. Then a saw an area of green corrosion that led me to the point that the wire was broken. I didn't actually see a break in the wire but it was definitely corroded inside the wire coating.

[@PositiveLeadDiagnostics]

Not sure why, but that wire always corrodes.

[@troysmith9453]

Have been watching you for awhile and I know ever time Paul danner watches one of your videos he sheds a tear of the monster he has created THE FORCE IS STONG WITH YOU

[@baxrok2.]

Very cool diagnosis and fix Tom. The can signals were indeed slightly different but very much like the ones you and Paul showed us recently with the "mis-located" fuse. Enjoyed watching you work. Thanks for sharing this!

[@fraanz330i]

Thanks man. exact same problem on an 08 vw jetta 2.5L...sat for two years...we had replaced fuel pump...done tons of fuse and relay checking, never thought to check wiring harness. original wrap, same wire as in the video corroded to the point i pulled it apart from itself. Appreciate the great tutorial!

[@HeyBirt]

I am always suspicious when I see electrical tape. It typically means someone has been hacking into wires, usually cutting them an inch from a connector just to make them hard to repair properly. Good job on the diagnoses!

[@JosePerez1973]

That was an awesome video, Nicely done. Wish all mechanics were as thorough as you.

[@mania002]

Nice diagnosis, you saved the customer a lot of money.

[@deplorable_pureblood_patri7704]

I picked up an 07 Jetta yesterday for $200 with the same issues shown here. The dealer quoted the owner $2200 to replace the ECM. I tested it the way that you’ve shown here and had a short on the same wire. I fixed the short and the car started right up. Thank you for this video.

[@orville58]

I really enjoy your thought process throughout a problem thanks for taking the time to explain and for posting

[@Anejo61]

Nicely done. Much reward in fixing that which many cannot. Simple process and NO, I would not have started with the canbus. You followed the simple logical process. Nice to see a younger pro doing things the right way.

[@awudubannaf8608]

You are very knowledgeable..... What makes me excited is how you use your tools absolutely awesome

[@freddy2064]

Very nice map to success. Thanks for taking us along.

[@darrenflounders2803]

It's nice to see it not always so technical,,,keep up the good work👍👍👍

[@sethwright]

wow, I am seriously so impressed with this video. You taught me so much just in 15 mins!!

[@Isabellabronx70s]

Like this one. This guy was like a detective on these numbered wires. Most shops I've been to don't even take that time to read a diagram.

[@eladio4365]

Hi again Tom you are a genious ! I had same simptoms no check engine light and fans had a mind of their own cause they would turn on for no reason so i did everything just like you have it here documented in your video and guess what it was same wire Red + black and i used my test list and traced it and there it was with same white rust inside wire cut it and jumped wire and boom turned on right away ..was very happy when i saw check engine light on cause then i knew i was in the right path !!Again tnx a million i wish you were near by to treat you to some Chinese food or some Ribs but i guess we far away from each other ...mike tnx bro you are a life saver !!!take care pal....Eladio

[@gearhead-bv7kv]

Dude u saved me many many hours of searching. Same exact problem. Fix the wire now it runs. Thanks a million buddy

[@stevenelson6639]

Which wire was it? He talked about number 62 being red and black early in the video, but looks like he is fixing a black and yellow wire

[@MugenRicer]

Great video. Had in the shop a 2007 Jetta also pin 62 only had 2.2 volts pulled the wires....black and red had corrosion in it. Repaired the wire cleared the modules and all is good. Thanks again.

[@jbb5470]

Great video! Really liked watching you hunt this down. Thanks for posting

[@prmayner]

Distorted can signals will be my go to from now on with a no comm, great vid.

[@PositiveLeadDiagnostics]

nice, I think its a great test!!

[@jemmace2586]

Great job! Very satisfying to watch a pro go through such a problem with seemingly no starting point for us diyer's. Subscribed... Thanks!

[@la1negrita]

What a wonderful story with a happy ending. 👏🏽Bravo

[@lildoggy4u]

Can I just mention how watching you work with that wiring reaching all the way back to the firewall made my lower back hurt.

[@billyr9840]

Tommy, Paul taught you well. and apparently you paid attention !

[@EXOVCDS]

Nicely done!

[@LemmeTryFixIt]

Awesome vid. I had a car dropped off today with the exact same symptoms. No comms with the ecu. Fans running, won't start. This video will be helpful with troubleshooting. I have All Data, but your video provided what pins I need to check. Much appreciated, and happy Thanksgiving.

[@natanV798]

Even this video has 5 yrs, my jetta does the same thing! Thanks for the solution

[@train4905]

Tom another abdolutely brilliant video. Very clear concise,methodical. Superb job.steve from the uk

[@jgeorges3061]

Good one TOMY, always fun to watch and listen to ur process . thanks for sharing cheeeeeeeeeers.

[@lukefolger8480]

Thank you for the amazing video! Followed this process and found the same corroded wire!

[@OscarHernandezMOhm]

excellent video!!! you help me a lot to fix my car!! congrats!!

[@SeniorBunnies]

You are genius, and it's helped me to solve my problem. Thank you

[@carlovincetti1352]

You may not even of had a short in the wiring but that is what it is supposed to do, lead you to thinking that will find it.

[@woody95124]

Very interesting!...Good job on locating ACTUAL problem....

[@PositiveLeadDiagnostics]

Thank you. This actually is a common problem on the mk5s

[@eladio4365]

Excelent job bro ! I have same problem now i know what i have to do ...tnx a million Tom.......

[@sandyande]

thanks Tommy, great learning video cheers sandy

[@nadineoubida2127]

Pretty crafty. Outstanding diagnostic. VW are notorious for thses broken/ rotten wires and water infiltration, damage.

[@96ej]

1000th like lol, thanks man I owe you one I'm 99% sure this is exactly what's going on with the car I just got

[@hajileserpud9539]

Is it same problem or different ?... my daughter has a 2008 that's acting up

[@Onelovelife8]

I also think this is what's going on with my vehicle as well

[@richardmcwhirter9396]

Great work once again thanks for sharing 👍

[@stevethedonful]

Nice fault finding man.. I’m about to start on a 2009 Tiguan.. no start, no comms..!

[@tntt8567]

Just got one towed in as soon as I turned the key and got the scanner ready and those fans kicked on I knew I had a problem with the pcm so the carpet was wet I just moved the rubber seal under the hood as sure enough it was full of dirt water and the fibers from the fire wall so a mouse house and broken wires repaired that and everything worked 👍

[@AutoFocus-se]

Good job. VW wiring diagrams is fun to track :D

[@THREESHOTBANDIT]

Well done Tommy!

[@Marour.5]

I suggest doing a capacitive discharge of the car battery before changing out parts. Disconnect both battery terminals, starting with the ground - (negative), connect both connection leads with a jumper wire for at 1 minute. Reconnect both battery terminals, hopefully that helps. That worked with my car!

[@buddiec]

Dude that was awsome great trouble shooting skills

[@imanuelkasheeta8820]

U are a professional my 2008 Audi A3 2.0 T is also doing the same I hve also removing my wires frm ecm plugs but jst dd it halfway

[@baks6890]

That was perfect and very instructive 👏👏👍

[@ojong20521]

Great video. Thanks for your 21:41 minutes of interesting VW realities. Got to love the internet and Mr. Tom!!29Aug18

[@StevenPatrick]

awesome video man .. you know your stuff .. very impressive

[@adishajrovic2082]

You are the future Scanner Danner !!

[@email2201]

that was awesome and satisfying... good job..

[@CarDocQatar]

i clicked on your video thinking its scannerdanner just because of that yellow dmm :D

[@Pablo_Automotive]

Thanks Tonm for share ☺

[@lweeeluay]

thanks thanks thanks you are a life saver , same exact problem and same exact wire .

[@familygunsandrides....8024]

Great video, I'm having the same problem with my 2004 Audi A4 now I know what else to check...

[@jesusjessereyes6633]

Well done man!

[@timbrown6593]

Wow i have the same issue and now i can reference your video to the mechanic

[@JustGrowSG]

As someone who knows zero about cars I learned a great deal about my Volkswagen. I’m hoping it doesn’t cost too much to replace this thing.

[@Jeremya74]

Replace what thing?..your VW?...that depends on what you get to replace it..duh

[@JustGrowSG]

@@Jeremya74 have a nice day

[@Jeremya74]

@@JustGrowSG wait?...that is what you were saying?..I thought I was misunderstanding..😂

[@vian303030]

Awesome thanks for sharing.

[@LUISATMOVIS]

you are the man thank you

[@gustavomartinez324]

Wow bro u truly the VW expert

[@unlimited408mike]

Great video very good job 👏

[@sara78130]

good vido tomorrow i will check again for pin 3+ 1and2 - 21+ and 62+ thanks

[@bundylovess]

Nice job mate

[@rrmech11]

nice job tommy

[@mustafaafridi1558]

very nice job

[@whitetiger8652]

Nice job!

[@serpentbearer6649]

Man u would be a good friend to have

[@rsharney1111]

I have an 08 Wolfsburg that shut off during a snow storm. A few other mechanics did a few tune up things and now it has a misfire from hell and about 30 codes (all low voltage or implausible values) found an aftermarket alarm/ amplifier cluster F that had shorted and took out the ecm fuse also killed the lift pump and burned up the hpfp, a air temp sensor wires were dead shorted, and the 12v feed to a module under the steering wheel was shorted. After removal and repairs it still has a ton of codes and misfires. I think I have a hidden short or the ECM is cooked. Idk but I've tested every relay fuse and connector to do with the motor and they are good.

[@bilalflayeh6889]

Great job

[@fredflintstone8048]

Great job.

[@JJ-kw8fo]

Excellent Job!

[@carlovincetti1352]

Yes, the dreaded "somebody was here" Least it lets you know you're close to finding it:) Then there are all the mechanics that can't find these problems.

[@chadgardee1496]

Positive lead ftw👍

[@fieldsofomagh]

The moral of the video-----it pays to check the power and ground______good methodical fault diagnosis.

[@jamesrossmotors]

Nice video Tommy. I am curious to know if this CAN signal distortion is a VW only issue when a power supply is lost or whether or not it is the same for other manufacturers. In your other video with Danner you went back and questioned the resistance of the TCM CAN lines and was curious. This led you to look further. I am not sure that an issue inside the module would pull the reading up or down since the TCM did not have one of the 120 resistors inside itthat returns the 60K value. I think your logic to question replacing the TCM was good but am still not sure that even if the TCM was at fault that you would have seen a different value as the testing is all done powered down and all these lines carry are messages. Still a great catch none the less. Maybe we will have to wait until a faulty module is found and check the CAN resistance then to know for sure what goes on. Thanks for the video

[@williamsautomotiveb3906]

Good stuff, where did you tap into for CAN signals? What pins?

[@jgizin]

Awesome job. Is the connector that was right next to the damaged wire the factory "(D78) plus connection 1" or splice in the wiring harness that was seen in the wiring diagram? I am trying to sort out an identical problem. I have no power at the T121/62 0.5 ro/sw wire.

[@dezblyan5125]

Good job finding that wire, most wudda changed the ECM

[@lildoggy4u]

That's exactly what most shops would tell you they'd have to do

[@uttarabia1]

good video

[@kellyspeppers]

Have found evidence of the wiper motor arms coming in contact with that wire bundle connection the ECM on a 2005. Also found evidence of moisture inside the ECM. On this car I found the drain holes were stopped up by leaves in the area under the ECM that caused snow and water to cover the ECM wires. Could be the reason VW changed the ECM location on the MK6 cars.

[@jdmcarboy64]

This is the same issue I’m having on my mk4 Jetta 2.0L I went to change the plugs, realized I didn’t wanna tank the leafs from the wire so without the tool I never even tried. Hooked all my vacuum lines back up correctly and it just turned over and over and eventually killed the starter. Still don’t know if it’ll start once the starter is replaced.

[@kennethmckee4223]

Great diagnosis simple straight to the point.

[@softwareengineer9217]

good job!! scanner Danner JR

[@raymilligan9556]

that green corrosion will get you every time!

[@z.b6506]

U a best !!!!!!!!!

[@TheModScientist]

great video! I have a problem with an '07 jetta 2.5. has me pretty stumped. throwing codes for AAT (IAT) sensor high voltage, and ECT high voltage. Ref voltage is good, sensors both read fine. Seems to only set the codes on start up. Car runs great and I can clear codes while running and they never come back, can shut off after clear and key back on and no codes. Only set when car starts up. Any ideas where to go next?

[@lildoggy4u]

Very impressive. where would the ground wire be located for the ECM. Would it also be located under the battery tray?

[@felm3283]

an excellent diagnostic master. it was a headache but you did it that's important. I have a 2006 Volkswagen Touareg 3.2L no power supply to fuel pump. What do you advise me to fix this vehicle. Thanks

[@Canadiangangstar]

Hi! I have the identical problem but when I probe the last positive wire like you did I get the exact symptoms! But when I took the tape off the wires seem ok. I am curious- could the ecu be faulty if the wires are good? I'm thinking it's that wire- there was a mouse nest on it. But no damage to the wires. Ecu fail?

[@holguineroloco]

You may happen to have the same diagram but for a 2011 vw Jetta ? I saw the two grounds and 3,5 pin but not the rest of the pin, they were not used on my model, i saw the same color wires but in different pin positions. Thank you

[@losesparkplug1190]

Shifter broke while back trying to fix triptonic and i had a zip tie at just right spot but interlock not stopping movement but sat for a year with battery connected so corrosion probably the issue on a wire somewhere.

[@cardoc2477]

nailed it.

[@losesparkplug1190]

Good video, Im having same issue on a 2002 1.8T. I jumped started signal wire but im not sure because its getting 1.4 volts on the starter and i have to check grounds or fuses. New starter but still cant figure it out. I need to get a diagram for the Jetta

[@Z14kt12timandjes1]

Are those VW wiring diagrams? I was glad to hear you say they are crap. (I thought it was just me who thought that). Maybe I'm just addicted to the detail of Mitchell wiring diagrams. I'd have a hard time using those diagrams.

[@PositiveLeadDiagnostics]

The track wiring diagrams are such a pain. Mitchell is pretty good

[@pinpointautomotiverepair1592]

That distortion is definitely pretty neat. Nice find on this one man, It's pretty strange the original repair didn't hold up, it looks like it was shrunk properly and all that, or no?

[@pinpointautomotiverepair1592]

Makes sense to me!

[@pinpointautomotiverepair1592]

Lmao, you do what you've got to do bro. 😂

[@PositiveLeadDiagnostics]

the repair seemed legit

[@lovelandfrogman2136]

Hey guys! So I am getting nearly the same problem as in this video; except my check engine light is on, and I get three distinct beeps when the ignition is switched on, indicating low oil or oil pressure but oil levels are fine; the car cranks but no start and no spark(battery, plugs and coil all fine) I am getting ECM code 01314 on my transmission, brake electronics, Airco and instrument cluster, any thoughts?! Thanks!

[@antonioserrano925]

Where do I find a diagram for a 2006 vw passat 2.0t ecm.I checked all data but they are not very specific with power and ground or fuses related to ecm anyhelp I will apreciate thanks

[@mrsseasea]

I’m working on a jetta 2008 2.5 having same issue, tore off MAS and gave it a try and she started right up? could it be the MAS?