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

[@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

[@kw612]

I just repaired the red and black wire on the ecu wire harness. The code I was getting was with tcm communication po864. Same symptoms fans ran at key on and no cel on dash. Cut the harness back and found the broken wire right where you showed it. Runs like new. Thanks a million !!! 2008 jetta 2.5 193000 miles

[@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.

[@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!

[@JosePerez1973]

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

[@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

[@mania002]

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

[@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

[@la1negrita]

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

[@natanV798]

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

[@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.

[@brayanguzman4657]

Bro you are awesome i just fixed a 2008 jetta following your steps. Wire black and red had corrotion got my power and check engine light back thanks for this video

[@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.

[@awudubannaf8608]

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

[@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.

[@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

[@freddy2064]

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

[@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!

[@joelschlueter]

Found the same harness area ( with your help!!) in the wife's 07 Jetta, kind of a moisture trap in the harness under the cowl. Thanks!!

[@joelschlueter]

FYI there was no previos repair for me to find only the green crusty trail to the busted wire.

[@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!!

[@lukefolger8480]

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

[@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 👍

[@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!

[@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.

[@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!

[@orville58]

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

[@robertsimkins325]

After many days of fighting the same thing on a 2010 VW Jetta 2.5, and replaced cam sensor , crank position sensor, battery, clock spring, and many other problems , car would continue to shut off while driving. Pulled ECM OUT , while connected and shook wire harness , car shut off, and it was wire 62 corroded in the bundle. Why is this not a recall? Thank you soo much for this video.

[@gustavomartinez324]

Wow bro u truly the VW expert

[@woody95124]

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

[@PositiveLeadDiagnostics]

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

[@nadineoubida2127]

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

[@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

[@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

[@Litor2121]

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.

[@cultusgti]

Nice work sir i like your integrity grit and passion

[@EXOVCDS]

Nicely done!

[@sethwright]

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

[@adishajrovic2082]

You are the future Scanner Danner !!

[@train4905]

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

[@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

[@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 !

[@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!

[@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.

[@jbb5470]

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

[@darrenflounders2803]

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

[@timbrown6593]

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

[@AmazingByAccidentgaming]

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

[@AmazingByAccidentgaming]

@@Jeremya74 have a nice day

[@Jeremya74]

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

[@stevethedonful]

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

[@buddiec]

Dude that was awsome great trouble shooting skills

[@fieldsofomagh]

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

[@lweeeluay]

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

[@jgeorges3061]

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

[@baks6890]

That was perfect and very instructive 👏👏👍

[@sandyande]

thanks Tommy, great learning video cheers sandy

[@eladio4365]

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

[@CarDocQatar]

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

[@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.

[@ojong20521]

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

[@OscarHernandezMOhm]

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

[@richardmcwhirter9396]

Great work once again thanks for sharing 👍

[@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

[@AutoFocus-se]

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

[@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.

[@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.

[@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

[@email2201]

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

[@StevenPatrick]

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

[@unlimited408mike]

Great video very good job 👏

[@lovergirl911007]

Great Video! I'm new to the VW scene. I watch the video w/scannerdanner. Since you are an VW expert, let see if You can help me. I have a 2012 VW Jetta SE (manufacture 9/11) with "link error" on scan tool. All fuses/relays good, New battery. However, R/ turn bulb, R/ mirror & R/ taillight solid "on" had to remove fuse F48(20a). No: Turn Signals/Hazards, Pwr Win/Locks (but they are illuminated), Horn, F/ 12v Socket, A/C controls (no pwr), Interior Courtesy lamps/lights, Brake light/tailligts (when pedal press or headlights Lights on), "Park" light on, Key Fob,Eng Light on, "Wrench" Symbol "on", & Battery not charging (no light in cluster). I assume was the Vehicle Electrical System Control Module J519 (BCM PQ25, 2 plugs), but I don't know if the Data BUS OBD interface J533 is integrated or not, because I don't know how to identify my BCM PQ25, meaning "High or Low" version. Since the scan tool get "link error", I'm leaning to the CAN Bus. What are your thoughts? Opinion?Advice? Thanks, Have a bless day!

[@PositiveLeadDiagnostics]

When you say link error, do you mean no communication with your scan tool? The gate way is separate from the bcm. To tell if it’s high or low system. The bcm will have 2 connectors if it’s low and 3 connectors if it’s high. What’s history on the vehicle ? Any water leak issues? Are any fuses missing? Pretty common for water intrusion that leaks directly into the bcm. I would definitely be looking at my network voltages at the gateway. I think the gateway has a red connector to the right of the steering column.

[@lovergirl911007]

@@PositiveLeadDiagnostics Yes, "link error", no communication with scan tool. Its a "low" system J519 T73a/T73b with integrated J533. and Yes Water Flood. Fuses good.

[@familygunsandrides....8024]

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

[@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

[@THREESHOTBANDIT]

Well done Tommy!

[@Zombierippa]

I have a no crank no start 2007 rabbit. I have a check engine light when key is on, but I have code 0685. Everything worked fine until I washed the windshield. I see a lot of leaves and wetness around the ecm harness, not sure what to check next.

[@nnn5666]

Wow exactly the same problem I have from 2007 jetta 2.5. I am not getting any power to ECM . At this point I'm lost I think I'm gonna tow the car to junkyard. And never will purchase Volkswagen again. Wow what a nightmare. Thanks for helping out bro.

[@PositiveLeadDiagnostics]

Check the harness. This problem is so common that vw published it as a tech tip to check the wiring in that location.

[@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

[@aldavies1906]

Im having the same problem with golf mk4 v6 4motion are the pin diagram the same

[@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.

[@isaacc5299]

Great. Question. How do owners realize that you HAD to do all that checking and all the time you took was the only way you could fix it? I mean, do customers that complain about the time you take to fix such a problem pixx you off?

[@jasonkimball3643]

Because customers don’t know about cars and think we just instantly know where the problem is. Electrical issues take time and can be a nightmare. But to them you should know exactly where the problem is instantly.

[@cportisrun26]

I can't get my obd2 scanner or my 3rd party vcds cable to connect to my 2006 jetta tdi brm manual. I've checked all fuses and relays and the wiring.. I've pretty much concluded my ecu might be fried... But im getting a no crank no start problem. Think this could be a fried ecu then?

[@serpentbearer6649]

Man u would be a good friend to have

[@kennethmckee4223]

Great diagnosis simple straight to the point.

[@sara78130]

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

[@alexhyatt3580]

I have 8 volts on the black and purple. Think this could stop mine from starting when it's raining and cold?

[@RafaelTorres-yg4sv]

What happened to the pin #21 black/yellow it a black / purple am I right or it change it on the model of the car

[@lildoggy4u]

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

[@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.

[@Dya90925]

Having a code power supply relay for ecu j271 or j363 can I get any suggestions on where I should be looking in my car it's a 2005 vw jetta 2.5

[@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?

[@mariamelchor9658]

I have a 2014 Jetta that cranks but won’t start sometimes.Diagnostic tool doesn’t give any codes. What could be going on?

[@Pablo_Automotive]

Thanks Tonm for share ☺

[@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?

[@vian303030]

Awesome thanks for sharing.

[@raymilligan9556]

that green corrosion will get you every time!

[@ducte1213]

Where do you get your diagrams from? Got the same problem on a 2014 VW Jetta S.

[@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

[@jgizin]

Also, I noticed the wire you are pulling on is not black and red it looks yellow usually indicating a "repair" but I didn't hear you mention pin 62 was not the color indicated on the wiring diagram.

[@PositiveLeadDiagnostics]

Somebody was there before me and repaired it once already

[@mannymaldonado192]

We’re do I get the diagram my has no ecm communication or power on the dashboard?

[@v.e.7236]

Nice diagnosis! Any suggestions on a 2006 Rabbit 2.5 that will start, but won't shift into any gear? Just drove the car to the store the previous night, but this AM will not shift. DTC U0101 - no comm. w/ the transmission. All fuses glow. ???

[@PositiveLeadDiagnostics]

I would do a visual check on the tcm. Any recent accidents? I think on some models they put the tcm behind the drivers fender. If that’s ok. Check all powers and grounds at the tcm. If you look on scannerdanners page we did a tcm no comm on a Jetta that ended up being a misplaced fuse.

[@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.

[@getsudatensho]

Hi i got a 09 jetta 2.0 check engine light is on the car turns over but i got no power to any of the ignition coils you know what it could be