Why won't my 2012 VW Jetta tdi start?

Asked by Jun 17, 2015 at 08:17 PM about the 2012 Volkswagen Jetta TDI w/ Nav

Question type: Maintenance & Repair

The high pressure injection pump failed on my 2012 Jetta tdi so I replaced it and now the engine won't start. I check the fuse and tested both electric fuel pumps to make sure they were good. I primed the fuel system after replacing the pump. When I turn the ignition on I don't hear the fuel pump turn on at all. What could be wrong?

10 Answers

7,705

Check your relays and fuses, Also check the wiring harnesses under the car for daamge.

1,205

Did you replace the fuel filter? What caused your pump failure? If there are metal fragments in the system the injectors may be bad too.

It turned out to be the fuel pump relay.......thanks

1,205

Glad it's resolved. Thanks for posting the solution.

7,705

Keep in mind the 2010 -2014 jettas all have moisture issues in the cabin. So if something like your dash unit or headlights stop working its probably due to the moisture build up inside your car. it ussaly can't be helped and is probly half the reason your relay failed in the first place.

1 out of 1 people think this is helpful.
1,205

Deathjam, what causal issues have you seen to create moisture? I haven't seen water intrusion issues in this generation of Jetta.

7,705

I have seen alot of issues mostly in the dash unit and head light control switches. This causally happens more in the winter time tho. I have a 2012 jetta and during the winter one day i went out o my car and grabbed my sun glasses out of the roof holder and they were all covered in ice.. i was like wtf?? looked up and there was a large patch of condensation in there. in some extreme cases the water freezes and causes the switch to malfunction i had water in my vacuum which tore the seals to pieces and that was all condensation. i even had condensation build up and form water in the engine and get into my oil pan froze and nearly grenaded my engine cause it froze the sucker pipe for my oil up. they had to manually drop the pan and scrape it out on a fresh oil change maybe 2000Km from before that. I do short trips in the winter so the constant hot cold causes this for engine issues. but long runs can cause build up in the cabin regardless. I had a audi 5000 once. the moisture was so bad in the cabin i had to use a scraper on the window and during the summer i called it the sweat box cause it was always stifling and moisture ridden :P but that all said i have answered a number of moisture related issues in jettas and gotten to know most of the problem area's So moisture is usually only a problem during cold weather.

I have another guestion. 2012 jetta TDI, diesel. it will crank over like it should. glow plug light is out like it should be after they warm up. but the engine will not fire. i spray starting fluid in the air horn and it fires right up. i hate using starting fluid because after years in the army I've seen diesels turned into either babies more times then i can remember. can anyone help me out. the pick up pump was replaced on advice of a friend. did not help. fuel pump is good. like i mentioned before it cranks like normal but no fire. runs great after it starts. any one with a clue what i am looking for i should mention that two mechcanic's have looked at it one said computer needs re-flashed? the second said $6500 to replace every wire in the car yeah i called bulls@$t one that one.please help if you can its a beutiful car but it got me at my last nerve.

1,205

May be a good idea to perform a compression test to make sure the engine is internally alright first.

7,705

chris brings up a logical test. I don't know alot about diesles myself but i am sure like most VW cars they require clear air ways and lots of vacum power. So i would check out all the vacum lines and any crank cases hoses.

Your Answer

Add photo

Related Questions

  • Tdi won't start 5 answers

    Have a 2012 Jetta tdi and when I got back from vaca (it sat for a week in 30-40 degree temps) I went to start and it barley turned over and now it's completely dead. Almost like the battery is to...

    2012 Volkswagen Jetta TDI

    -

    Maintenance & Repair

  • 2010 Jetta Broken Stereo 737 answers

    When I turned on my 2010 Jetta TDI yesterday the stereo system did not turn on. Touch screen is black and doesn't respond at all. I have checked the fuse under the hood and behind the radio, but t...

    2010 Volkswagen Jetta TDI

    -

    Maintenance & Repair

  • 2009 vw jetta tdi will not start though engine is turnig enough to start 17 answers

    2009 vw jetta tdi will not start. engine is turning sufficiently and battery is fully charged

    2009 Volkswagen Jetta TDI

    -

    Maintenance & Repair

  • 2012 jetta car won't turn off , help? 24 answers

    My key won't turn the car off when it is running. I have a 2012 manual jetta. The steering wheel is not locked. Key feels like its going to break off and I can't turn it. I switched to using my spare...

    2012 Volkswagen Jetta SE

    -

    Maintenance & Repair

  • Can VW be trusted ? 12 answers

    Now that VW has admitted to deliberately rigging their cars to fool emissions standards and pollute up to FORTY TIMES over other cars, would you think they might not be honest about other things. ...

    2012 Volkswagen Jetta TDI

    -

    General

Jetta

Looking for a Used Jetta in your area?

CarGurus has 29,777 nationwide Jetta listings starting at $1,200.

ZIP:

Search Volkswagen Jetta Questions

Volkswagen Jetta Experts

#1 FordNut
FordNut
Reputation 2,120
#2 Goodwrench707
Goodwrench707
Reputation 1,990
#3 Deathjam4
Deathjam4
Reputation 1,300
View All

Related Models For Sale

Used Volkswagen Passat
242 Great Deals out of 21,305 listings starting at $1,700
Used Volkswagen GTI
124 Great Deals out of 6,282 listings starting at $2,299
Used Honda Civic
1,148 Great Deals out of 64,599 listings starting at $1,195
Used Volkswagen Golf
45 Great Deals out of 2,987 listings starting at $2,223
Used Honda Accord
1,188 Great Deals out of 77,676 listings starting at $969
Used BMW 3 Series
1,780 Great Deals out of 40,587 listings starting at $1,350
Used Toyota Camry
1,499 Great Deals out of 100,462 listings starting at $700
Used Toyota Corolla
1,327 Great Deals out of 67,646 listings starting at $1,595
Used Audi A4
340 Great Deals out of 12,844 listings starting at $1,995
Used Nissan Altima
1,106 Great Deals out of 85,897 listings starting at $1,675
Used Volkswagen Beetle
263 Great Deals out of 8,672 listings starting at $1,500
Used Mazda MAZDA3
467 Great Deals out of 26,995 listings starting at $1,990
Used Volkswagen Jetta SportWagen
24 Great Deals out of 398 listings starting at $3,995
Used Volkswagen CC
103 Great Deals out of 3,603 listings starting at $4,995
Used Ford Focus
1,265 Great Deals out of 58,542 listings starting at $1,395

Used Cars For Sale

2017 Volkswagen Jetta For Sale
11,640 listings starting at $12,034
2016 Volkswagen Jetta For Sale
31 Great Deals out of 1,633 listings starting at $10,278
2015 Volkswagen Jetta For Sale
122 Great Deals out of 3,856 listings starting at $7,995
2014 Volkswagen Jetta For Sale
148 Great Deals out of 3,047 listings starting at $5,977
2013 Volkswagen Jetta For Sale
199 Great Deals out of 3,118 listings starting at $4,995