Two problems related to car will not start have been reported for the 2009 Volkswagen Jetta. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Volkswagen Jetta based on all problems reported for the 2009 Jetta.
The "under hood fuse box" was replaced in may 2014 under recall #97am. When the weather turned cold the car began to get hard to start, the engine light came on, and when it turned very cold the car would not start at all. I took the vehicle back to dealer, they cleared the code and said if the code came back they would need to replace the "glow plug control module". When I came home I started searching the "tdi forums" for similar problems. I found others had the same issue and someone found the solution. When the fuse box was replaced, there is a little jumper (vw part number: 3c0-971-249) (cost $5. ) that goes in a relay slot (r2) that sends power to a 50 amp fuse (sb27), that sends power to the "glow plug control module" (j179) that sends power to the glow plugs when the engine is below 18 degrees c, allowing the engine to start when cold (and without smoking). ** problem is that there is no legend provided for the under hood fuse box, so no way to know if something is missing. This is also a safety hazard because if someone would pull a fuse and not pay attention, there is nothing to indicate where or what size of fuse to put back in. This could effect anything from headlights to abs.
Driving down freeway at 61mph, engine turns off. No power steering or breaks while I changed lanes in heavy traffic to get to the shoulder of the road. Car would not start and had to tow to the dealership. Dealer replaced battery, primed fuel system, gave car back. After five days, check engine light came on, so I took car to dealership. They replaced glow plug control module and gave car back. Driving down highway when car again dies, engine turns off without warning. I have to change lanes again with no power steering or breaks to get off the road. Towed vehicle to dealership where they say the high pressure fuel pump needs to be replaced. This is a very scary and dangerouse problem to have a car turn itself off while driving down the freeway.