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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old November 18th, 2019, 09:09   #1
Join Date: Nov 2019
Location: SAskatchewan
TDI(s): 2001 Jetta
Default Replaced Heater Core now no start

Replace heater core, had battery unhooked for the duration. Reassbled and now car will run and die after 2 seconds and my immobilizer is flashing. My bad, used valet key off the hop to try to start the car. Can not connect to general obd will not read but got codes through VAG com. Immobilizer pick coil, key signal too low, ECM no communication. Abs and air bag. Iíve checked all fuses seem to be good, tried all the tricks on you tube. Also not getting my glow plug light either when key is turned. I have had the cluster out and checked the connections. After first assembly the gauge cluster was blank. Took it out and redid the connections now it seems to be working. Help!
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Old November 18th, 2019, 10:55   #2
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Join Date: Dec 2001
Location: St Louis
Fuel Economy: fantastic

Check all the connections to everything on the steering column, too, as well as all the ground points.
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Old November 18th, 2019, 13:25   #3
Join Date: Nov 2019
Location: SAskatchewan
TDI(s): 2001 Jetta

There are 2 grounds at the air bag connection would that do it ? Steering wheel is currently removed
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Old November 18th, 2019, 23:13   #4
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Join Date: Jul 2007
Location: Portland, effing Oregon

Among the tricks on youtube, was one of them putting in the proper key
and turning to ON position and leaving it for 15 minutes?
Also, is your 109 relay black (old/defective) if so replace with the new gray model.
But try the key thing first.
2003 Jetta TDI 1.9L 5-speed
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Old November 19th, 2019, 01:54   #5
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Join Date: Mar 2009
Location: Morocco

I bet itís missing earth points like oilhammer and trgreen says
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