Question about 2001 Volkswagen Jetta TDI

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I have a 2000 jetta tdi that is hard starting when cold. I tested the glow plugs and the glow plug harness and both are good. Also it sets a fault code of Po380 Any ideas?

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1998 jetta TDI glow plug dash light comes on for only one second


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My 2003 vw jetta tdi was running rough like a glow plug went out. I tested the glow plugs with a digital multimeter, one of the tested bad and replaced it and the problem is worse now. Could it be the glow...


If the engine is running, it is not the glow plugs as they are only used for cold starting and initial running and are switched off as soon as you move the vehicle or after 90 seconds, whichever comes first. You may have an injector issue or a turbo issue where the intake blades are clogged, the exhaust blades are clogged etc.
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3 Answers

Will not start in cold weather. Starts great if temperature is above 20 degrees. New battery and no problem found by mechanic.


There is a 5th injector called the cold start injector, that is electrically controlled off the starter. You can easily unscrew it while still attached to hoses and wires, and watch it squirt. You can also verify it is getting voltage with a test light or meter. There is also a thermal timer for it that could be bad and preventing current from the starter.

Jan 03, 2010 | 2002 Volkswagen Jetta TDI

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2001beetle tdi hard starting


The stuff that you replaced could have an effect on the starting of the vehicle. Take the diesel pump and injectors for calibration this should solve the problem.

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this is a common problem for these cars glow plugs go bad like spark plugs however the smoke would lead to bad mass airflow meter. it is not telling ecu corrcet miss. disconnect mass airflow meter. when cold see if this makes it start better. it should would means you need new m.a.f. glow plug issue take a test light place clamp on positive of battery then pull off glow plug connectors place tip of test light on glow plug the bad one will have a dull light unlike the good one which will be brighter. will need new plugs and wire harness four **** connectors and wire striper and crimper will fix concern good luck

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very common for the harness that plugs onto the glow plugs to have too much resistance it will still work but will set codes

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1 Answer

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I have same problem either glow plug circuit relay or power signal from main computer faulty. Could also be bad wireing harness they are notorious for this. We put a larger battery (higher cca) in to compinsate for excessive cranking a year later were changing the starter it seems summer comes and we blow it off till its noticable again. If you fix exact problem please let me know what it was if possible. GOOD LUCK and Thanks!

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1 Answer

2000 vw jetta tdi glow plug problem ?


Ok , ok. Give me some more information and we'll solve this. We're talking about a jetta TDI 2000 with an ALH engine code I figure.
#1 Do you have an faults recorded in the ECM like a check engine.
#2 Are you using synthetic oil 5W40 preferably Castrol?
#3 How old is your fuel filter?

Oct 30, 2008 | 2000 Volkswagen Jetta TDI

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