Question about Volkswagen Jetta

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

I replaced the relay/fuse is ok/new glow plugs and new harness 2-wire . The car will start and run but takes for ever to get going. I put a test light on harness. It's not getting any power until the car is running, after it starts the plugs get 12 volts. I put a jumper to the battery and it gives the plugs power.

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  • Volkswagen Master
  • 1,098 Answers

HAVE YOU CHECKED WHETHER THE FAULT IS ON THE GLOW PLUGS RELAY?

Posted on Nov 08, 2012

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: Nissan vanette not starting from cold

My vanette had exactly the same problem yesterday. The glow plugs have a timer and a relay. I think that if the light on the dash goes on and off as normal then its probably the relay not the timer. So I have replaced the relay (£50 nissan dealer only) which is located in the center console below the radio/heater controls. Until its really cold again tomorrow I wont know if its really cured it but I'm fairly certain that will be it.

Posted on Nov 01, 2008

  • 1 Answer

SOURCE: No glow plug light, car turns over but won't start, no CEL or codes

I don't have the solution but a possible help in diagnosing.  If you remove the water temperature sensor connector from the sensor, the glow plug light should stay on when you go to start the car.  Try leaving it on for 15 seconds and then start the car.  If it starts right away, it is your sensor.  If it doesn't, the good luck.  
The sensor is located on the right side of the engine near the top, at the back.  It is in the coolant fitting directly behind the hose from the rad, just left of the thermostat.  Be careful to disconnect the wires, and not remove the sensor, or you will loose a lot of coolant.  The sensor is held in by a separate plastic clip, and the harness just has a little built in clip on the side.  Hope you have small hands...

Posted on Jan 06, 2009

  • 102 Answers

SOURCE: 2002 Jetta TDI check engine light

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

Posted on Mar 23, 2009

shadtremonky
  • 353 Answers

SOURCE: 1997 Buick Park Avenue Ultra. Replaced battery,

recheck your body ground may have surface rust on bolt, body, or connection

Posted on Aug 21, 2009

  • 3 Answers

SOURCE: glow plug system will not cycle

Do you have dual fuel tanks? Place the return fuel line from the back of the fuel pump in a bucket and see if it will start. If yes replace the fuel tank switching valve. It may switch supply side ok, but not return side and if so it is plugging the return, which will cause a no start stuation. If it starts running the return line into a bucket replace the switching valve.

David Floyd
tnbroker1@yahoo.com

Posted on Feb 15, 2010

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I have a 2000 jetta TDI 1.9L. The glow plug light is flashing off and on and the car is running terribly. Code is reading P0380/glow plug monitor circuit. what do I need to do to fix the problem?


the code is for the Glo-plugs circuit A --malfunction=== causes wiring--glow plug relay--fuse-- glow plugs---ECM. Check the relay and the fuse

Oct 31, 2013 | 2000 Volkswagen Jetta TDI

1 Answer

Glowplug light comes on and goes off quikly, engine hard to start. Changed all 4 glow plugs and coolant sensor. Light stays on for a good 10 seconds when water temp. sensor is unpluged.


The glow plugs work in direct relation to the engine block temp. The relay for the glow plugs is obviously reading the wrong temp, that's why they turn back off. It's most likely that the temp sensor is bad, but trace the wires back and make sure there are no breaks in the insulation and they are well connected at the plug-ins. I have seen a lot of wires at the connector look good but fall off as soon as you touch them.

If the temp sensor is the same on for your your dash, then borrow a heat sensing gun and double check it against the guage. I have seen them read wrong by as much as up to 20 degrees. If the sensor reads rught and feeds both the guage and the glow plugs, then the problem would be either the wire harness or the glow plug relay. Hope this helps.

Oct 26, 2011 | 2003 Volkswagen Jetta TDI

2 Answers

2002 Jetta, how do I remove the drivers seat?


slide the seat right forward and undo the two bolts in the slider then slide right back and undo the front twothen lift it out.when you put it back make sure the bolts are tight....

Mar 30, 2010 | 2002 Volkswagen Jetta TDI

2 Answers

Engine check light on, code P0380, glow plug circuit. What to check.


first check glow plugs resistance values, sorry but i cannot tell you what they are supposed to be at offhand.

if the values are correct then you may need to replace the wiring harness which connects to the glow plugs.

more likely to be the plugs themselves though

Oct 02, 2009 | 2000 Volkswagen Jetta TDI

1 Answer

02 VW Jetta TDI with ALH engine glow plug


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

Sep 01, 2009 | 2002 Volkswagen Jetta TDI

1 Answer

2003 jetta TDI no power at injection pump check all wires thay are ok


Does your glow plug light on instrument panel come on when you turn the key? I'm assuming the car won't start? If no GP light on instrument panel then it sounds like a Relay 109 problem. It's the main power relay. It's a grey or black 1" square relay located under the dash on the driver's side. Give it a smack with a screwdriver or something. You might be able to knock it back into whack. Seriously.
www.tdiclub.com - loaded with tdi info

Jun 29, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

2002 Jetta TDI check engine light


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

Mar 23, 2009 | 2002 Volkswagen Jetta TDI

1 Answer

Volks wagen golf diesel tdi Nreg


Check the glow plug thermo sensor...found in the cylinder head.
Unlightly anything wrong with injector pump.
Good luck
John

Feb 15, 2009 | 2002 Volkswagen Jetta TDI

1 Answer

2000 vw tdi. My glow plugs only stay on a couple seconds...


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!

Dec 21, 2008 | 2000 Volkswagen Jetta TDI

1 Answer

2002 Jetta TDI has no power to glow plug buss at startup


replace the relay but check connections first as often connection get hot and corroded.failing which buy a push button switch use a relay and and some heavy wire to and from relay to the heaters and work them manually.you could try seperating the relay and cleaning the connections inside.

Oct 22, 2008 | 2002 Volkswagen Jetta TDI

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