Question about 2003 Volkswagen Jetta TDI

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'03 jetta tdi glow plug / DRL relay?

I have a '03 jetta tdi. the engine light is on and code reads #3 glowplug. It is fine, as are the rest of the glow plugs. I reset the code and it returns within a day or so. my daytime running lights also don't work. someone told me that they might be on the same relay? could that be true? Or are these independant problems? my backup lights also stopped working. All 3 of these things happened (or were noticed within a week of each other) could they be connected? any troubleshooting hints would be greatly appreciated.

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  • helpyou May 11, 2010

    Let's start with the glow plugs fault. Cylinder 3 fault. You made sure to check the resistance of all glow plugs you said? Because a VW fault of cylinder 3 on TDI's most often means cylinder 2. Their faults read from right to left and not left to right as we normally look at cylinders.

    If yes all are ok check to see if you get power in the rail of 12 volts. If you have a scanner or VAG com you can do out put tests to activate the glow plug relay and see if 12 volts reaches the plugs. Or you can unplug the coolant sensor to simulate a cold engine and have someone put the key on and check if they are powered a few seconds. If yes the relay is good and you most probally need a new glow plug rail. The connections get corroded and make for bad contact causing the faults.

    For the DRL's is your handbrake switch working ok? And have you checked the light switch?

    For the reverse lights make sure the bulbs are good first. Most commonly I have seen the wires going to the reverse switch broken near the starter causing an open circuit.



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How many glow plugs are there and where are their locations

Posted on Nov 29, 2009

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Also, you might need to get a Glow Plug Relay. Most mechanics will replace the rail and the relay together since the fault can start from either end.

Posted on Aug 18, 2010


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1 Answer

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

Engine light on code is glow plug 2 & 4 but all 4 glow plug are new any idees of other problem it could be

You can get a wiring diagram free at for most cars. You need to register on the site free and then scroll to the bottom of the Web page.

There may be a reference to how the Glowplugs are wired and it is possible that they are wired as pairs from the Timer box. This would mean that 1/2 the Timer box is shorted out or that a Relay that controls just that pair of glowplugs is a bad Relay. If there are 2 Relays for the Glowplugs, just swap them and see if the problem moves to a new pair of cylinders. This would confirm a bad Relay.

You may also have a bad ground. Look to see the wiring for the ground circuit. This would be a good bet if each pair is separately grounded. You could also have a problem with not replacing all 4 as a set. I do not know what VW recommends for this.

Perhaps you should test the Glowplugs. You test them by fixing a battery jumper clamp to the bottom of the casing of the Glowplug avoiding the threads. Then briefly touch the top of the Glowplug with the power cable of the Plus charge. Be careful not to melt the part.

The Glowplug should glow equally between the set. They should not stay dark. And remember, the Timer only has seconds to work. That is all the time the Glowplugs have to vaporize the fuel.

I am curious to know what you find.

Dec 15, 2012 | 2003 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

1 Answer

2000 jetta tdi , went to start it glow plugs wouldnt come on , after awile it started, automatic tranny wouldnt shift . stuck in high gear , hat to manually shift it

Hi is this a jetta 4 or 5
If jetta 4 you have to look at the glowplugs itself
If ok check fuses
If ok replace Glowplug relay 103

Dec 08, 2010 | Volkswagen Jetta Cars & Trucks

1 Answer

How often should glowplugs be changed in 2002 VW Jetta tdi

on that car, they had lots of problems with glow plugs and the wiring to the plugs, i would change them every 50,000 miles, there not expensive or hard to change,

Dec 13, 2009 | 2002 Volkswagen Jetta TDI

1 Answer

No power to glow plugs...relay replaced...still no power...jumped 12 v to glow plug side of relay and glow plugs then energize. Can ignition be at fault?(1999 jetta alh)

There is a big fuse in the engine room for the glowplugs.
You'll find it just near the brake vacuum cilinder under a black cap...
Hear if the glow relay ticks when you'll put power on. Does the glow light lights on?

Oct 30, 2009 | 1999 Volkswagen Jetta

1 Answer

Where is the glowplug relay or sensor for the 2006 Jetta TDI?The codes come back with glowplug errors on 1,2,3, and 4. We were told it was the glowplug sensor that was setting off the codes. Where is it?

It's a relay, not a sensor. It could also be the harness - although I don't believe a harness problem would cause all four plugs to show bad. Here's everything you ever wanted to know about glow plugs: (with photos). Check out the rest of the site too - these guys def know their TDI"s...

Jul 12, 2009 | 2006 Volkswagen Jetta

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

Check engine light on, Autozone says "glowplug code"

Take off the glow plug power bar and check each glow plug with an ohm meter. Infinite resistance means it's burnt out. Check the three glow plugs on the right side of the head with your ohm meter as well.
Just removing and reinstalling the bar will fix any bad connections which might also have triggered the errorcode, so when none of the plugs seem broken, that might have been the case.

I had the same faultcode on my 2005 TDI some years ago; it ran perfectly, but after checking under the hood 1 of the plugs was indeed broken.

Mar 22, 2009 | 2001 Volkswagen Jetta TDI

3 Answers

Turning off the check engine light...2001 VW Jetta TDI

You have a few options:

1.) Don't do anything. Once the computer sees the engine run normally for a few cycles, it will automatically clear the code.

2.) Connect a scan tool to the OBDI port to clear the codes manually. Local auto parts stores will often perform scan tool diagnostics free of charge.

3.) If you want to remove the code quickly without any special tools, just disconnect the battery and leave it disconnected for a while. (How long varies for different cars, as some engine PCM's have capacitors that hold a charge for a short while after losing battery power.)

Feb 16, 2009 | 2001 Volkswagen Jetta TDI

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