Question about 2003 Volkswagen Jetta TDI

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I have a 2003 VW tdi - the glow plug light is consistently coming on. I have had them replaced several times over the last year. What can I do to fix this problem long term?

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Check your relay and wiring bridge. Either could be faulty and throwing a glow plug code. Start by diagnosing the relay since this is the cheaper of the two. Go to the TDIclub.com forums and look up glow plug and you will get an excellent writeup on exactly how to do this.

Posted on Dec 23, 2010

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Where are the three glow plugs that are used for the heater/cooling located on an 02 vw jetta 1.9L tdi?


In addition to the 4 primary glow plugs, the cooling system also has 3 Coolant Glow Plugs to help provide extra heat to the cooling system in order to warm-up the vehicle's interior more quickly, and enhance overall engine warm-up time. (Example - Some Mercedes diesel engines use electrical heaters in the cabin because their engine is so thermally efficient.)
Likewise, this auxiliary source of heat from the 3 Coolant Glow Plugs is necessary because of the VW 1.9 TDI engines outstanding efficiency, which wastes very little heat.


The 3 Auxiliary Coolant Glow Plugs are located at the end of the aluminum cylinder head (in a protruding flange) directly below the vacuum (brake booster) pump, which also connects to a coolant hose.

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The 3 Auxiliary Coolant Glow Plugs use two (underhood) relays which are monitored and controlled by the ECU. During a cold start, the vehicle's interior temperature selector switch helps the ECU choose one of three modes depending on the amount of heat required to warm-up the coolant.

For example, Coolant Glow Plug #1 can be selected to operate all by itself, or #2 and #3 can operate together as a two-some, or lastly, all three glow plugs can form a triple source of heat for maximum enhancement of engine warm-up time.

After the engine is completely warmed up and the thermostat is open, the Coolant Glow Plugs normally shut-off and remain off unless the (thermally efficent) engine cools down sufficiently to have the computer signal them to come back on to keep the engine and cabin air warm. Extensive idling times at stop lights or in the driveway are scenarios where these glow plugs are most likely to recycle on and off.

In conclusion, the period of Preglow and Afterglow is determined by the engine's coolant temperature (during a cold or hot start), which helps the ECU select a predetermined time-cycle for the combustion chamber and / or Auxiliary Coolant Glow Plugs to follow.

Finally, one myth that needs to be immediately debunked, is the belief that the TDI's advanced Glow Plug System is linked to the opening of the driver's side door, which is false! It is also noteworthy to mention that some earlier VW diesel glow plug systems were operated in this manner, but not so with the advanced VW Jetta 1.9 TDI engine.

Dec 16, 2010 | 2002 Volkswagen Jetta TDI

1 Answer

Hi I drive a 2006 Vw Transporter 2.8 TDI, the glow plug light


You've probably solved this by now, but just in case... it's your particulates filter clogging up and needs 'regeneration' by VW techs. They take it on the road and with the aid of a laptop on the pax seat, inject fuel into particulates filter and 'burn it out' it'll cost you 200 quid at a vw dealer.

Feb 21, 2010 | 2004 Volkswagen Eurovan

2 Answers

I have a 2003 Jetta TDI and the coil light comes on and flashes


Amazingly enough, If one or more of your brake lights is burned out this can cause the Glow plug indicator to flash, replace the burned out bulb(s). This often sets a Code but will not turn on the Check Engine light. It took me forever to find this solution first time it happened. I've seen it many times since.

Dec 30, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

I have a VW Golf gt tdi 150 bhp, my glow plug light has just come on.. Please can anyone help.


most time when glow plug light come on your glow plugs not working.check fuse if fuse is good problem is in glow plug relay.

Dec 09, 2009 | 2002 Volkswagen Golf

2 Answers

It has come on three times in the last week. Each time, I take it to my VW certified mechanic. He runs the diagnostic machine. It returns a error code on a glow plug, but when he checks the glow plug, it...


Replace the glow plug as they get older they carode and will short under different condtions and may be shoing low voltage, and when it sets a code for the check enginge light three times the light comes on Just replace it, if it goes out it could damage your engine, this is one of those times testing does no good you have to remove it to look at it, I am a diesel truck mechanic and run into this all the time Please rate my answer for my tiem. Thanks avid101

Jul 29, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

Glow plug error


When was the last time you had your timing belt replaced. Did you do it yourself.

I had mine changed last year and I have known for an entire year that the timing was off slightly. The check engine light WOULD NOT turn off not matter what I did and it kept reading a bad glow plug.

I finally fixed the timing (the camshaft sprocket was off only one tooth) this past Sunday and the check engine light finally turned off all by itself!

Not sure if this fixes your issue, but, it fixed mine.

By the way, if you need the tool kit for fixing your TDI's timing, by it from dieselvw.com. This guy sells a 3 piece kit for $49 where other websites sell a two piece kit for $125 or MORE! I used the kit and it worked flawlessly and the extra piece (the tensioner wrench was handy!).

Apr 05, 2009 | 2002 Volkswagen Jetta TDI

9 Answers

MY GLOW PLUG LIGHT IS FLASHING IN MY DASH BOARD VW 1997 PASSAT TDI.WHAT IS MY PROBLEM?


Despite what you may read from other comments....The glow plug light is simple a multi function warning light and IS among many othed things in fact used to warn of brake light and brake light switch failure. Therefore it can NOT be treated as glow plug problems only.
I have worked on V.W for many years and have encountered this problem many times. You should get the OBD codes read. This will reveal the exact problem...and there may be more than one
You can contact your V,W agents if you wish and check to see if I am correct.
Best of luck
John

Mar 21, 2009 | 2002 Volkswagen Jetta TDI

1 Answer

VW Sharan 1997


Depending where you live if the temp. is over 45 degrees F the glow plugs shouldn't be needed for the engine to start. Have you ever had the check engine light come on? Your problem is probably not in the glow plugs.

Mar 13, 2009 | 2003 Volkswagen Jetta TDI

2 Answers

Brake Lights 2003 VW TDI Golf not working???


replace to updated brakelight switch

Nov 23, 2008 | 2003 Volkswagen Golf

5 Answers

02 VW engine light that stays on


You probably need to replace the glow plug harness. The contacts in the boots that connect to the glow plugs get corroded and throw off the resistance of the circuit. The controller in the VW measures whether your glow plugs are good or not by testing the resistance in the circuit. Test all the glow plugs like DickyIV1 stated and if they are all good try cleaning out the crud on the contacts in the glow plug harness. You will then either need to clear the error code or wait several trips for it to clear itself. If it never clears itself or if it comes back on after you clear it then the glow plug harness is too much of a mess. This is really common on the TDIs (mine needs to be changed but i have been putting it off and ignoring the mil light). When I first tried cleaning the harness on my car it didn't give me a problem for another year and a half. But I knew I'd eventually be changing it.
The other thing to keep in mind is that you should change out glow plugs as a set. It causes less problems in the long run since if one failed you will probably find other will soon fail and it keeps all the resistance close to the same value.

Jul 16, 2008 | 2002 Volkswagen Jetta TDI

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