Because of issues with the glow plugs and/or the glow plug wiring harness from the control relay, the Check Engine Light may illuminate. Our technicians tell us there is a service bulletin, not a recall from Volkswagen regarding replacement of the glow plugs on 2004-2005 model years only.
Check Engine Light Due to Issues With Glow Plugs/Wiring Harness on Volkswagen Jetta TDI
Average mileage: 113,054 (3,500–260,000)
Exhaust & Emissions affected: 1.9L 4 Cylinder Diesel Turbo
82 people reported this problem
50 people shared problem details
2002 Volkswagen Jetta TDI128,000Visitor
Good evening all. I have had this same problem (engine malfunction/check engine light) 3 times now. The first time, I replaced the glow plugs. The second time, the harness was replaced at the dealer (8-12). Today (12-3-12), I found out after spending $98 that the glow plug circuit #1 was bad. The dealer did not even check the glow plug to see if it was bad. I am going to get my car and put a new glow plug in #1 and see if this fixes the check engine light issue. If not, just going to keep on driving it. If there is a notice from VW on this issue, it should be a recall to fix this issue instead of customers having to spend their money on a known problem. Get with it VW!!!!
2006 Volkswagen Jetta TDI90,000Visitor
just had timing belt and water pump replacement. 12 hours later, I now have a #2 glow plug issue. Could it be somethihg the dealer did?
2003 Volkswagen Jetta TDI100,000Visitor
I have had this problem before. 1st the VAGs don't always give the exact problem. The common glow plug #3 error code could mean the problem is anywhere in the harness or plug set. In my case I found that replacing only the plug in error did not work. Even if all contacts are clean, the harness is good, and all of the glow plugs are OK, if there is more than a 3ohm difference in impedance between any of the glow plugs the code will not go away. Put the plugs on a meter to find the culprit or if they are a few years old just replace all 4. Then clear the code with a VAG.
2013 Volkswagen Jetta TDIVisitor
My check engine light came on and I took my car to the shop and they said the glow plugs needed replaced I haven't even owned the car 4 months yet.
2006 Volkswagen Jetta TDI106,600Visitor
The dealer checked the diagnostic code when the light came on and it was for the glow plugs. The engine light came on, however, only when the car was cool. I had to have the glow plugs and wiring harness replaced which cost $648. This issue occurred 4 days after I replaced my timing belt, water pump and thermostat as recommended maintenance. My car is a 2006, not within the range reported with this problem.
check engine light stays on no matter what maintenace done and has been taking up to three times to start, then sounds rough for 10-15 min. of idle/drive time. I just had to replace my ENGINE! AAAGGGHHH Due to blown piston in my 2003/04 jetta desiel wagon. 4/4/2011 and now new different engine same mileageyear put in and has diffucult starts. I'm freaking out it cost me 4,000 to put in different engine.
2013 Volkswagen Jetta TDI7,100Visitor
2014 Jetta TDI Manual. 4 months old. First cold morning of the season, check engine light came on. Took it in, they replaced a glow plug. Two weeks later, same thing. Took it back in. This time they are consulting with some service specialist, and I think they are planning to replace the harness. Dropped car of Friday at 7 am, hoping they will resolve early next week. Also reading up on Florida Lemon Law.
Not able to pass smog because the check engine light continues to illuminate I have change and corrected all of the problem s ..
Hasn't been fixed. Replaced glow plugs(as recommended ) Diagnosis was to repace #2 plug
rough start or will not start in cold weather. My comp. scanner read code " #1 glow -plug " dealer suggested maybe relay board, we sold a lot lately. but would garentee this would fix the problem. So I don't trust them working on my car, I bought new from them.
2011 Volkswagen Jetta TDI80,000Visitor
I have now had three engine harness/glow plug harness failures in 80,000 miles. The repair is $1,000. Clearly volkswagen has failed to "fix" the problem. Simply put the vehicle is not reliable.
2009 Volkswagen Jetta TDI89,000Visitor
Faulty glow plug #4 error code. The glow plug was tested and the pressure sensor on the plug was bad, but the glow plug portion of it worked fine. Less than a week after having it replaced, the error code returned. Now the dealership is claiming it's an issue with the harness connector (not the entire wiring harness)for that glow plug and needs to be replaced. It didn't pass "the wiggle test". I haven't let them replace it yet because I don't trust them.
2002 Volkswagen Jetta TDI247,000Visitor
glow plugs # 3 problem engene light. replaced all glow plugs didn't help
2009 Volkswagen Jetta TDIVisitor
Glow plug about 6 different times. Loss of power on the highway numerous times. Once when leaving the dealership after supposedly fixing the issue. Dealer always stated that the glow plug light was just an indicator to a problem which seemed to be a different sensor each time which rules out the possibility of a lemon law.
2002 Volkswagen Jetta TDI150,000Visitor
#2,3, and 4 glow plug circuits fail
2010 Volkswagen Jetta TDI69,000Visitor
check engine like comes on about #2 glow plug.
2010 Volkswagen Jetta TDI88,500Visitor
check engine light came on 5 days ago. did go off briefly a couple times. took it into shop. #3 glow plug bad....$349..... what causes this?
2003 Volkswagen Jetta TDI30,000Visitor
Bought car new in 2003. Check engine light illuminated sometime within first two years, don't remember now. It was diagnosed as a short somewhere in the glow plug harness and to fix it was going to be several hundred bucks. Mechanic asked if I had trouble starting it in the winter and if not he would wait until I did. Car has 246,000 miles on it now and have never had a starting problem in the winter due to the glow plugs. Anytime I have had any other work done the only code it shows when scanned is the same glow plug code. I just ignore the light. Car has always run great and gets 46-52 mpg so it ain't worth fixing.
2005 Volkswagen Jetta TDI180,000Visitor
Glow plugs were replaced in 2011 at 152,000 miles under a recall issued by Volkswagen. Prior to the recall, experienced no glow plug issues. Routine failures began within a year afterwards. Because of other issues involving the dealer, I refuse to return there for further investigation and have had a competent diesel (Firestone) mechanic replace 3 additional sets for all 4 cylinders since. Have also learned that this mechanic conducted repairs using the advice involving the dealer. Now with the car at 218,000 miles, the most recent replacement was done in February 2015. OBD codes involving the glow plugs began appearing again in June. Firestone has been instructed NOT to involve the dealer any further regarding any maintenance and repairs. Firestone also is investigating additional causes for the OBD callouts and will make any repairs under warranty.
How essential is the glow plug harness for vw to run properly?
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