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Kevin, VW Mechanic
Category: VW
Satisfied Customers: 2158
Experience:  Diagnostic technician at vw/ audi specialist
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I have a 2010 VW TDI with a check engine code of 684 and

Customer Question

I have a 2010 VW TDI with a check engine code of 684 and dealer replaced the glow plug module but after 150 miles is on again -- there is no listing for that code anywhare
JA: Do you have the trouble code? Do you have a code reader or scan tool?
Customer: yes
JA: Great. If you share the code with me, I'll pass it along to the VW Mechanic. He'll be able to diagnose your issue much faster with a code. What is the model of your '10 VW?
Customer: I gave it to you -- P 684
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Np I told you the dealer fixed it but it is on again -- they screwed up and did not fix it
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 9 months ago.
Category: VW
Expert:  Kevin replied 9 months ago.

This code indicates an issue between the engine control unit and the glow plug control relay .in most cases it is the relay thats at fault but it can also be a wiring issue causing this fault .the loom will need to be tested

Expert:  Kevin replied 9 months ago.

Please rate my service and let me know if you need anything else at all