P0670 Glow Plug Module 1 Malfunction - Club Touareg Forums
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post #1 of 11 Old 12-04-2018 Thread Starter
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P0670 Glow Plug Module 1 Malfunction

Having an issue with 2004 touareg v10tdi. I have 2 brand new batteries in the vehicle. I keep getting P0670 code glow plug module circuit malfunction. Having trouble finding information to diagnose this issue. Started last winter and now the vehicle will struggle when starting outside in the cold. The VW wiring are not very friendly to follow. Thanks in advance.

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post #2 of 11 Old 12-04-2018
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Most likely it is low voltage when cranking with the starter battery (rear hatch battery). Just monitor the voltage when cranking and see if you get a big drop...I know you replaced the rear battery but if it is not charging it wil cause the problem you are having.

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Just checked voltage cranking it hold 12.6 volts. If I clear the code it comes right back without starting vehicle again. So it is definitely seeing the fault right away. Where should I go next? I seem to definitely have an issue I the glow plug module circuit or module itself if its a stand alone module? I see a relay for the glow plug but no module location listed in any manual or searching of any forums.

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post #4 of 11 Old 12-04-2018
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What is the voltage of the rear battery at idle?

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post #5 of 11 Old 12-05-2018 Thread Starter
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At idle running is about 13.3 volts. It doesn't change when cranking. Almost like that battery is not being loaded? I need to figure this out it will not start effectively when cold out and we are supposed to hit about zero* F. Is there an actual glow plug module or just a timed relay triggered by the ECU? I can clear the codes and it comes right back without trying to start the vehicle. Any other insight is greatly appreciated.

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post #6 of 11 Old 12-05-2018
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The module is a relay under the cowl on the drivers side. There two of the same modules there. Is you code on both engine 1 and engine 11 in vcds? If not you can try and swap the location of each and confirm the one that is bad. That also would eliminate a bad driver in the ecu.

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post #7 of 11 Old 12-06-2018 Thread Starter
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Ill give that a try. I m not sure if the code is both engine 1 and engine 11. I can look and verify later. Ill swap the relays. Thanks for the heads up.

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post #8 of 11 Old 12-06-2018
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I would want to look at the battery switch under driver seat for copper color showing indicating rear is connected.

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post #9 of 11 Old 12-06-2018 Thread Starter
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Where is the switch? I have a hunch that it may not be kicking in the rear battery? What is the relay /switch near the rear battery? It is 10^ and it cranked very long and didn't want to start like no glow plug operation and I noticed the transfer case selector was flashing like the voltage went low.

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post #10 of 11 Old 12-06-2018 Thread Starter
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Did some more looking . The relay/ solenoid at the rear battery has some corrosion. I moved the battery cables so they are together instead of having to go through the relay/ solenoid. Seems to not throw the code I cleared it and tried multiple times and it did not set the code again so I may be on to something. not sure why they just don't connect both battery together instead of having a relay or solenoid controlling the cranking battery?? A VW thing I guess. I come from the world of diesel trucks and both batteries are tied together always. Any insight or is that relay needed??

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