GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

2008 GL320 CDI CEL P0670

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Old Jan 24, 2013 | 09:15 AM
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From: Charlotte NC area
2019 WS222 S450 4-Matic / 2007 W211 E350 4Matic (Sold) / 2008 X164 GL320 CDI
2008 GL320 CDI CEL P0670

I found these descriptions:
- P0670 states there is a problem with the glow plug control module or glow plug(s)
- P0670 Glow Plug Mod Control Circuit
- Standard DTCs (ISO 15031-6/SAE J2012): Glow Plug Control Module Control Circuit/Open

Some say it has to be the module, and others say it could be one or more glow plugs.

Does the MB ODB port give specific glow plug failure codes? If it does, and I am not getting any, would this not point to the module?

The car starts OK (new to me, and it has been very cold, so I don't know exactly what "normal" starts are like.)

Thoughts anyone?

Last edited by N_Jay; Jan 24, 2013 at 09:22 AM.
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Old Jan 24, 2013 | 12:59 PM
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alx
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it is most likely your glow plug relay.

this is somewhat a common problem.

plugs have been reliable in the 320/350cdi so there is a good chance they are good.
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Old Jan 24, 2013 | 01:24 PM
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2019 WS222 S450 4-Matic / 2007 W211 E350 4Matic (Sold) / 2008 X164 GL320 CDI
Anyone have a suggestion where to order from?

Best price, shipping cost and service.
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Old Jan 24, 2013 | 01:45 PM
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Originally Posted by N_Jay
Anyone have a suggestion where to order from?

Best price, shipping cost and service.
parts.com

glow plug controller

http://www.parts.com/parts/2008/MERC...G%20CONTROLLER

Last edited by alx; Jan 24, 2013 at 01:48 PM.
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