P0670 Glow Plug Module Failure
Thread Starter
Senior Member
Joined: Aug 2014
Posts: 337
Likes: 20
From: Charlotte, NC
2005 E320 CDI, 2015 GLA 250
P0670 Glow Plug Module Failure
My 2005 E320 CDI has "only" 180,000 miles on it and is giving a P0670 glow plug module failure. Over the years, I've had several glow plug failures, and replaced them with the Mercedes glow plugs (I assume the 5v Beru and not the incorrect 12v Bosch glow plugs).
In a fear of seized glow plugs, I've also unscrewed all of the plugs, coated them with anti-seize, and retorqued them.
But now I'm getting the P0670 Glow Plug Control Module check engine light. The Mercedes manual says I have a Glow Plug Timing Controller and I'm guessing that is what had failed. At $340, I hope I'm correct in this assessment .
Has anybody replaced this module? Did it fix the fault?
Thanks,
Peter
In a fear of seized glow plugs, I've also unscrewed all of the plugs, coated them with anti-seize, and retorqued them.
But now I'm getting the P0670 Glow Plug Control Module check engine light. The Mercedes manual says I have a Glow Plug Timing Controller and I'm guessing that is what had failed. At $340, I hope I'm correct in this assessment .
Has anybody replaced this module? Did it fix the fault?
Thanks,
Peter
Super Member
Joined: Jan 2010
Posts: 563
Likes: 31
From: The Villages, Florida
2006 E320 CDI
I replaced mine at 140k as a preventative measure. My cdi likes to eat the #4 glow plug. So I will see if this makes a difference. I purchased the "control relay" from Huskerparts.com. Part number 648-153-02-79, for $238.00. I had my indie install it which he charged me $150.00.
Close to $400 for a preventative measure item!!!!
Mike T.
Close to $400 for a preventative measure item!!!!
Mike T.
MBWorld Fanatic!
Joined: Jan 2009
Posts: 9,224
Likes: 1,798
From: V E G A S
1922 Ford Model T / no OBD
Before you spend money for the part, take the plug apart and give it good bath with MAF or other cleaner. Doesn't work often, but sometimes it does.
GP relays on W123, W124, W210 would last lifetime or milion of miles.
Now you have computer-controlled fast glows and that cost more.
GP relays on W123, W124, W210 would last lifetime or milion of miles.
Now you have computer-controlled fast glows and that cost more.
Thread Starter
Senior Member
Joined: Aug 2014
Posts: 337
Likes: 20
From: Charlotte, NC
2005 E320 CDI, 2015 GLA 250
Too late to clean it. I replaced the module the other day and now the check engine light is out.
However, shortly after that the #1 injector started leaking bad (maybe an old problem that reached critical mass) and so yesterday I replaced the seal. Something happened to the old seal as I never saw it. It either eroded to zero or I just dropped it before I had a chance to see it.
Either way, the car is running great once again.
Peter
However, shortly after that the #1 injector started leaking bad (maybe an old problem that reached critical mass) and so yesterday I replaced the seal. Something happened to the old seal as I never saw it. It either eroded to zero or I just dropped it before I had a chance to see it.
Either way, the car is running great once again.
Peter
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Joined: May 2007
Posts: 1,252
Likes: 18
From: Blaine, WA
07 E320 Bluetec
Had the glow plug controller go bad a couple of months ago. Bought a 8mm rachet spanner. Took the controller out today, cut it open, repaired it, resealed the cut and put it back in the car. All works now. Total cost was cost of 8mm rachet spanner. Love it when things are this easy.
MBWorld Fanatic!
Joined: Jan 2009
Posts: 9,224
Likes: 1,798
From: V E G A S
1922 Ford Model T / no OBD
Had the glow plug controller go bad a couple of months ago. Bought a 8mm rachet spanner. Took the controller out today, cut it open, repaired it, resealed the cut and put it back in the car. All works now. Total cost was cost of 8mm rachet spanner. Love it when things are this easy.
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MBWorld Fanatic!
Joined: May 2007
Posts: 1,252
Likes: 18
From: Blaine, WA
07 E320 Bluetec
Glow plug module repair
Sorry no pictures. To be honest I found a video on utube showing exactly what to do. Being an engineer and used to soldering etc. made the job easy. I replaced four broken aluminum wires with similar guage copper wires, all of these come off the 12V supply terminal (inside the module) and are soldered to four pads on the circuit board. Extreme care is needed when cutting off a lid on top of the module, then even more care while removing layer of gel from the circuit boad area in question, and then removing the layer of aluminium off the four pads on the circuit board to reveal copper beneath and same thing with the 12V terminal. Though not for the average DIY person it really is a an easy job if you know what you are doing and used to working with delicate circuit boards without damaging anything else since there are surface mounted components on the board.
Last edited by pinebaron; Jun 18, 2018 at 08:07 AM.
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