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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > One glow plug throwing up a fault



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      12-12-2018, 11:50 AM   #1
Bluewater335D
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One glow plug throwing up a fault

Car running fine

if no problem as the car is running OK, presumably just leave as is - - (glow plugs only used for cold starting??)

Foxwell scan revealed fault - NO lights on dash to indicate a warning

can I just replace one, rather than all 6

I read somewhere that if there is a glow plug fault the DPF will not regenerate - am I correct - why would that be if correct

(I can always force a regen with Foxwell)

Last edited by Bluewater335D; 12-12-2018 at 12:00 PM..
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      12-12-2018, 01:14 PM   #2
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Yes the dpf will not regen with any glow plug faults. I believe the glow plugs are used to increase the temperature of the exhaust gases during the regeneration process.
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      12-13-2018, 03:16 AM   #3
rasa bmw
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it will regen,,but you have to keep clearing the fault codes with a device during regen,,read this from an old post on another forum...C110 will force a regen if you clear the 480a /480a1 error



you can have all the glow plugs out it will still regen.



Plug in c110 scanner go for drive and keep deleting the codes as they appear while driving. After few times the errors won't come back and you will see the temp before or after cat (one of the two) rise and stay at 600c for about 10-15mins That is a regen complete,,the c110 scanner is just put in as a guide,,you will probably need inpa/foxwell scanner or equivelent

Last edited by rasa bmw; 12-13-2018 at 03:22 AM..
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      12-13-2018, 04:14 AM   #4
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Quote:
Originally Posted by Bluewater335D View Post
Car running fine

if no problem as the car is running OK, presumably just leave as is - - (glow plugs only used for cold starting??)

Foxwell scan revealed fault - NO lights on dash to indicate a warning

can I just replace one, rather than all 6

I read somewhere that if there is a glow plug fault the DPF will not regenerate - am I correct - why would that be if correct

(I can always force a regen with Foxwell)
It will still regen. I had several glow plug fault codes for about 6 months. No warning lights, DPF still regenned and car drove fine.

I then started to get difficuluty with cold start, changed the glow plug relay which got rid of all the codes.
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      12-13-2018, 11:15 AM   #5
Bluewater335D
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Thanks Guys for your comments
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      12-14-2018, 06:02 AM   #6
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Worth noting the glow plugs are also used to clean up the emissions too, not solely from cold start, hence the lack of regen if the glowplugs are faulty.
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      12-14-2018, 06:34 AM   #7
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Quote:
Originally Posted by lloydie View Post
Worth noting the glow plugs are also used to clean up the emissions too, not solely from cold start, hence the lack of regen if the glowplugs are faulty.
Glow plug faults do not affect regen. My car was doing regens for over 6 months whilst I had several glow plug fault codes.
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      12-17-2018, 04:48 AM   #8
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Hi, I keep getting the fault code 'glow plug cylinder 1 control'. I have replaced the controller but still getting the error code. Was thinking of just replacing glow plug 1 to try and get rid of this.
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      12-17-2018, 10:51 AM   #9
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Quote:
Originally Posted by Nel2014 View Post
Hi, I keep getting the fault code 'glow plug cylinder 1 control'. I have replaced the controller but still getting the error code. Was thinking of just replacing glow plug 1 to try and get rid of this.
The fault code I am getting is

"4222/not present - DDE Glow Plug cylinder 2, activation"

no idea what it means
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      12-17-2018, 11:37 AM   #10
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Quote:
Originally Posted by E60525d View Post
Glow plug faults do not affect regen. My car was doing regens for over 6 months whilst I had several glow plug fault codes.
Sorry to clarify my controller went down so all 6 plugs showed a fault. Definitely didn't regen though. Some people have reported that just one fault in the DDE will stop regen so who knows. But in answer to the original question they are not just used from cold.
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      12-17-2018, 11:58 AM   #11
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Quote:
Originally Posted by lloydie View Post
Sorry to clarify my controller went down so all 6 plugs showed a fault. Definitely didn't regen though. Some people have reported that just one fault in the DDE will stop regen so who knows. But in answer to the original question they are not just used from cold.
Fair enough. Could be different stategy on different engines. On my N57 it was definetly doing regens as i checked it regularly with ISTA.
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      12-17-2018, 01:34 PM   #12
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My 335d still regens and has a glow plug error. It would not regen with the controller error tho
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      12-17-2018, 04:06 PM   #13
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so are we are saying that the glow plugs are needed for cold starting, (obvious - as with all diesel engines), but also the Glow Plug controller is part of the regen system and if maybe one or two glow plugs are down, (with the 6 cyl BM engine), the system will still regen provided the Controller is working correctly, (and provided the engine reaches the required operating temperature, i.e the thermostat is working correctly)
and
if there is a fault with the Controller the system will not regen

Last edited by Bluewater335D; 12-17-2018 at 04:19 PM..
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      12-18-2018, 05:49 AM   #14
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Yes that is my experience.
The only faults I had in the DDE were for plugs 1-6, which pointed at a controller (there is no code for the controller itself). No regen took place. Temps were good. Replaced controller, regen occurred the very next time I took it out.
It suggests that there is a maximum number of glow plugs that can be faulty before regen doesn't occur, or maybe as others have said a maximum number of faults in the DDE that prevents regen?
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