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BMW Diesel Owners / Enthusiasts
Do you own a diesel powered BMW? Maybe a 335d or a BMW x35d? Come and talk about what makes your car great!

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  #1  
Old 05-28-2014, 01:34 PM
duke5150 duke5150 is offline
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Mein Auto: 2011 335d
2011 335d Service Engine Soon Light

64,000 miles and my Service Engine Soon light comes on. Stays on for several days then goes off for one day then back on. Took to Dealer who said I need a new "Pre-Heating Control Module" at an installed cost of $750. And, that this is NOT covered by California or Federal Pollution Warranty.

What is "pre-heating control module" and should it be covered under Pollution Warranty?

Please advise?
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  #2  
Old 05-28-2014, 01:40 PM
GreekboyD GreekboyD is offline
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Sounds like the glow plug module. They'll most likely change all 6 glow plugs as well. Did you have prior symptoms like rough idle, decreased fuel mileage, etc?

This should be covered under warranty, assuming that you have it.

Last edited by GreekboyD; 05-28-2014 at 01:41 PM.
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  #3  
Old 05-28-2014, 01:50 PM
GreekboyD GreekboyD is offline
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Some more info:

Quote:
RELATED TSB ON GLOW PLUGS:




SI B13 12 10
Fuel Systems
January 2011
Technical Service
This Service Information bulletin supersedes SI B13 12 10 dated December 2010.

[NEW] designates changes to this revision

SUBJECT
Various Glow Plug and Glow Plug Control Unit Faults Stored in DDE

MODEL
E90, E70 with M57Y engines

[NEW] SITUATION
The vehicle may exhibit a long crank or rough idle in colder ambient temperatures. The Service Engine Soon lamp is on.

One or more of the following faults can be stored in the DDE:

^ 4A1F combustion preheating control unit output stage cylinder 1 faulty
^ 4A2F combustion preheating control unit output stage cylinder 2 faulty
^ 4A3F combustion preheating control unit output stage cylinder 3 faulty
^ 4A4F combustion preheating control unit output stage cylinder 4 faulty
^ 4A5F combustion preheating control unit output stage cylinder 5 faulty
^ 4A6F combustion preheating control unit output stage cylinder 6 faulty
^ 494A combustion preheating control unit, diagnostic feedback

CAUSE

Internal fault with the glow plug control unit

CORRECTION

If one or more of the above faults are stored, replace the glow plug control unit and all six glow plugs. Refer to Repair Instructions REP12 21 520 (glow plug control unit) and REP12 23 505 (glow plugs) for component replacement.



PARTS INFORMATION



WARRANTY INFORMATION

2014 ALLDATA LLC. All rights reserved. Terms and Conditions

Last edited by GreekboyD; 05-28-2014 at 01:51 PM.
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  #4  
Old 05-28-2014, 02:21 PM
duke5150 duke5150 is offline
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Would this TSB for Glow Plugs be covered under the california and federal pollution warranty? Need to know as I do not have extended coverage.
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  #5  
Old 05-28-2014, 05:19 PM
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Flyingman Flyingman is offline
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I doubt it would have any affect on emissions except at initial start up.

Glow plugs just pre-heat the combustion chamber and allow for a quicker start, or a "start" in really cold weather.

Definitely don't see why it would affect your MPG. They are just on for a few seconds if that, then serve no purpose.

In the old days one would have to push in the glow plug button for about 30 seconds, then crank it over.

Here is South Florida they are like tats on a bull!
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  #6  
Old 05-28-2014, 05:31 PM
GreekboyD GreekboyD is offline
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Quote:
Originally Posted by duke5150 View Post
Would this TSB for Glow Plugs be covered under the california and federal pollution warranty? Need to know as I do not have extended coverage.
I don't see why they'd be covered.
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  #7  
Old 05-28-2014, 09:37 PM
anE934fun anE934fun is offline
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Quote:
Originally Posted by Flyingman View Post
I doubt it would have any affect on emissions except at initial start up.

Glow plugs just pre-heat the combustion chamber and allow for a quicker start, or a "start" in really cold weather.

Definitely don't see why it would affect your MPG. They are just on for a few seconds if that, then serve no purpose.

In the old days one would have to push in the glow plug button for about 30 seconds, then crank it over.

Here is South Florida they are like tats on a bull!
Or, if you owned a first gen VW Diesel Rabbit, you turned the ignition switch to glow (pre-start), waited for a light on the dash to go out, then pulled an injection advance knob all the way out and finally cranked the engine. When temps were below 50F, the combination of pre-heating with injection timing advance made a difference.
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  #8  
Old 05-30-2014, 11:44 AM
duke5150 duke5150 is offline
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Got the car back from the dealer repaired.
Fault code was: 4A74.
Replaced pre-heating controller.
Not under pollution warranty.
Cost $750.
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  #9  
Old 05-30-2014, 11:54 AM
GreekboyD GreekboyD is offline
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Quote:
Originally Posted by duke5150 View Post
Got the car back from the dealer repaired.
Fault code was: 4A74.
Replaced pre-heating controller.
Not under pollution warranty.
Cost $750.
Did they also replace all 6 of the glow plugs?
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  #10  
Old 05-30-2014, 12:03 PM
duke5150 duke5150 is offline
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Nope, only the pre heating controller.
SES light is off.
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  #11  
Old 05-30-2014, 12:47 PM
lpcapital lpcapital is offline
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Quote:
Originally Posted by Flyingman View Post
I doubt it would have any affect on emissions except at initial start up.
That is only partially correct. They are of course used in the initial startup if outside temperature is below a certain point, but they are also activated under certain driving conditions up to the time the coolant temperature gets to 75 degrees: it is an attempt to improve combustion and reduce soot production during engine startup.

Here's a quote from the BMW training on the diesel found under the glow plug section: "Partial load heating can occur at coolant temperatures below 75C after starting the engine. Actuation of the heater plugs depends on the engine speed and load, thus improving the exhaust gas characteristics."

This is actually something to keep in mind: in the event you find multiple failing glow plugs, maybe in combination with a DPF failing to regenerate, the underlying reason is a failed thermostat. This results in engine temperatures dropping below 75 deg which cascades to overuse of the glow plugs and failure to carry out proper DPF regeneration.

I just went through this on my dad's 325d (EU car): on his care the issue was even worse since it also had a thermostat on the EGR cooler that fails stuck open too. Mileage was terrible, 5 glow plugs died, DPF clogged up and we couldn't figure out why. After realizing this on his car, I check my 35d (US car with only the main engine block thermostat) and at highway speed engine temp would stay in the high 70s - low 80s and than rise in the upper 80s during city drive. The thermostat is rated at 88. I went ahead and replaced the thermostat and the temperature is now rock solid between 88 and 91 under pretty much any condition. For the record the car is a 2009 with about 70k miles when I changed it.

If you don't have easy access to a diagnostic tool, a quick YouTube search will prompt you video on how to access the hidden menu in the instrument cluster to check coolant temperature.

I thought I'd add this since we're talking glow-plugs...
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Last edited by lpcapital; 05-30-2014 at 12:49 PM.
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  #12  
Old 05-30-2014, 02:14 PM
GreekboyD GreekboyD is offline
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Quote:
Originally Posted by duke5150 View Post
Nope, only the pre heating controller.
SES light is off.
Interesting. I figured that the glow plugs would have to be changed as well.
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  #13  
Old 06-25-2014, 10:31 AM
BU335d BU335d is offline
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Mein Auto: 2010 BMW 335d
I recently took in my 2010 BMW 335d to my local indy. repair shop when my SES light came on. They found that one of my glow plugs went out and with 80k miles recommended replacing all 6 of them. I went ahead and did that but after they replaced them, they said the SES light is still on meaning the glow plug module is out.

Does that make sense? And did I make the right decision to replace them all at once instead of having to pay for labor each time to replace one of them?

Also, could this be the cause of my MPG going down since the SES light came on?

Thanks!
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  #14  
Old 06-25-2014, 10:36 AM
duke5150 duke5150 is offline
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I only had the warm up module replaced by the dealer. Did not replace any glow plugs. Cost was $750. Fixed the SES light problem.
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