[TorqueAddict]

I have the following codes on my car:

49A5
4A74
4A79

My research says that it is my glow plug controller. Can anyone post any description for the above stated codes, or any related SIB(s)?

Thanks!

[CO335D]

I had those exact same codes recently. Replaced the glow plug controller and reset the codes, and all is well. I can look up the details of the codes again once I get home, but replacing the controller should take care of those. I had all 3 of those exact codes.

[GreekboyD]

Here you go:

Link

[Len_Beach]

I had 49A5 and 4A79 on my 330d LCI.

I bought 6 new glow plugs and a new controller. When tested; the controller was fine and my issues were caused by failed glow plugs.

[TorqueAddict]

Thanks for your input guys.

[Mik325tds]

The preheating control unit seems to be a common problem in the 335d. Mine was bad when I bought the car with 97k miles. It's a bitch to get to without removing the intake but possible. I found it the hardest to disconnect the connector X2402 (see picture). Curved needle pliers finally did the job.

My code was U0106: "no messages received - preheating control unit GSG".

[eurojulien]

Mine just got replaced under CPO.. code was 4a2e (cyl #5 glowplug). They first replaced the glowplug but the fault came back so they did the module

[kiel_dafo_kenyg_as]

Glowplugs are cheap. I bought BERU for $10 / pc.
If you change the plugs frequently they will come out flawless. If you wait too long they may get more and more stuck. If a plug snaps you're forked.
While you're at it always change plugs AND relay. Clean and lube the chambers in the engine head. I used a gun brush and ceramic paste.

[TorqueAddict]

Replaced the glow plug controller, all 6 glow plugs, and the coolant temp sensor. All good now. BTW, what is the average coolant temperature of the cars who are running the deletes? Mine stays in between 65-70C. I feel like the engine is running cooler than it should.

[kiel_dafo_kenyg_as]

Originally Posted by TorqueAddict

what is the average coolant temperature of the cars who are running the deletes? Mine stays in between 65-70C

Change both, main thermostat and egr thermostat. At least one of them is toast and the other will die next.
Temperature should reach 90° C after a few (like 10) minutes of driving and stay there

[BB_cuda]

I run 82C.