[timsn54]

Hey guys,

My 08 335i has been throwing these shadow codes with no CEL:

2e83: Electrical Cooling Pump, Low-power mode
2e85: Electrical Cooling Pump, Communication
2e8b: Intelligent Battery Sensor, Signal

The car does not overheat at all and ive been driving it very spirited. The water pump seems like its working fine and was replaced only about 22k miles ago. I checked the battery compartment to see if the IBS cable was unplugged but everything was plugged in and looked snug. I searched around and saw someone with similar problems changed out his Alternator Voltage Regulator and it cleared the codes but just wanted to make sure before i throw parts at it. All suggestions are appreciated. Thanks!

[timsn54]

bump

[rylanej]

Originally Posted by timsn54

Hey guys,

My 08 335i has been throwing these shadow codes with no CEL:

2e83: Electrical Cooling Pump, Low-power mode
2e85: Electrical Cooling Pump, Communication
2e8b: Intelligent Battery Sensor, Signal

The car does not overheat at all and ive been driving it very spirited. The water pump seems like its working fine and was replaced only about 22k miles ago. I checked the battery compartment to see if the IBS cable was unplugged but everything was plugged in and looked snug. I searched around and saw someone with similar problems changed out his Alternator Voltage Regulator and it cleared the codes but just wanted to make sure before i throw parts at it. All suggestions are appreciated. Thanks!

The IBS could be faulty even if it's snug. Most likely either that or the voltage regulator as you said, the voltage regulator is like $40 and pretty easy to put in so I'd go for it. Any other issues? Limp mode? Electrical issues? You can also check your voltage with a voltage reader or through the second menu which you can google how to do.

[timsn54]

Originally Posted by rylanej

The IBS could be faulty even if it's snug. Most likely either that or the voltage regulator as you said, the voltage regulator is like $40 and pretty easy to put in so I'd go for it. Any other issues? Limp mode? Electrical issues? You can also check your voltage with a voltage reader or through the second menu which you can google how to do.

No other issues at all. I ordered the voltage regulator and will try that if it doesn't work you think i should just try a new ibs? Thanks!

[rylanej]

Originally Posted by timsn54

No other issues at all. I ordered the voltage regulator and will try that if it doesn't work you think i should just try a new ibs? Thanks!

Yeah it has IBS as one of the codes and says communication for the others and since the IBS is what determines where the power is gonna go so it would make sense although in most cases I've seen it's throwing a lot more codes when it faults. Only other things I can think of would be battery, grounding cable, or a a faulty wire from getting chewed or melted. But who knows electrical issues can be tricky and frustrating.

[timsn54]

Originally Posted by rylanej

Yeah it has IBS as one of the codes and says communication for the others and since the IBS is what determines where the power is gonna go so it would make sense although in most cases I've seen it's throwing a lot more codes when it faults. Only other things I can think of would be battery, grounding cable, or a a faulty wire from getting chewed or melted. But who knows electrical issues can be tricky and frustrating.

so i changed the voltage regulator and now im getting 2e97 - generator and a charging malfunction check control message, any ideas?

[timsn54]

Changed the voltage regulator now getting 2e97 - generator and a charging malfunction message in the check control messages. Water pump and IBS codes are no longer showing... any ideas? Alternator and battery are both a year old

[rylanej]

Originally Posted by timsn54

Changed the voltage regulator now getting 2e97 - generator and a charging malfunction message in the check control messages. Water pump and IBS codes are no longer showing... any ideas? Alternator and battery are both a year old

Probably the IBS if it hasn't been changed. Even if the code for IBS isn't showing it's still probable that could be the cause. Also sounds like it could be the alternator but if it's only a year old probably not and I'd say more likely to be IBS

[zomski101]

Originally Posted by timsn54

Changed the voltage regulator now getting 2e97 - generator and a charging malfunction message in the check control messages. Water pump and IBS codes are no longer showing... any ideas? Alternator and battery are both a year old

Make sure you purchased the correct replacement for your voltage regulator.
F00M346089

[timsn54]

Originally Posted by rylanej

Probably the IBS if it hasn't been changed. Even if the code for IBS isn't showing it's still probable that could be the cause. Also sounds like it could be the alternator but if it's only a year old probably not and I'd say more likely to be IBS

While the alternator is only a year old its a duralast brand alternator that the previous owner had installed, you think this can be causing it? with the old voltage regulator i would only get shadow codes with no CEL, but now a red battery is popping up in the dash and a charging malfunction error.

[timsn54]

Originally Posted by zomski101

Make sure you purchased the correct replacement for your voltage regulator.
F00M346089

It is the correct regulator part# F00M346089 ordered from FCP

[rylanej]

Originally Posted by timsn54

While the alternator is only a year old its a duralast brand alternator that the previous owner had installed, you think this can be causing it? with the old voltage regulator i would only get shadow codes with no CEL, but now a red battery is popping up in the dash and a charging malfunction error.

I would always go with OEM for alternators but even with aftermarket it should last more than a year. Did u replace it with the OEM voltage regulator meant for the Bosch alternator or one made for the duralast?

[rylanej]

Originally Posted by timsn54

It is the correct regulator part# F00M346089 ordered from FCP

For OEM yeah but I don't think that would work with the after market but not 100% sure.

[timsn54]

Originally Posted by rylanej

For OEM yeah but I don't think that would work with the after market but not 100% sure.

i replaced it with the Bosch voltage regulator.. at this point im ready to just replace the alternator with a Bosch one hoping that will fix the issue

[timsn54]

Tried the car with IBS unplugged still getting 2e97 and charging malfunction with red battery symbol, tried it with the alternator unplugged and got no codes... should i just replace the alternator?

[mang.vang]

I've read of people having codes from not using bosch alternators. I would see if you can get a used one from a parts car and install the voltage regulator on to that.

[timsn54]

Ended up getting a new Bosch alternator from FCP, Solved all my issues! Never buy any other alternator