Rear Diff Warning

[AnthonyR]

Hi all, I had this come on last week and it disappeared. But yesterday it came on 3 times and had come on once today. It goes off once I restart the car....any ideas? Thanks

[cossie1]

I would say your diff oil temp sensor needs replacing.

[cossie1]

Part number for it is: 33107847469

[AnthonyR]

Originally Posted by cossie1

Part number for it is: 33107847469

Thanks mate

[cossie1]

No probs

[AnthonyR]

So Iv had the rear diffuser oil changed and temp sensor replaced on Saturday......the damn warning came up again in the morning :

[cossie1]

Damn

Was the oil that came out in good condition (not dark grey or black) ?

[AnthonyR]

Originally Posted by cossie1

Damn

Was the oil that came out in good condition (not dark grey or black) ?

Yea the oil was good, the garage told me that the diff looks fine as well, no leaks, or sweating around the diff :

[cossie1]

I guess that just leaves wiring that needs to be checked then ?

[AnthonyR]

Originally Posted by cossie1

I guess that just leaves wiring that needs to be checked then ?

Well when they changed the oil and sensor they checked the wiring as well....not sure what to try next

[cossie1]

Well the next step would be to look at the GHAS module.

What year is your car and what i-step version is on the car ?

[AnthonyR]

Originally Posted by cossie1

Well the next step would be to look at the GHAS module.

What year is your car and what i-step version is on the car ?

Mines a 64 reg, I also have gts flashed on the diff etc...

[cossie1]

Maybe try reading the codes with ISTA just incase BM3 isn't showing all the info.

It's possible that a wheel speed sensor is causing the error but BM3 is reporting it as oil temp (unlikely but stranger things have happened).

Failing that try getting the software updated, as that is the next cheapest option.

After that, I think your looking at replacing the GHAS module (as others in the past with the Diff lock warning, have had these replaced by BMW when under warranty, hence my suggestion of the software update, as it's likely the module wasn't really the problem but the software on it could have been).

[AnthonyR]

Originally Posted by cossie1

Maybe try reading the codes with ISTA just incase BM3 isn't showing all the info.

It's possible that a wheel speed sensor is causing the error but BM3 is reporting it as oil temp (unlikely but stranger things have happened).

Failing that try getting the software updated, as that is the next cheapest option.

After that, I think your looking at replacing the GHAS module (as others in the past with the Diff lock warning, have had these replaced by BMW when under warranty, hence my suggestion of the software update, as it's likely the module wasn't really the problem but the software on it could have been).

Thanks man all your help....a few things to look at....I have warranty on it through a third party, they approved my wheel speed sensor abt 18ms ago when one of the front ones went....however I think I might have to remove my spacers and reflash the stock tune inc the dct