4.8 electrical gremlins? Or alternator ?

[Hack213]

Hey guys I waited a week before posting hoping things would dry.

A week ago I had the valley pan , cooling pipe , hoses and thermostat replaced ,

I did have a lot of gunk under the intake manifold like an idiot took it to the Carwash and used high pressure hose too clean the valley pan.

Fast forward 10 minutes later and trans malfunction cluster turning on and off etc

After driving it for 20 mins it went back to normal after driving back home from the Carwash the upper radiator hose came loose and I got a low coolant light . Took an Uber to autozone and bought more coolant refilled the car and as soon I turn on the car electronic malfunction came on trans malfunction and everything else brake light etc

Hazards would not work in cluster but would illuminate outside .

Fast forward to now everything cleared up but now under heavy acceleration I'm getting all the lights again and limp mode and No communication from transmission here are my rheingold codes ..

Did the alternator go to shit? While the hose right ontop came loose prior to me ubering to autozone ? Im stumped I looked at the connections near the trans everything is dry . Same for the engine bay

I can clear the codes and they will come back after heavy acceleration

Tested the battery it's fine removed negative cable under trunk and alternator is charging fine .



2008 BMW X5 4.8 103,000 miles

[robnitro]

At idle, check the voltage at the jump terminals under the hood. It should be at least 13.6v.
Load up accessories like defroster, headlights, vent fan... See if it holds that voltage (a quick dip is OK).

[Hack213]

Originally Posted by robnitro

At idle, check the voltage at the jump terminals under the hood. It should be at least 13.6v.
Load up accessories like defroster, headlights, vent fan... See if it holds that voltage (a quick dip is OK).

Thank you for replying I've been stressed I will check that today and get back

This pocket scanner I have can read voltage and other data streams is it ok to read it through there or volt meter thx

[Hack213]

Hey guys doing more research I'm aiming on replacing the voltage regulator . What is the best option can I get a part number ?

Is this one correct

[url=https://ibb.co/rmJLrkQ]

[Hack213]

Quick update alternator under load lights and ac windshield wiper hazards working fine no problems no lights . Only under heavy throttle

[Hack213]

Redid harness no change . Does the tcm need to be programmed if I purchased a used one same model and year? Any ideas guys

[Thecastle]

Have you checked the battery?

Usually when I see random errors if the alternator is fine then it’s the battery.

On my x5 my alternator would die about every 30-40k miles....

[Hack213]

DONE FIXED . IDNY found traces of water under hood near egs module under cabin filter .

Cleaned corrosion , cleaned

Reprogrammed/recoded egs
Tcm

Back to normal !