![]() ![]() IF the Voltage with engine running (at any RPM) is greater than 15.0V (and probably more like 16.0V to 17.0V from your description) then your Voltage Regulator on the rear of your Alternator probably needs replacing, about $40 part & a couple hours to DIY if Bosch Alternator.ĭon't run engine with confirmed Overvoltage from Alternator or you risk damaging Electronic Control Modules, but you have to run to test. You can test System Voltage using any of the following, WITH the motor running, just at an idle:ģ) Scan Tool reading System Voltage Parameter via the OBD II Socket Ĥ) Hidden Menu 9.00, on your Instrument Cluster as you drive, per this link: Overvoltage, or Alternator Voltage Output > 15.0V can cause the "lightshow" you describe. 335i 2007 when I start the car every dash light comes on plus all the warning lights including the transmission light comes on, I can’t drive the car, then a couple hours later I start the car and it was driving fine until it happened again in the freeway. It's cold and dark, so I'll try to diagnose tomorrow Only extra symptom is my SOS system disabled warning light has been on for a few weeks (no iDrive) and I have no bluetooth, accessory input or usb outlet connection. ![]() Display freaked out for a few minutes then went back to normal. TPMS was showing a false low tire a couple days ago, then right before the car's temper tantrum, the TPMS disabled warning came on. Literally just bought a ring to propose to my girlfriend this Sat. Do you think that has something to do with it? I thought maybe the alternator was going bad but the car turns over just fine. ![]() I bought a new battery a month ago and didn't register it. The car starts with no issues whatsoever. It didn't affect drivability and I made it to the dealership just fine. The lights would turn off and then 10 seconds later it happened again, chiming and flashing like crazy. The speedo and tach would all drop down to zero and then reset to right where they should be. I was driving today to the BMW dealership to get my valve cover gasket replaced under the SULEV warranty when I get the BMW chime and all of the dashboard warning lights start flashing on and off. ![]()
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