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Old 03-22-2019, 01:31 AM   #1
325CiPR
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! Next to my Drive symbol.

My car was running fine. One day I change the bulbs for my headlights then the next day I take a 3 hour roadtrip and almost reaching my destination my car changes into gear hard and then first gear is reeeeeeaaaaaallyyyy weak, once I get into 2nd gear it drives normal. I look at the dash and theres an exclamation point.

The thing is I've been in a hotel for 2 days and its time to go back. Is it safe to drive with the "limp" to get back home since I have no other way back? A tow would be a fortune!

Was looking into the MAF sensor that a lot of these other forum posts talk about and ordered it. I also know the other day I ran the codes on it and it said there was issues with the CAM shaft position sensor. Ordered both! I hope its not an actual transmission problem!

Any thoughts on what the common issues are with these?
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Old 03-22-2019, 10:03 AM   #2
armenh7
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Try driving in manual mode. You should be able to make it home. You really shouldn't throw parts at it but rather scan the codes and see what they are
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Old 03-23-2019, 05:24 AM   #3
markusmarkus
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The first step in diagnosing a problem is to scan the engine computer (DME) and the automatic transmission computer (EGS) for codes. These cars are rolling computers. So, whacky throngs happen when you mess with the electrical system.

Google BMW E46 hidden OBC functions. Test #9 will tell you the voltage as seen by the DME.
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Old 03-30-2019, 07:49 PM   #4
325CiPR
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What type of scanner do I need? Can I roll up to autozone and ask for them to let me use theirs? I changed out the cam position sensors and the MAF because it was giving me those codes on the regular computers?
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Old 03-30-2019, 10:54 PM   #5
Jagdtiger
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I have ran this down on my g/f's car to a selector lever sensor not wanting to operate properly. One thing that seems to work for me is to put the car in position 2 and just cycle back and forth through the gear selections. I hav e read that the contacts inside the selector lever sensor can corrode and cycling through the gear selections can clean the contacts.
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Old 03-30-2019, 11:16 PM   #6
VpointVick
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How old is the battery?

That trans module is often the first to have problems with a low voltage condition, that's what mine did when it was replacement time.
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Old 03-31-2019, 12:01 AM   #7
Bidno
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Start by checking your battery; weak batteries can cause all sort of odd electrical gremlins. Next try disconnecting the MAF to see if the car runs better. Jfoj noted maf issues can cause transmission failsafe. In failsafe transmission only runs in third and four gears (i.e. little acceleration from stops). So yeah, tank up and pit stop first i.e. no stops, no rush hour, keep you speed down and think you could get home. If it's not the battery or maf, you'll want to read engine and transmission codes. Most ODBC readers cannot read transmission module so see links in armenh7's sig for info on BMW tools that can (e.g. PA Soft). GL
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Old 03-31-2019, 09:03 PM   #8
Dogthebountyhunter
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Quote:
Originally Posted by Jagdtiger View Post
I have ran this down on my g/f's car to a selector lever sensor not wanting to operate properly. One thing that seems to work for me is to put the car in position 2 and just cycle back and forth through the gear selections. I hav e read that the contacts inside the selector lever sensor can corrode and cycling through the gear selections can clean the contacts.
Yes this is possible. Happened to me before and the gear icon would completely disappear and the car wouldn't know what gear it was in. Corrosion on the contacts from sitting was the culprit. I don't think this is ops problem unless his car sat for a long time
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