Question about 2003 BMW M5

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I have a 2003 BMW Alpina B10 8S the transmission is stuck in the failsafe mode which keeps it in 3 gear. I think it's a sensor or transducer that may be involved, the dealer says I need to replace the transmission which I doubt. This problem started after I had the engine bay washed with a power washer. Any Suggistions?

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Hi,
Water is most likely sitting in the connector at the front of your transmission sump(oil pan) and shorting the pins together. Just unplug the connectors and blow out the water, use some contactcleaner spray on the terminals and blow dry with compressed air! If it's still stuck in limp home mode either go to the dealer to have it reset or try disconnecting the battery for 10-30 minutes and reconnect!

Posted on Oct 08, 2010

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Posted on Jan 02, 2017

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My BMW 2002 starts out good in morning but when it gets warm or hot my transmission failsafe light comes on what can I do


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If you must drive the vehicle when the transmission is in the fail-safe mode, accelerate gently and keep the road speed lower than full highway speed.
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I have a hyundai elantra 2000 and I was told that the transmition was bad, my brother replaced the transmition and still doing the same thing as when we had the old one, when you turn on the car it makes...


I have 2002 elantra with similar problem. (but only takes 3 minutes to activate the problem) gets locked in 3rd gear, so have to start from a stop in 3rd, and revs really high when attempting freeway speed. also resets itself when you turn the ignition off, but will come back immediately (4 seconds, i think) as soon as you hit 30km/h the first time. (if you're seeing something slightly different read on anyway, some useful resources here)

So I'll start by saying I haven't fixed my problem yet, but found a lot of detail on it, which I'll share. First, check out http://www.hmaservice.com/ this is hyundai's site for service bulletins and other useful info. Locking into 3rd gear is one of 11 failsafe modes for the transmission, which they refer to as "electrical limp home mode" read the descriptions of the failsafe modes if yours is slightly different.
Second, get someone with an electronic read-out to check your DTCs (Diagnostic Trouble codes) I got mine done at AutoZone, who offers the service for free. Make sure you leave the car running, so the DTC doesn't clear itself, as it does each time you turn off the ignition. You'll probably get one of the four codes P0715, P0720, P0721 or P0722. 715 and 721 indicate a problem with the input speed sensor, which measures the rotation rate of the shaft going into the transmission, and the other two are codes for the output sensor, which reports the rate of rotation of the output shaft. In both cases, the problem can be that the sensor is blown or that the wiring leading up to it has a problem.

Now go back to hmaservice.com and look up TSB (technical service bulletin) 09-AT-016
it has a good picture of where to find the sensors on top of your transmission. there are some others that detail the failsafe modes (search on failsafe). you should have something to go on from here.

Unless your brother moved the sensor over from your old transmission to the new one, the fact that you still have the problem would suggest that the problem is in the wiring harness. Now, if it's a wiring problem, what would cause it to work OK for some time when the vehicle is cold? check to see if you have a puddle of coolant on the sensor when you start, and then look again after the problem kicks in. they put the sensors on top, where liquid can puddle, and beneath the coolant hoses where they often leak, especially after 8-9 years of use.

there is one catch, and that is if I read the info correctly, the 2000 elantra is a whole different series than the 2001-2009, and may be entirely different in codes, failsafes and sensor locations, but the three steps are still the best course for you.

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