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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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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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

BMW has been using electronically controlled automatic transmissions in most models since the late '80s. These transmission systems employ a transmission control unit which controls electrical solenoids to manipulate the various control and shift valves and functions in the transmission valve-body. When the transmission control unit detects a problem that it "thinks" could be damaging to the transmission or engine, it goes into a fail-safe or "limp" mode. In this mode, the transmission will function in reverse normally, but in forward it will operate in only one gear (whether you have the shifter in D, or any of the lower gears). This will typically be 3rd or 4th gear, depending on the model. It will start in this gear and stay in this gear with no shifting. You would experience this as sluggish acceleration and higher than normal engine speed at about 40-mph and above.
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.
Earlier models do not employ fault codes and must be diagnosed manually. Late models do employ fault codes and a diagnostic/scan machine can be used to check and read the faults to assist in diagnostics. Note that this is not your common OBD-II engine management fault code tool. This is what A BMW dealer or a properly equipped independent shop would have for full vehicle system diagnostics and coding operations.

Jun 15, 2017 | BMW Cars & Trucks

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Problem diagnosis states 5th gear incorrect ratio for BMW X5 2003 what could be the problem

there may be a problem with the TCM unit or other sensor in the transmission
find an accredited transmission shop for a proper diagnosis.
It will not need a new transmission just replacement of faulty sensors.

May 13, 2014 | 2003 BMW X5

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It sounds like you are either in "winter" mode, or "failsafe mode". If it's winter mode, you should see the word "winter" somewhere on the display. On my 1998 Saab 900, the winter button is on the console. Pushing it turns the winter mode on and off. If it's in failsafe mode, you're going to need to take it to a GM dealer.

May 11, 2014 | 2003 Saab 9-3

1 Answer

Transmission failsafe mode

code po720 refers to output shaft speed sensor (OSS) --circuit malfunction ===causes---wiring---OSS sensor---TCM
code po771 refers to shift solenoid (SS0 E --performance stuck off===causes --wiring ---shift solenoid.

Feb 22, 2014 | 2003 BMW X5 4.4i

2 Answers

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 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 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.

Feb 20, 2010 | 2000 Hyundai Elantra

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Transmission problem, i think?

sounds like a sensor issue on your transmission. it is going into failsafe mode for some reason because the computer is not receiving an input that it should. there may be a loose wiring connection on the tranny. the first thing i would do is check for loose wires. after that you may need one of several sensors. if the car works fine when this message does not appear i would not think the transmission itself is bad.

May 30, 2009 | 2006 Land Rover Range Rover

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2003 Nissan Maxima Transmission Issue

for the 2003 it sounds like maybe the tranny cooler is getting clogged.

Mar 21, 2009 | 2000 Nissan Maxima

1 Answer

1995 cutlass supreme transmission

It physically will fit and bolt up,but there are many different ratio,and drive and driven sprocket tooth counts,different final drive ratios,all monitored by the computer with electronic speed sensors.If the trans from the 95 has a different ratio than the 93,the computer will set gear ratio error codes,and possibly put the trans in a failsafe mode,stuck in 2nd or 3rd gear.On the transmission case,down by where the passenger side axle would go in,is a thin metallic tag,maybe 2"x 3",and it has bar codes,and also a series of numbers and letters.The numbers and letters,large cap,are the final drive gear ratio code.They should match on the two transmissions in question.

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1 Answer

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after replacing both fuel level senders for fuel gauge, on board computer shows trans failsafe appears from time to time. Can anyone help?

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