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Car Forum / BMW Cars / March 20082000 740i Transmission/electrical problem
Hello, I have a 2000 740i The other day this started happening. The transmission seems to lock in 2nd gear and the message I am getting on the computer is "transmission failsafe program." In addition to that the Temp Guage goes completly up and the speedometer and tach won't work at all. The check engine light comes on. The local mechanic without doing much diagnostics thinks this is some kind of electrical problem rather than transmission problem. Any thoughts before I take it to the BMW Dealer???? Jeff > Hello, > I have a 2000 740i > The other day this started happening. > The transmission seems to lock in 2nd gear and the message I am getting > on the computer is "transmission failsafe program." > In addition to that the Temp Guage goes completly up and the speedometer > and tach won't work at all. > The check engine light comes on. > The local mechanic without doing much diagnostics thinks this is some > kind of electrical problem rather than transmission problem. Yup. If the gearbox electronics loses volts - or they are low - it goes into limp home mode where only one forward gear works. > Any thoughts before I take it to the BMW Dealer???? You might do better with an auto electrician. > Jeff  Signature*A cubicle is just a padded cell without a door. Dave Plowman dave@davenoise.co.uk London SW To e-mail, change noise into sound. > Hello, > [quoted text clipped - 4 lines] > The transmission seems to lock in 2nd gear and the message I am getting on > the computer is "transmission failsafe program." 3rd usually > In addition to that the Temp Guage goes completly up and the speedometer > and tach won't work at all. [quoted text clipped - 7 lines] > > Jeff Assuming you haven't really boiled it over then low battery is the most common cause of silly electronics. > Assuming you haven't really boiled it over then low battery is the most > common cause of silly electronics. I'd be very surprised if that took out the speedo. Signature*Young at heart -- slightly older in other places Dave Plowman dave@davenoise.co.uk London SW To e-mail, change noise into sound. >I have a 2000 740i > [quoted text clipped - 12 lines] > >Any thoughts before I take it to the BMW Dealer???? 1. When a lot of seemingly-unrelated things happen, it is often because they share the same ground connection and that ground is bad or noisy. 2. The electrical diagram for the car will help a lot. Look for where the transmission control system and the speedometer and tach stuff come together. What do they share in common? 3. Electrical work on a 740i is sheer torture and I would not wish it on my worst enemy. --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." > In article <SV0xj.4779$R_5.4460@trnddc08>, Jeff Thanks for the input The problem turned out...ready for this? The ABS Module was bad. $1,400 later it's now working fine. Thanks for your help. Jeff > <yearight@yaherrr.com> wrote: >>I have a 2000 740i [quoted text clipped - 11 lines] >>The local mechanic without doing much diagnostics thinks this is some >>kind of electrical problem rather than transmission problem. What was the OBD II code? And, I hope they gave flowers after bending you over like that. >> In article <SV0xj.4779$R_5.4460@trnddc08>, Jeff > Thanks for the input [quoted text clipped - 22 lines] >>>The local mechanic without doing much diagnostics thinks this is some >>>kind of electrical problem rather than transmission problem. |
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