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Old 12-11-2012, 07:16 PM
robertobaggio20 robertobaggio20 is offline
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Join Date: Oct 2009
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Quote:
Originally Posted by BMR_LVR View Post
My previous 92 E34 did the same thing at 256K miles. It was not long thereafter before reverse went out completely. I hope yours is something less serious.
It could be the solenoid that controls the reverse gear shift that is busted. New solenoids run you about $50-$100. The service to fix it would be related to removing the valve body and replacing the solenoid, which is similar to replacing a large battery. I believe bmw dis should be able to read if the individual solenoids are alive or dead. Not sure about the stomp test....in fact, from what you say earlier, the stomp test has no tranny codes.

I am of course speculating here, but it does not seem to be a gear or clutch defect if the reverse gear goes out suddenly. The solenoid concerned has to redirect oil pressure appropriately to shift gears (loosely speaking) when required. If the solenoid is dead or defective, you either experience a hard shift or no shift.

Another possibility is a defective transmission range switch. That would be the low hanging fruit. However, that is usually not the case, but its worth checking anyway, just in case..

OP....please delete all of your error codes, preferably by unclamping the ecu for a few minutes. If that doesn't fix the problem (and since you've got enough oil), you probably do have to visit a tranny specialist.



rgds,
Roberto
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