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  #1  
Old 01-08-2023, 02:30 AM
kfm kfm is offline
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Trans failsafe problem -- crankshaft sensor error

Hi,

Sorry for this long post, but I figure to give a full descriptions...

We have a 2002 3.0 X5 (E53, M54) with 65K miles that recently developed a transmission shifting problem. We haven't driven the car for many months (had battery on a maintenance charger all these time) and had to get it smog tested for registration renew. The car was driving fine to the testing station (~10miles), but on the way back when slowing down for a red light, it made a big jolt when down shifting and the service engine light came on. The car was running kind of rough, not responding to gas peddle -- I didn't want to block the traffic so tried to keep the car moving. It cleared itself before the intersection. The service engine light also cleared itself, but the the message "trans failsafe mode" or something like that flashed for a few second on the text display in the instrument cluster, then went blank with the > < displayed and stayed that way.

I was able to keep driving the car, everything was fine except when down shifting. As the speed reduced and it down shifted, a big jolt will happened during the down shifts. I putted it into manual mode and found the jolt happens when shifting from 3rd to 2nd gear.

When I got home and read the OBD error code (after engine was shut off). It had a pending code P0335 "crankshaft position sensor A circuit malfunction".

It seems to me plausible that without crankshaft sensor, the engine and transmission computers will not be able to match engine speed for down shift, creating the jolt.

Has anyone else seen the same problem? And would you think replacing the crankshaft sensor is a good fix for the problem?

I see also other people reporting P0335 issue, but none was related to shifting, puzzling. I was also wondering if the smog test did something to it, but figured it is probably far fetched.

To get a better grasp of the problem, I followed advice and got a Foxwell NT530 BMW specific scanner. Now I have below error codes:

53 DME signal, crankshaft sensor,
F4 DME Segment timing, true running disturbed, and
96 EGS CAN engine speed.

Which seems consistent with the earlier "generic" error code and message. I research these codes on the internet, seems the crankshaft sensor error is the root cause of the problem. But everyone seems reporting engine problems associated with this error code, none with shifting. So I am puzzled.

Appreciate any ideas what I am dealing with here. Thanks!
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  #2  
Old 01-08-2023, 11:38 AM
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For sure start with the crank sensor code and go from there. It's most likely the sensor itself but don't forget to have a look at the wiring and connections.
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Old 01-11-2023, 01:47 AM
kfm kfm is offline
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Thanks 80stech. Have you seen crank sensor error associated with bad shifting?
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