DREADED CHECK TRANSMISSION, GO TO DEALER

White tiger

Junior Member
Messages
68
My transmission issue which sent me on a wild goose chase ended up coming back as a failing wheel bearing. Loss or incorrect speed rotation signal from a sensor throws the gearbox and I turn clutch into panic.

Occasional transmission go to dealer errors that cleared on restart. Dropping out of gear on high gear changes (5/6) then not being able to select any gear.

None of the usual ABS/ASR/Traction lights till it finally went about a year later.

This was prior to my Sportsitalia days and another indie looked at my “gears with opposite shift” error and diagnosed the gearbox pots which turned out to be a red herring.

What I now do with anything gearbox related is connect diagnostics with live wheel speed sensor data, drive the car in a straight line and watch for one corner being behind or infront to the other three.

I also do this test with any car throwing wheel bearing ABS issues as we’ve been down this route before in changing the wrong bearing as SCAF will testify too.

Also a point to note, Maserati invert their wheel speed sensor codes left to right. What this means is that a generic code reader will say it’s front right when it’s actually front left and vice versa for the rear. Something to watch out for that has caught us out.

To confirm the corner from my tests above bearing in mind generic code readers inverted results, as a final check, on a ramp with the live wheel speed sensor data stream, spin the suspected corner and confirm it’s the correct side on diagnostics.

I really hope that sensors are the issue, as they are already on their way now. Otherwise it'll be just an expensive try to resolve the issue :0036:
 

Scaf

Member
Messages
6,512
I also do this test with any car throwing wheel bearing ABS issues as we’ve been down this route before in changing the wrong bearing as SCAF will testify too.

I remember that, but it had no impact on me as car came back all sorted regardless.
 

White tiger

Junior Member
Messages
68
Just to inform all...gear selection potentiometer changed and for now it looks issue has been resolved. Car runs great, gearshifts are superb.
When old sensor was dismounted I was able to feel just a little play on one of 2 potentiometers, while the new one did not have this play.
So let's hope it's resolved.
 

enjybenjy

Junior Member
Messages
84
Thought this might be relevant to this (and my earlier) thread:
After clearing my transmission fault code by way of coincidence (because I fixed the rear parking sensor), recently I got the same transmission error again, after the car was running like a champ.
I thought I'd try an experiment so I gained access to the parking sensor control box in the boot, unplug it, start the car, stop the car. Reconnect, start the car....the transmission fault clears as well.

Drives perfectly normal again.