Has to be warm but also maybe running? Running would take up fluid that is clinging to moving parts so I wouldn't presume it was over filled unless you are supposed to fill with it warm but off (fluid expands when warm).

Too busy to look up the procedure I just remember warm like 130f=54c

No longer leaks when running warm (40c IIRC).

Although, if the trans has been running and you ran through the gears, fluid shouldn't be coming out when it's cold either since the fluid expands when warm.

You don't mention it, but the car was running when you did this right? If you do this with the car off you will lose a lot of fluid.

But yes it's possible it's overfilled. Start the car and run through the gears (a few sec in each gear). Then put the car in P, and using a IR thermometer or a scan tool, monitor trans temp. Pull the full plug and either fill (or drain) until there is a very light amount of fluid coming out when the trans is at about 40c.

Don't pull the drain plug!!! :confused:

I think he meant pull the fill plug, and either fill (if under filled) or drain (if over filled) through the fill plug.

The X definitely needs to be started or you will lose a lot of fluid out of the fill plug. I only know the procedure for the ZF trans, but assume the GM trans is similar. Must be filled warm and running. Final fill between 40c and 50c. Again, that's ZF trans. Have no experience with the GM trans.

Yes that's what I meant!

Procedure for GM trans is the same (although the fluid is different)

Help with some terms please?

The EGS (electronic gear selector)is the blue trimed electronic box under the right side wiper blade area? Is it also called the TCM (transmission control module)?

I have a GM trans. Part number 7 518 603 (not sure the tag will be visible in this post) does this have a more common part description as appears in the manual?


Thanks




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Dreaded trans. Failsafe prog.
 

Ok, got to the heart of the matter. I pulled the engine electronics fuse carrier ( underneath the right side windshield wiper and in a box with the TCM and the ECM). The 30A fuse in slot four was burnt.

Fuse 4 is Automatic transmission control module (AGS) (A7000)
And the oxygen sensors heaters. (I got getting an Oxygen sensor code also so that is confirming.

Replaced the fuse…..no joy. I’m going to recheck it but on first check after startup, the fuse was good. Have drive 10 miles since so worth a check. (Drive reasonably normally)

Does this indicate a bad TCM or something short in the trans? Or something else entirely?

One other symptom. On startup the P of PRND is brightly lit but shortly goes to dim as the other 3 letters.

Thanks.


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Fixer was having a similar issue. His blew the fuse up front and it was because of his O2 sensor wiring shorting. He posted about it on the E53 forum. You should probably check your wiring as well.

He saw the post but good looking out


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Fuses blow from a short or power surge to keep the system from frying. If you replaced the fuse but still have the same errors then possibly tcm damaged, but I would check all related wiring first. If there's still a short somewhere you'll pop that fuse again. But if the wires burnt through you'll have an open circuit and no power to the tcm... if it's the tcm harness. If it's the o2 harness you'll just get an open in the o2 circuit.

Is the tranny shifting though? My tranny lights are dim too, but I've got full function. Sport and manual mode works just fine.