New 47re in limp mode

[SCHMITTY]

I have 15 miles on this thing, brand new heat exchanger and front cooler, new electronics in the Trans. The tranny was running perfect except for the check ball cooler line was leaking and the batteries would not charge. So I changed the cooler line and tried diagnosing the electrical issues which involved some jumper wires off the back of the alternator . I popped the 120 amp alternator fuse at one point.

Anyhow I got the leak fixed and I narrowed the no charge issue down to the pcm. I took the truck for a test drive and and I could tell right away it was in limp mode. 2nd or 3rd gear starts and no overdrive.

I did the key trick where you turn it on and off a few times to retrieve stored codes. It showed an open circuit to the gov solenoid and the tranny oil temp sensor and a bad battery connection, and battery unhooked recently.


Is there any way to reset the tranny from limp mode without a scan tool ?

[Junk97]

Check the transmission relay under the hood see it it has power on the fused side if not check all fuses

[SCHMITTY]

I did last night. The pcm threw it into limp mode when I was screwing with the alternator. I made a jumper and the tranny worked. Now I'm going to finish wiring up the external regulator and drive it to an auto parts store and clear the code and see if I can remove the jumper wire.

Thanks

[blackcloudCTD95]

Not to derail this thread mines doing something similar. If I'm in od and I start slowing down for a red light I get down to 25ish mph and get back into it its still in 3rd gear and I have to drop it down to 2nd on the column. And if I'm cruising 35-38 mph it will up shift and down shift out of 3rd to 4th gear
No trans codes. Has a new gov press sol and sensor and OSS sensor

The TV cable is new and I've adjusted every witch way from Sunday is this a valve body problem

[SCHMITTY]

Did you test the Trans relay for 12 volts like 97 junk said ? Do you have a lock up switch? If not put a jumper like the 47re lock up switch jumper wire in place of the Trans relay under the hood like the directions show. I did the key cycle trouble code test and it showed the 37 code and that will put the Tranny in limp mode. This truck had charging issues before I rebuilt the Tranny, then I made matters worse hooking up jumper wire incorrectly. Now I have an external regulator I'm going to drive it orillies and see if I can clear the codes and put the relay back in

[blackcloudCTD95]

I do have the jumper wire in place of where the trans relay goes for the tc lock up switch.I haven't checked to see how many volts the koeo it has.

I did have batter cable problems on the drivers side positive terminal I fixed that but nothing really changed the alternator is newish I've already replaced that

[blackcloudCTD95]

Would a bad tp sensor cause this issue?

[Junk97]

It's hard to do this without a scan tool. If ur having charging issues you could be having pcm issues. If you had a scan tool look at gov pressure sitting still should be 0 make sure the temp sensor isn't reading some stupid temp and make sure you are getting an accurate reading from ur speed sensor. You can pull the main tranny connector make sure you have the key on 12 volts, then your 5 volt reference voltages.

[Junk97]

If you find ou the pcodes I might be able to help I more