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Check Engine Light,tranny Codes

driscoja

By driscoja
in Ask A GM Technician

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driscoja New Member

driscoja

Posted
Posted

Greetings, I've got a 2001 HD 2500 with about 59k miles on it. The other day I had to back up to make way for a plow coming down my narrow road. The check engine light came on a few seconds after I put it in reverse. The codes were P0700,P1713 and P0847.The truck is driveable but goes into gear harshly and seems like I've got only three forward gears. I checked and added fluid,it was a little low,changed the spin on filter and looked at the wiring underneath. I had been driving through deep snow that morning and possibly disturbed the electronic connectors to the tranny. Since it was only about 11 degrees when I had the truck on the ramps I didn't dare take the connectors off to clean and reseat them for fear of breaking them. I reset the codes and the truck drove fine till I put it in reverse again. I'll do the connectors when it warms up a little bit. Any other ideas before I go to the dealer? The truck has the 8.1L engine and allison tranny. Thanks

  • 2 years later...
C@TCH Enthusiast

C@TCH

Posted
Posted

I had the same thing happen to me last night.

Hard shifting "N" to "D" & "N" to "R"

PRND321 acting funny

Seems to not shift out of first

Did you figure out what your problem is, I dont want to spend

a fortune fixing this, I only got the truck 2 weeks ago.

Nytemare Senior Enthusiast

Nytemare

Posted
Posted

All 3 of those codes seem to not have anything to do with each other.

 

P1713 is saying you have a problem with the temp sensor

P0847 is pressure sensor

and P0700 is just the generic trans control system

I would say you did pull a plug, since all these wires are going in through the large round connector.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

+1 ,you got probs,that round plug Aiden is referring to is very difficult to unplug,you have no range codes that would indicate the connector came unpluged at the NSBU (neutral start back up) switch,which is very common in mud/snow

 

 

take it in

 

keep in touch with aht they found plse

C@TCH Enthusiast

C@TCH

Posted
Posted

It was the NSBU (neutral start back up) switch, apperently very common problem with these. Mechanic at the dealer told me last winter they were replacing roughly 1 a day.

Got a new switch at dealer for $200 they had a $70 one like some of the parts stores did. But I opted to get the one GM recomends, everything works fine now.

Only problem to change it, is to remove the 7 wire connector it was almost glued in and had to break the switch around it to get it off.

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