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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1667
Experience:  GM Grand Master Technician 2007. 14 year experience.
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I have a 2000 gmc sierra 1500 2wd. Transmission went belly

Customer Question

I have a 2000 gmc sierra 1500 2wd. Transmission went belly up I replaced it with a used transmission from junk yard. It matched up perfectly and shifts great but it throwing all kinds of transmission codes. Does ECM need reprograming or transmission wont work.
Submitted: 1 year ago.
Category: GMC
Customer: replied 1 year ago.
its a 2001
Expert:  Gary replied 1 year ago.

I am sorry for the long wait

can you tell me the code numbers ?

how does it shift ?

Customer: replied 1 year ago.
A little hard from 1st to 2nd but not bad. It will be tomarrow before I can get actual code numbers.
Expert:  Gary replied 1 year ago.

if we know the code numbers we will know exactly which direction to take

does it shift 3rd and into 4th ?

Customer: replied 1 year ago.
Expert:  Gary replied 1 year ago.

ok

let me know the code numbers setting tomorrow and then we will know exactly which way to go with this issue

Customer: replied 1 year ago.
thanks talk to u tomarrow
Expert:  Gary replied 1 year ago.

sounds good

Customer: replied 1 year ago.
po713,po740,po748,po753,po758,po785,po1860
Expert:  Gary replied 1 year ago.

are you sure the fuse called IGN0 in the fuse in the fuse box is good ?

if that fuse is good does it show 12 volts on both sides of the fuse testing it in place through the little openings in the tops of the fuse ?

Customer: replied 1 year ago.
Checked all fuses nothing blown. Sunday I'm going to put it back up on stands and inspect wire harness. Do you have any more ideas.
Expert:  Gary replied 1 year ago.

are you sure the big round connector is plugged in at the passenger side front of the transmission ?

can you see with the key ON if that fuse shows 12 volts ?

if it does then with the key ON see if the pink wire at the transmission big connector shows 12 volts