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Tim's Auto Repair
Tim's Auto Repair, Mechanic
Category: Car
Satisfied Customers: 13187
Experience:  Have owned a repair shop for 25 yrs.
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gmc p/u 2500: I have a 1996 gmc 2500 5.7 liter...4l80e trans...only

Customer Question

I have a 1996 gmc 2500 5.7 liter...4l80e trans...only shifts from 1st to 2nd to 3rd only...will not go into O-drive at all....this is when cold.... once it warms up it will not shift out of 2nd...and will not downshift back to 1st when I stop...it will start off in 2nd gear..... I changed filter fluid and both 1st 2nd and 3rd o-d sol. in side trans.... also changed speed cens on out side trans.... what am I missing...
Submitted: 1 year ago.
Category: Car
Expert:  Tim's Auto Repair replied 1 year ago.

tims auto repair :

hi

tims auto repair :

do you ever also have problems with the instument cluster?

Customer:

no....everything else works fine..

tims auto repair :

ok

tims auto repair :

does the engine light stay on?if so,can you give me the computer codes?

Customer:

light does come on....but I get no codes ...so far...at auto zone....

tims auto repair :

it shows no codes?or will their scanner not scan it?

Customer:

I can stop an check again in the morning to see what happens.....it shows no code..

tims auto repair :

ok

tims auto repair :

yes,,do that,,just to make sure it doesnt show a code for a shift solenoid...

tims auto repair :

without the codes

tims auto repair :

i can give you my thoughts

Customer:

when I first had it scaned it said o2 ceni

tims auto repair :

i see

Customer:

sensor

tims auto repair :

that wouldnt do this

Customer:

I changed both on right side....yep...did not change trans problem...

tims auto repair :

well

tims auto repair :

i can give you my thoughts on your problem

Customer:

ok

tims auto repair :

sense we dont have any codes

tims auto repair :

i think you have one of two possible problems here

tims auto repair :

1-the ignition switch,not the key lock but the electrical switch itself

Customer:

ooh it has 304567 miles on trans.

tims auto repair :

these were known to go bad on this model and cause this transmission shift problem

Customer:

ok...anything else..??

tims auto repair :

2-the pressure switch that is located on the valve body of the transmission

tims auto repair :

sometimes these will brea down with heat when they go bad

tims auto repair :

Full Size Image

tims auto repair :

and cause this problem

tims auto repair :

you may want to replace the pressure switch and the two shift solenoids at the same time,,while you have the pan off

Customer:

ok...

tims auto repair :

but do scan it again,,just to see if you get a code for this or shift solenoid

tims auto repair :

again,,the ignition switch is the likley problem on this madel

Customer:

I will try to get codes again first ..then go from there......cool....thank...I never would have thought of e switch....

tims auto repair :

you are very welcome

Customer:

ignition switch..

tims auto repair :



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Tim's Auto Repair, Mechanic
Category: Car
Satisfied Customers: 13187
Experience: Have owned a repair shop for 25 yrs.
Tim's Auto Repair and 10 other Car Specialists are ready to help you

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Tim&#039;s Auto Repair
Tim's Auto Repair
Auto Mechanic
13187 Satisfied Customers
Have owned a repair shop for 25 yrs.