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Username Post: 1994 c2500 4l80e no 1st or OD.        (Topic#364050)
60chev 
Contributor
Posts: 117
60chev
Loc: Rotchester, NY
Reg: 01-24-09
01-20-21 06:31 AM - Post#2812462    

Transmission only works in 2nd and drive. Have to manually start in 2nd and upshift to drive. Have no 1st gear and no overdrive. Checked for power to tranny and it is getting 12v to red and orange wires. Could it it be just bad shift solenoids maybe or something else. Thanks for any help.

60chev

1960 Bel-Air 4-door 305/3onthe tree
1994 C20 350/4L60e


 
Chevytech 
Subject Matter Expert - Senior Member
Posts: 3922
Chevytech
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
01-20-21 07:14 AM - Post#2812464    
    In response to 60chev

The computer can store trouble codes for the transmission. Check the computer for codes.

For those of you that are wondering why you are not getting replies to your thread:

Did you give the model, year, engine, fuel system type, and transmission information?

If your vehicle has been altered from stock, let us know about that too.


Edited by Chevytech on 01-20-21 09:12 AM. Reason for edit: Missing word

 
65_Impala 
Very Senior Member
Posts: 4666

Reg: 12-29-02
01-20-21 09:07 AM - Post#2812469    
    In response to 60chev

The gear is not there, like being in neutral or the gear is just never selected. Big difference between the two.

The "1-2" shift solenoid is used by the computer to select 1st gear and OD, so with it failed the computer can only shift the transmission between 2nd and 3rd gear.

Can you select manual 1st gear with the shifter? I'm not positive on this but I think the computer still needs to select 1st as well or the transmission will be in 2nd gear.



 
60chev 
Contributor
Posts: 117
60chev
Loc: Rotchester, NY
Reg: 01-24-09
01-20-21 10:09 AM - Post#2812476    
    In response to 65_Impala

No 1st gear at all. Put in 1st and just goes to 2nd. Then take off and manually shift to 3rd/drive. Try to shift to OD, nothing. No slippage in 2nd or drive. No check engine light, OBD 1 anyways. All you will get is a code 12 for tranny trouble I believe.

60chev

1960 Bel-Air 4-door 305/3onthe tree
1994 C20 350/4L60e


Edited by 60chev on 01-20-21 10:13 AM. Reason for edit: No reason given.

 
65_Impala 
Very Senior Member
Posts: 4666

Reg: 12-29-02
01-20-21 11:50 AM - Post#2812488    
    In response to 60chev

  • 60chev Said:
Try to shift to OD, nothing.



No shift or no forward drive?

The shift solenoid could be bad and cause the gears to never get selected because the PCM does the gear selecting with the solenoids.




 
JeremyB 
Senior Member
Posts: 762

Reg: 10-31-01
01-20-21 01:46 PM - Post#2812491    
    In response to 60chev

If it was a 96, I would tell you it has an ignition switch issue and to use a headlight to check for voltage at the trans as voltmeters can give misleading results because they put no load on the circuit



 
60chev 
Contributor
Posts: 117
60chev
Loc: Rotchester, NY
Reg: 01-24-09
01-28-21 10:54 AM - Post#2813139    
    In response to JeremyB

:UPDATE:

Changed out the 2 shift solenoids at back of tranny under the pan and now tranny works fine. Shifts thru all the gears smooth. Double checked and I actually have a 4L60e not 80e FYI. Thanks for your help anyways guys.

60chev

1960 Bel-Air 4-door 305/3onthe tree
1994 C20 350/4L60e


 
someotherguy 
Senior Moderator
Posts: 29352
someotherguy
Loc: Texas
Reg: 08-01-03
01-28-21 11:26 AM - Post#2813141    
    In response to 60chev

  • 60chev Said:
:UPDATE:

Changed out the 2 shift solenoids at back of tranny under the pan and now tranny works fine. Shifts thru all the gears smooth. Double checked and I actually have a 4L60e not 80e FYI. Thanks for your help anyways guys.


Thanks for posting back with the update. IF your C2500 has 6 lug wheels that makes it the 7200lb GVWR model, a.k.a. "light duty 2500" - vs. the regular C2500 most think of with the 8 lug wheels and 8600lb GVWR.

There are quite a few differences between the two models, but yes indeed yours would have the 4L60E instead of the 4L80E. Other than the wheel bolt pattern, 9.5" 14 bolt semi-floating rear axle, a heavier spring package, and a few extra small support pieces on the frame, the truck is more or less a beefed-up C1500. Not putting it down, so don't get me wrong; I've had a few and they're great trucks.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
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