Shift Issue | 1993 Chevrolet Lumina | 4T60E

New Transmission Not Wired the Same as the Old

93_chevy_lumina_bigThis 1993 Chevrolet Lumina came in with a transmission shifting complaint. The customer had a transmission issue and had a used transmission installed. After the installation the vehicle still wasn’t shifting right. I verified the complaint on a test drive and found that this car had no 1st or 4th gear. With the scan tool hooked up, I looked for any set codes and none were found. My next step was to verify the transmission fluid level, which was correct.

My next test was to use the scan tool and try to command shift solenoid A, shift solenoid B, and the TCC solenoid while listening for an audible click. I could only hear the TCC solenoid operating. According to the wire diagram, the TCC solenoid has it’s own power on pin A and both shift solenoids share a power on pin E. Seems like we have a power issue to pin E. I pulled off the connector at the transmission and inspected both halves of the connector for any corrosion or damage. Then I tested for power on pin A and E. Both pins had power. Now knowing I had good power at pin E I, had to do further testing.

With the transmission connector still unplugged, I used my test light from battery positive to both shift solenoid control terminals (F and G) while commanding both solenoids with my scan tool. My test light lit up when commanding each shift solenoid. I now know that my power side and ground side are working correctly and that the problem is internal. I hooked my low amp probe around the shift solenoids power wire and commanded both solenoids just to check and see if I had any shorted solenoids. I found that there was no current flowing through either of the shift solenoid circuits.

At this point I either have a broken wire, backed out terminal, unplugged connector, two bad shift solenoids, or a combination of two problems behind the transmission side cover. I then proceeded to remove the side cover to inspect inside. What I found inside wasn’t what I expected. With the cover off I found a few extra items and a few items missing. In 1993 there were 2 different 4T60E available. The old design and the new design. This car was suppose to have the old design but the used transmission that was installed was the new design.

The old design had shift solenoids A and B, TCC solenoid, and 1st and 4th gear pressure switches. The new design also has shift solenoids A and B, and a TCC solenoid. It does not have any pressure switches and also has a TCC PWM solenoid and temp sender. Only the TCC command terminal was the same. The TCC solenoid was also able to receive power on this car but if the transmission problem was the opposite (car that is suppose to have new style trans but had old style installed), it would not have had power. This is why the TCC worked when commanded with the scan tool. This car needed the right transmission installed.


Leave any questions or comments below. Thank you.

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Comments (29)

  1. matt hilderbrand

    thank you for this info i am working on a car now with almost the very same problem.thanks from matt

  2. troy williams

    great info..have same problem thought i had a slipping problem,but trans doing exactly what u posted thks for info..and wire diagram..

  3. George

    Is there an easy way to tell if it’s a new or old 4t60e design looking from the outside?

    I have a 93 I need to replace the tranny and want to buy a core to rebuild to minimize down time.

  4. George

    Would it be safe to say that if I disconnect the transmission connector, turn the key to on, and read A & E. If both have power, it’s a newer version?

  5. Tony

    I have a 1990 Lumina that won’t shift into 3rd gear, 1st and 2nd work fine just won’t shift into 3rd. Any ideas?

    • Travis Dewitz

      Transmissions issues like this need a lot more diagnostic data to come to a conclusion.

  6. Corey

    When I switched out the solenoids in my 94 Buick century 3100 series. There was a pin/plunger looking thing that come out but not all the way, when I took out solenoid for the 1-2 gears. once everything was back together I still do not have 1st gear. Is there a deeper problem then just the solenoids?

    • Corey

      Before I switched solenoids i had no 1st or 4th. After I switched them one was bad others looked fine. once it was back together I now have 4th back however, when i come to a stop I have to manually shift car into lower gear because it stays in 3rd or 4th (I cant tell). When we replaced the solenoids the one on the top left a small plunger came out but when we replaced the others none of them had this so I am wondering if this is the problem why it will not shift into 1st. and also why it will not shift down automatically.

  7. Ed Arnold

    I have a problem with reverse if I dont give to much gas reverse works fine the more gas I give it it seems like it goes out of gear. any suggestions?

    • Travis Dewitz

      I need much more trans data to help but it sounds like a mechanical or fluid issue.

    • mike daniels

      mine did this today –first time i have ever backed up at a high speed–it was an emergency situation . I was thinking perhaps since reverse is about the lowest gear in the car that maybe the rev limiter was kicking in as that is what it felt like,like shutting down fuel flow intermitantly..any ideas would be nice though Hopefully inexpensive ones.Fluyid been swapped out every year religiously.

    • mike daniels

      by the way this car is a low mileage 94 beretta 3100 with the 4T 60 E.

  8. Ryan

    what does a new/good automatic transmission suppose to shift at in a 1996 Chevy Lumina?

  9. mike

    I have a 1996 chevy lumina and the transmission wont shift into reverse or 3rd. any comments on this?

  10. I have recently pulled motor and tranny out of a 1990 3.1 Lumina and installed it in to a 1993 3.1 Lumina. I have ran into a little issue hooking in wiring 0f the 93 into the 90. The plug that hooks into the front of the tranny that runs the solenoids is different. The 90 has a 5 pin plug and the 93 has a 7 pin plug . Is it possible to get a wiring diagram for both plugins. That would possibly allow me to cut out the shift solenoids that are used on this tranny. In a hard spot thanks fro your help.

  11. michael

    I have a 95 lumina 3100. I lost 1&4 gear I’ve had both shift solenoids. In the transmission but still do not have either gear I was told it’s Electrical any ideas on what it could

  12. G. Wayne Fallis

    I have a 96 park ave. My wants to tcc lock even in second gear and soon as possible. I check the power it wasn’t 5 volts. I put a solenoid kit in it. I can’t figure it out can you help

  13. G. Wayne Fallis

    I have a 96 park ave. My last transmission went out so I put in aIi hope a good used one it wants to tcc lock even in second gear and soon as possible. Both transmission act the same. I check the power it wasn’t 5 volts. I put a solenoid kit and seals in it before I installed it. I can’t figure it out can you help

  14. Mat Calhoun

    I recently purchased a 93 luminaries 3.1l. the only issue I have is it will only engage 1-3rd gear. Wont shift into fourth or overdrive however you want to put it. Runs great but that’s destroying fuel mileage. Any suggestions? Thanks in advance.

  15. Scott Miller

    Vin number is 94 lumina euro sport 4t60e tranny date on the door says 93 r the tranny solenoids under the tranny pan or where r they located

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