Replaced shift solenoids, now no first gear or passing gears

t14harris

The other day, me and my dad replace the A and B solenoids, TCC solenoid and the 3-2 solenoid since I had a few codes for them. However, after reassembly and testing the transmission, it feels like it has no first gear or passing gears. We made sure that everything went back together the way it came out as well as cleaning up the valve body and transmission pan to make sure they were free of debris. This truck has the 4L60E transmission installed and has 220K miles on it. I will have a list of the codes it is throwing now uploaded in the next couple of hour. Please advise.

t14harris

The only code that is appearing now is P0753.

thecardoc3

That's a 1-2 shift solenoid circuit code. That will cause a limp in strategy that results in only having second gear (all solenoids off).

The diagnostics are pretty straight forward once you understand how the computer runs the test that generates this code.

t14harris

Does that mean I have to replace the PCM or is there something else I should look at first?

thecardoc3

It means you need to test for power at the SS1 pin to the PCM under the above conditions. When the solenoid is commanded on you should see close to 0 volts and when it is off battery voltage.

t14harris

Ok, I got you. Thank you for the help. Hopefully I will have this knocked out this weekend.

t14harris

Update: I went ahead and replaced the internal trans harness as well as the ignition switch and that seemed to have of fixed the issue. However, after driving it for a day or two, the ABS and the parking brake lights came on as well as the transmission going into limp mode. This is an intermittent issue right now. I checked the fluids and everything is at the proper level it is supposed to be at. I even checked the fuses via volt meter and visual inspection and they appear fine. Also, the speedometer won't register speed until 5-10 mph. Please advise. Thank you.