Thread: P0753, P0758, P1860, 1-2 and 2-3 shift solenoid and TCC pulse width modulator errors

Hello this is my first post on here. So Im thanking all of you for any input on this problem. Here it goes............

Im having transmission problems on my 2001 GP-se. First off its giving me these three error codes (P0753, P0758, P1860), 1-2 and 2-3 shift solenoid and TCC pulse width modulator errors. When you stick it in Drive and take off it starts out in 3rd gear instead of kicking down to 1st. When you pull it down into 1st it will only take off in 2nd gear, or while driving I can pull it form 2nd to 1st and it will not engage 1st gear ever. It will not kickdown while moving in drive if I step on the pedal to get it up a hill, I have to pull it down into 2nd to get it moving. I have checked voltage down to the trans housing on the harness connector. Im getting the proper 12 volts to pin E on the harness, and also checked the resistance of each solenoid on the transaxle case connector. 1-2 gets 23K, 2-3 gets 23K, and TCC is getting 12K, I have also Cleared these error codes after testing and they keep coming back. My routine to get the car moving consists putting shifter in 2nd then shift to third then I can here it shift to 4th but the convertor never feels like it locks up, I have to do this since if I leave it in drive it stays in 3rd. I looked at the ohms resistance chart and see that all three of my error codes are tied into pin E (pink) on the harness. 1-2 is A-E, 2-3 is B-E, TCC is T-E, I have checked there resistance by going through A-E for the 1-2. Im not sure if my 1-2 solenoid is stuck in 2nd or if I have a problem with my range selector. Im lost as of now and will be greatly appreciated of any knowledge I can pull from you guys/gals.

Thanks,
Josh

I have verified 12 volts to pin E on the transaxle connector, also checked ground straps on the bellhousing. Im an f-body guy most of my LT1 Transam sensor's are in the thousands on resistance, this is why I said 23K instead of 23ohms so I know all the solenoids are testing correct. Im going to disconncect the harness from the PCM and check voltage up to the computer so I know Im getting a complete circuit. As soon as I type this up I will go test and reply back what I find.

Thanks a million for the quick response Trannyman95, I actual stumbled across your website before I found this message board and it has been very helpfull to me.

Josh

I also took it on a test drive and when I pull the 10amp fuse to the pink 12volt source it experiences the exact same symptom as when I get good power up to the PCM.