Yes, I did post this on Engines & Transmissions as well.
2001 Blazer. Replace transmission fluid 3 weeks ago without a flush. Just started limp mode. No computer codes showed.
Replace speed sensor and both shift solenoids. Still doing the same thing.

 

As far as I know, with a busted VSS You'd have the dash ABS indicator on.
What happens if You transfer directly "3"-"2"-"1" from a column? Any changes (that is transmission shifting)....?

 

If I'm driving at 50 miles per hour which is about my max speed limit at the moment I assume it is in 3rd gear. If I let off the gas it seems like it goes into 4th but will go immediately back to 3rd with gas.
As far as manually downshifting from drive to 3rd nothing happens. From 3rd to 2nd there is no 2nd. From 2nd to 1st there is a 1st.

 

The ABS light comes on intermittently. The transmission has three speed sensors. Front and rear sensors and the VSS. I replaced the VSS and no change.

 

Looks like the damage happened while oil replacement. I'm not in cope with Blazers transmissions enough to support You, but yet it looks strange You have no error codes from TCU. Check if the scanner supports Your TCU. If not that would explain no error codes.

 

[QUOTE=Mike.308;686053]Looks like the damage happened while oil replacement. I'm not in cope with Blazers transmissions enough to support You, but yet it looks strange You have no error codes from TCU. Check if the scanner supports Your TCU. If not that would explain no error codes.[/

Nothing was damaged. I siphoned off the fluid and did not drop the pan.
Took it in today a quality shop and there were no transmission codes. It is mechanical. Thanks

 

2001 Blazer. Replace 2 qts of transmission fluid 3 weeks ago without a flush. Just started limp mode. 2 weeks layer. I have seen from other web people suggesting how to get your car out of limp mode by doing the few things but don't know if really works as I had not tried them yet. Who has a suggestion for me without bringing it into the shop I'd like to know. OBD2 showed no codes other than I need to replace my abs sensors
Do I need a new transmission that I can't afford or not? Thanks
If and but how why

No computer codes showed.
Replace speed sensor and both shift solenoids. Still doing the same thing.[/QUOTE]

 

2001 Blazer. Replace 2 qts of transmission fluid 3 weeks ago without a flush. Just started limp mode. 2 weeks layer. I have seen from other web people suggesting how to get your car out of limp mode by doing the few things but don't know if really works as I had not tried them yet. Who has a suggestion for me without bringing it into the shop I'd like to know. OBD2 showed no codes other than I need to replace my abs sensors
Do I need a new transmission that I can't afford or not? Thanks
If and but how why

No computer codes showed.
Replace speed sensor and both shift solenoids. Still doing the same thing.[/QUOTE]