I'm working on a 02 suburban with a 4l60E that will go in and out of limp mode. The only code is P0756. I changed the B solenoid and the ignition switch so far without any luck. Need some help fellas on this so any input would be great! I do have a wiring ? That I need some input on, the mlps that is mounted on the driver side of the tranny has to 2 wiring plugs that plug into it. The one that has 6 total wires has a purple/white wire that I'm not getting ground nor voltage from the connector. Does anyone have any info on the wire? The issue is intermittent and can sometimes be corrected just by turning off the truck and back on.

 

Try replacing the speed sensor

 

Tahoe0153, Thanks for the reply. I will replace it and report back thanks.

 

Replaced VSS sensor and the problem still exist

 

Try taking it to a qualified mechanic?