Quote:
Originally Posted by ritchie lee
Driving home about 50 miles, with 10 miles to go. The speedometer quits, the ABS light comes on, and the transmission malfuctions ( appears to be in 2nd gear only). I managed to drive slowly home as is. When I get home turn off, restarting the check engine light is now on, able to retrive computer code P0502 (vehical speed sensor A circuit low input). The next day everything seem to work fine no check engine light, how ever I am still able to get P0502 code. I'm scared to drive this car to far from home. 1996 Chevy suburban, 5.7 vortec, 4wd 4L60E transmission. Help!
I'm thinking this speed sensor is either on the transmission or the transfer case. 
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Speed sensor is on left rear of transpher case.
As with any code it does not say replace sensor but check it out.
First thing check wiring and plug in to it.
Let us know how it goes.
Ps code will need cleared with a scanner after the repair to make it go away.