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Greg, ASE Certified Technician
Category: Chevy
Satisfied Customers: 387
Experience:  22+ years of experience on GM vehicles. Shop Owner/lead tech. Specializing in GM products.
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OBD-II code PO502, VSS Circuit Low Input What does this mean?

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OBD-II code PO502, "VSS Circuit Low Input" What does this mean?
Year make and model, Engine size?
Customer: replied 9 years ago.
Reply to Greg's Post: 1998 Chev. Cavalier 2.2L
Greg and 2 other Chevy Specialists are ready to help you
Customer: replied 9 years ago.
Reply to Greg's Post: how do I access the A/T output speed sensor?
Its on the side of the trans axle, pretty tight area, heres some pics.graphicgraphic
Customer: replied 9 years ago.
Reply to Greg's Post: Greg,
I replaced the A/T Vehicle Speed Sensor (VSS), this didn't solve this problem. Let me tell you all I know about this. This is my 17yr. old son's car, and while troubleshooting this problem I have found these things; Speedometer doesn't work, cruise control doesn't work, Transmission won't shift out of low, but hooks up solid, no slippage, (reverse is good, hooks up solid too.) any ideas?    [email protected]
Customer: replied 9 years ago.
Relist: I still need help.

In the first images i sent you there is a section called Diagnostic aids. Look at them and check for the possible causes of this problem.