1993 GMC Sonoma 4.3 Automatic ~ Shifting problems Code 72

1029 Views 4 Replies 2 Participants Last post by Murphy Clyde, Dec 24, 2017

Discussion Starter · Dec 18, 2017

What does the Gear selector switch circuit consist of on the 1993 GMC Sonoma??

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A code 72 is a speed sensor code.

It's in the transmission tail piece (2wd), in the transfer case output shaft area (4wd).

Check the wiring firrst

It's (speed sensor) input is required to shift the trans, Is the speedometer working

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