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1994 Chevy Silverado

Tiny
JOELHIG
  • MEMBER
  • 1994 CHEVROLET SILVERADO
1994 Chevy Silverado V8 Two Wheel Drive Automatic

My truck will start and I can put in drive but when I go to drive it, it won't change gears and the speedomoter doesn't work. I got the codes 28 and 72. But not sure what they are or how to fix.
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Wednesday, July 21st, 2010 AT 4:09 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
28 Transmission Range (TR) Pressure Switch Assembly Fault

72 Vehicle Speed Sensor (VSS) Circuit

Based on that, I would say the speed sensor is bad. Have that checked first. The pressure switch won't stop the speedo but the VSS will.
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Thursday, July 22nd, 2010 AT 12:17 AM

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