No speedometer and transmission does not shift out of first gear

Tiny
BERNADETTE MCFALL
  • MEMBER
  • 2002 PONTIAC GRAND PRIX
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 23,788 MILES
We had the speed sensor change and it drove good for a day or two but the speedometer stop working and now it does not shift out of first.
Saturday, August 4th, 2018 AT 1:32 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

The reason the transmission will not shift is the speedometer is not sending a signal to the PCM.

The first thing I would check is the connector at the sensor. They are common for failing from either loose pins, damaged pins or burned pins.

Roy
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Saturday, August 4th, 2018 AT 1:58 PM

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