Question about 1997 Buick LeSabre

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1995 buick lesabre Speedo inop

Codes P0705 P0502 P1629.
Already replaced the speed sensor and the Trans position switch(neutral safety). Speedo was intermittent, now it's just inop.
Engine light is on and trans in limp mode.
When the speedo worked, the trans shifted perfect.
Thanks

Posted by on

  • bjsj1981 Feb 02, 2009

    Replaced the PCM and everything works perfect.

    This is an OBD 1.5

    Obd 1 computer with an OBD 2 plug.

    PCM's are know to have problems

  • Anonymous Mar 26, 2014

    code says neutral safety switch but it has already been replaced

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  • Contributor
  • 33 Answers

I would have the transmission shop check out the transmission.
The transmission may have a soleniod issue.

Posted on Feb 01, 2009

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ginko
  • 19396 Answers

SOURCE: 1995 Buick Lesabre Speedo inop

It may be a faulty speedometer with a short inside, or a short on speedometer wirings or connector.

Whenever car vibration cause the wiring to short, there you lose speedometer and trans functionality.

You need to access the speedometer connector and wirings to
instrument panel to fix this.

Posted on Feb 01, 2009

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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Hope this helps, but without being there it's all I can do.
Good luck
Maybe this will help make some sense of it:
http://en.wikipedia.org/wiki/Transmission_control_unit

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1995 Buick Lesabre Speedo inop


It may be a faulty speedometer with a short inside, or a short on speedometer wirings or connector.

Whenever car vibration cause the wiring to short, there you lose speedometer and trans functionality.

You need to access the speedometer connector and wirings to
instrument panel to fix this.

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