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.

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  • 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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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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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

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Hesitation at speed; Shifting irregular at speed; Power loss on acceleration from stop after warm-up

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Where is the neutral safety switch on a 1997 Buick LeSabre Limited

It is part of the range selector switch on the transmission.
Get a wiring diagram if the trans wiring and it is very to follow to determine if it is working or not

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I have p0700 and p0705 codes, p0455, p1125, and p2125 and p2138 codes


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Possible causes

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Check transmission light on....rpms up and down....code...po705...trans range sensor

I assume we're talking about a Jeep? Is your overdrive slipping out on it's own? Then going back to normal if you start the vehicle? Any trouble with the back-up lights?
Codes are just starting points. Honestly I would ty cleaning these sensors first(especially the NSS (indicative of the Check eng lite)...I think it's on the drivers side of the trans.), but be careful!!!! they are easy to break!!!! So before you go spending thousands on a new tranny spend a few $'s cleaning them (NSS gets really dirty), also the TPS, throttle position sensor (it's also a trans sensor).
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The P0705 error means the computer sensed something wrong with the sensor. Ex: the vehicle is moving when the sensor indicates it's in park, or possibly a different gear,or it sensed the input shaft (engine) start turning when the sensor is indicating it's in drive.

The NSS is about $350 new, but you don't need to replace it as it costs nothing to clean and rebuild. Figure maybe an hour of labor, a socket set, an adjustable wrench, philips screwdriver to remove and disassemble it. You'll want some kind of solvent (not WD40), a wire brush, and/or sandpaper to clean up the contacts, and some oxyguard or di-electric grease (like the red grease they put on your battery posts to keep them from corroding?). to coat the contacts when your done. Spraying the shaft of the sensor with penetrating fluid ahead of time will help get it off.
NSS (neutral safety switch) >>> 12mm wrench, a crescent wrench and a screwdriver.
Located on the driver's side of the transmission. That's where I would start.
Sensors are TPS (Throttle Position Sensor), NSS, Speed (transmission speed, not drive speed).
Hope this helps, but without being there it's all I can do.
Good luck
Maybe this will help make some sense of it:

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3 Answers

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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