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I am working on a 95 Eldorado, it has a P024 current code, the speedometer does not work and it has a check engine light.

DSCN9897_zpsbv6gnm63.jpg

My friend is trying to sell the car and I am going through it to put it in saleable condition.   The VSS or Vehicle Speed Sensor is located in a tough spot to get at sort of behind the right engine mount support in the top of the right tranny output shaft.   I needed to get the engine mount support out of the way to make room to get at the 10mm bolt that holds the VSS in. 

I supported the car on a bottle jack, removed the right dog bone, put a bottle jack under the transmission and removed the engine mount support bolts including the 4 nuts on the rubber mount.  Gently jacked the tranny up to make room to remove the support and pulled it out.  

Here is what the area looks like

DSCN9901_zpskf1ekms3.jpg

I took the VSS (vehicle speed sensor) out and tested it with an ohm meter, and got 0 (zero) resistance, as if it were open.   The new VSS had a resistance of 1500 ohms, so I knew I found the problem. 

Here is the VSS sensor:

DSCN9896_zpszyhmvka0.jpg

Not a bad job, a little tight.  I got a little nervous with how high I needed to jack the tranny to gain room to get the support out.   If I wanted to play it safe, I would probably remove the axle next time, so as to NOT pull the inner CV mount out of its seat.  All good though. 

The FSM states that a current P024 in the event of a failure, 1) turns on Service Engine Soon MIL, Cruise Control is disabled, TCC is disabled, The PCM will substitute a calculated vehicle speed based on the transaxle input speed and the current gear commanded (gear ratio), transaxle freezes transaxle in current gear and torque management is disabled. 

The only problem that I noted was that the tranny did not appear to go into OD, the TCC was not engaging. 

The check engine light is now out.

Hope this helps.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Update on this 95 Eldorado.

First, I want to say, that if you are a lot younger than I or if you have a lift, it is probably possible to remove the 10mm bolt holding in the VSS, without removing the engine mount bracket, its just a lot tighter, a small 1/4" drive ratchet, short extension and 10mm socket and maybe even a small 10mm wrench would do the trick, the angle laying on the floor is a little rough.  As you can see from the photo, its tight, so I removed the engine mount bracket to clear the area.

As I noted above, a bad VSS (vehicle speed sensor) knocked out the speedometer.  However, it is interesting to note, that its not just the speedometer that is impacted.   My friend told me, oh its only the speedometer, don't worry about it.   Well, no, its not just the speedometer as a matter of fact. 

As I noted above:

The FSM states that a current P024 in the event of a failure, 1) turns on Service Engine Soon MIL (Yes it was ON), Cruise Control is disabled (Not confirmed but I didn't use it), TCC is disabled (Yes, NO TCC engagement, did brake tap test at 55 mph), The PCM will substitute a calculated vehicle speed based on the transaxle input speed and the current gear commanded (gear ratio), transaxle freezes transaxle in current gear and torque management is disabled (very interesting, the transmission shifts more positively/quicker and the Traction Control message is gone!)

Today I drove it to my favorite scrapyard, Lakewood Auto Parts, in Linderhurst, LI, NY, they ship by the way and I can always act on your behalf and inspect the parts first.  Anyway its about 20 miles away. 

At the beginning of the trip, I noticed that the RANGE has LO displayed and no mileage, hmm, how could that be?, I have 3/4 tank of gas and it states LO, hmm, I make a note to read the FSM when I get home and figure out why.  I was thinking that it might have had to so with a fuel level sensor but, I showed 3/4 of a tank and I didn't have a code for it.   

I start the ride and I start resetting the dash, AVG MPH, FUEL USED, AVG MPG, etc., the figures were all messed up very odd.   THEN, it dawned on me, the computer did not have a Miles Per Hour figure to figure out all of these things mathematically and that is why the figures were wacky.  The bad VSS, deprived the computer with Miles Per Hour data and it was not capable of producing fuel statistics, WOW... light goes off over my head.  Suddenly about 15 miles into the trip, the LO changed to 40, and the figure has been creeping upward every since, its up to a range of 88 now, but I am sure the more I drive it, it will continue to climb, it is not calculating as fast the my 96 OBD2 did which was instant. 

So its NOT just the speedometer that is non-functional when the VSS, P024 code shows, it affects many systems!   We never stop learning.

I am getting Level Control and Suspension codes and messages on the DIC, and discovered that the 4" link  that connects the Level Control Sensor to the suspension was missing and went to the scrap yard to find a link.  I will cover this on a different thread. 

Level%20Control%20Link%204%20inch_zps3u4

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I recall the VSS being easy to get to from behind the right front tire, with steering turned all the way to the left, without raising the car, from a creeper.  The 10mm bolt is best accessed with a 1/4" ratchet.  Is this different from the cars you guys are talking about?

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You are a better man than me, its a long reach behind the engine mount bracket.  The photo shows how deep this is, the bolt is behind the engine mount bracket, yes it can be done as you know.   That is why I back peddled and said, that it could be done without removing the engine mount bracket in my second post here so younger and smaller owners out there try that method first.  Me, I like taking stuff apart  ;)

Its an awkward spot having never done it before, maybe now that I did it, it would be easier.  On a lift, it would be a cakewalk

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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