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Pontiac Montana 2001 automatic shift speed sensor
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Floodbar
Novice
Mar 5, 2013, 11:35 AM
Post #1 of 16
(8289 views)
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Pontiac Montana 2001 automatic shift speed sensor
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Pontiac Montana
Year 2001
I don't know the size of the engine
The other day my speedometer started to bounce all over the place. Did some research and found that the vehicle speed control sensor needed to be replaced. Easy enough, its right behind the passenger side tire. Well the problem didn't go away. Checked back with the auto store and they said there was another sensor that could cause this. I had them give me the new sensor and replace the vehicle speed control sensor to be sure it wasn't bad. My issue is i cannot find where the automatic shift speed sensor goes. I even took it to a local shop here and we all looked for an hour and couldn't find it. Does any one know or have a picture of where it goes?
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 5, 2013, 11:47 AM
Post #2 of 16
(8270 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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The vehicle speed sensor (10) is in the transaxle's final drive cover on the passenger's side.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Mar 5, 2013, 11:47 AM)
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Floodbar
Novice
Mar 5, 2013, 12:10 PM
Post #3 of 16
(8262 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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Thank you for the pic. Do you k ow the best way to get to that sensor? From the front of the car, from under the car, or where? I went out and looked for the front of the transmission and didn't see it. Is it an external piece or do i have to remove some of the transmission to get to it? I appreciate any assistance.
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 5, 2013, 1:05 PM
Post #4 of 16
(8238 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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You should be able to get to it from the wheel well on the passengers side after you remove the panel. Follow the right side CV axle to where it plugs into the transaxle and that is the final drive case. It is located near the top of the cover. It is in a tight spot and it held into the final drive case with one bolt.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Floodbar
Novice
Mar 5, 2013, 1:37 PM
Post #5 of 16
(8231 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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That souns like the vehicle speed control sensor. I have found that one and now able to replace it quickly. I am trying to replace the automatic shift speed sensor. In the pc above it appears to be part 440 but it looks like it would be on the drivers side on the top of the transmission. However, looking on the car i cannot find it. I may be wrong as i am a computer tech not a car guy. So please forgive me for my ignorance if it is in the spot you say.
(This post was edited by Floodbar on Mar 5, 2013, 1:38 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 5, 2013, 3:09 PM
Post #6 of 16
(8219 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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(440) is the input speed sensor. It is inside the transaxle. The engine controller uses the input speed sensor for calculating gear ratio and TCC slip speed. It has nothing to do with the speedometer.
The VSS (10) is the sensor that sends a vehicle speed signal to the engine controller. The engine controller communicates with the instrument cluster module (IPM) over a data bus. The PCM sends vehicle speed information over the bus to the IPM. The IPM uses this information to operate the speedometer motor.
Usually if you have a speed sensor problem, the check engine light will come on because the PCM isn't seeing the speed sensor signal or a corrupted signal, so it sets a vehicle speed sensor trouble code.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Mar 5, 2013, 3:10 PM)
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Floodbar
Novice
Mar 5, 2013, 3:36 PM
Post #7 of 16
(8213 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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Makes since. So only the vehicle control sensor would cause the issue with a speedometer all over the place? By all over the place i mean i am doing 70 mph and the speedometer says i am doing 30 then 70 then 48. It just bounces and will not let me use the cruise and from what i have read the abs is also out. I replaced that sensor twice and orielys sold me the automatic shift speed sensor and told me that could also cause the issue. Looks about as easy to replace as the other one i replaced. It has one wire harness attach and one bolt that hold it in. Any ideals? Or just take back the sensor?
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Floodbar
Novice
Mar 5, 2013, 3:51 PM
Post #8 of 16
(8211 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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I don't know if this will help any but the receipt from orielys says its part number bwd s8204 transmission speed sensor. I only assumed that part 440 was the one i needed because its the only sensor that looks close to the one i have in the picture above but it doesn't look exactly like that.
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MarineGrunt
Enthusiast
Mar 5, 2013, 5:33 PM
Post #9 of 16
(8199 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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Can you take a picture of the sensor you have and post it?
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 5, 2013, 5:35 PM
Post #10 of 16
(8199 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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It is possible the speed sensor isn't the culprit. Just because you read somewhere that a speed sensor replacement solved a problem, doesn't necessary mean it will solve your problem.
To be able to diagnose and fix this problem without chasing a bunch of ghosts you need some data. You have a few options.
(1) You get hold of an enhanced scan tool and monitor the datastream for the PCM and the IPM. Watch the VSS PID and see if data is showing correctly for the vehicle's speed. Also check for any trouble codes that may be stored and are related to your problem. If you have bidirectional control at the IPM, you can do a gauge sweep test to be sure the processor is controlling the gauge motors.
(2) Grab a graphing multimeter or labscope and wiring diagram and measure the signal from the speed sensor at the PCM connector. That would tell you if the signal is good from the sensor, but you wouldn't be able to see what happens after the PCM because it becomes digitized and sent over a data bus unless you know how to interpret data bus transmissions.
(3) Take it to a shop that has the equipment, information, and knowledge to diagnose a problem like that. Pay a tech to diag it, then you have the choice of resolving the problem yourself or letting the shop handle it.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Mar 5, 2013, 5:36 PM)
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Floodbar
Novice
Mar 5, 2013, 6:59 PM
Post #11 of 16
(8189 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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Thank for your help discretesignals. I will most likely take it to a shop. Someone said that their were two sensors that could cause my problem. Was able to find one was just trying to replace the other as well. Sometimes cheaper. To marinegrunt, not much of a forum user so i am unsure how to post a pic.
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 5, 2013, 7:04 PM
Post #12 of 16
(8184 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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As you were already informed, the input speed sensor has absolutely nothing to do with the speedometer. Just because some kid behind a parts counter wanted to sell something, doesn't make him right.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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MarineGrunt
Enthusiast
Mar 5, 2013, 9:08 PM
Post #13 of 16
(8166 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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My local GM dealership will diagnose a problem for $45. Of course, they try and talk you into having them repair it right there and say it will only take then a half hour but as DS said, it's your choice. From what I've heard, $45 is pretty cheap so it may not be the same price in your area. It's normally cheaper if you stay away from the dealerships. I just took it there because I thought $45 was a very fair price.
Not saying I'm right because I'm usually not but the first thing that popped in my head was a bad instrument cluster. You can't go guessing on parts though because you end up spending 10 times as much as if you just took it to a shop.
For future reference, in order to post a picture, you have to use a photo hosting site such as photobucket. You create an account, upload the picture, and then click on the image code. You will see where it says image code on the bottom right of the page. When you click on it it will copy it. You then come on here and starting typing your reply. When you are ready to post your picture you right click and then click paste. That copies the image code on your post and it will then show up when you submit your post.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 5, 2013, 9:09 PM
Post #14 of 16
(8166 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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Pic posting: Use something site like Photobucket or find the exact pic and just copy and paste. If for just a part try a popular parts place/chain and copy that pic................ T
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Floodbar
Novice
Mar 7, 2013, 5:09 PM
Post #15 of 16
(8136 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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I took the car in to the shop today. 20 minutes and 10 dollars later my car is fixed. Turned out the sensor that i had replaced did fix the car but it needed the codes cleared. So one more trip to orielys to take back the mystery sensor. I thank you all for your help.
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 7, 2013, 7:14 PM
Post #16 of 16
(8125 views)
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Re: Pontiac Montana 2001 automatic shift speed sensor
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Good to read that your problem is resolved. Interesting a trouble codes set would stop the speedo from working. Have to remember that. Thanks for the follow up.
Closed as solved. Can be reopened upon request by the OP.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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