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Old 01-16-2020, 04:18 PM   #1
floridasl22002
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Join Date: Jul 2014
Location: Central Florida
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2003 L-Series 3.0L Sedan
Default Where is the output speedsensor on the L300 V6 Sedan?

My son has a 2003 V6 L300. He's just gone back to college, so he's 200 miles away in Jacksonville, FL and I'm not far from Orlando. He phoned me late last week to say the speedo had gone ape and one minute would be working fine, then would drop to 0 to 20 mph next. Additionally, he was finding the car would shift gear oddly as if the tranny wasn't quite sure what to do. He thought it could be an errant speed sensor. My only suggestion was to take it to local garage and get it checked out. I'd priced the sensor at RA and it was from $10.00 upwards.

He took it to a Tranny shop just down the road from his college, left the car with them and hoped they could determine the culprit and fix it.

Anyhow, they called him and said the sensor was damaged and had a sliver of metal sticking in it. They then told him they couldn't install a new sensor as they only did repair and warranty work but they could do a transmission refurbishment and it would only cost $800.00 in bits and $900.00 in labor!!!! Duh... do I look like a Cabbage?? Another example of rip off merchants.

The car is still with him and although the shifts have improved as the metal sliver has been removed, we know from what we were told the sensor was pierced by the metal. As the sensor works via a magnet, our guess is the metal sliver was confusing the sensor. At this stage of the game, all I want to do is replace the damn sensor and see how it runs for now.

I travel over to see him in a few weeks time, so I said I'd get a new sensor from RA, and replace it when I was there. The only problem I have, is that the Haynes Manual has only a vague photo of the sensor location, but it's impossible to determine where it is from the photo. I've also looked online and can find absolutely nothing to help me ID where this sensor is located.

If anyone can give me an inkling where it will be located, it will save me valuable time trying to locate it myself.

Thanks in advance.

Last edited by floridasl22002; 01-16-2020 at 04:24 PM..

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Old 01-16-2020, 06:17 PM   #2
Dsaturn
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2001 L-Series 2.2L Sedan
Default Re: Where is the output speedsensor on the L300 V6 Sedan?

It is on the passenger side of the trans behind the engine. The V6 probably has to be accessed from under the vehicle. Do not buy the cheap sensor, Get the AC delco oem. I bought a cheap one and it failed in 6 months. The slither of metal though could indicate something broke in Trans, How big was slither? Scroll down on this page, It shows location. https://at-manuals.com/manuals/4t40e-4t45e/

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Old 01-16-2020, 07:14 PM   #3
floridasl22002
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2003 L-Series 3.0L Sedan
Default Re: Where is the output speedsensor on the L300 V6 Sedan?

Thanks.
The guy who checked the car over (he was an ex Saturn owner & techy) said that something had broken in the tranny and the metal part had hit the sensor and actually punctured it. When I asked my son if he showed him the metal, he didn't. When I asked my lad to phone and ask him if he still had the sliver of metal, he said he didn't but stated that it was like a sliver of glass. Hence he said the tranny needed rebuilding, etc. That is not a financial route I will down down, given the cars value. I'd rather stick a new sensor in and if it works OK, then fine. If not I told my lad we'd be better just selling it 'as is" and putting the tranny money and sale price into something newer and better.

So at this moment in time, we have only this guys word for what he found and I am pissed that he didn't think to keep the metal piece to show my lad. Poor business practise IMHO. The only thing we can think of right now is that mid summer last year we had both his driveshafts replaced as well as the seal/bearing kit you should replace at the same time. my indo garage who I normally trust did that job and made a complete dogs bollock of the job. Replacing 2 driveshafts should have taken a few hours. it took nearly 3 days! When he pulled the shafts, of course the small stub axales came out too and he just didn't know what he'd done. Had he read the instructions that came with the new driveshafts, he would have seen that the stubs do come out and the seals and bearing should be replaced per drive shaft when replaced. So we think maybe some damage was done at that time. Just don't know?

If I replace the sensor and there is more metal slivers attached to it, then it does not bode well. My lad's had the car for 5 years now, saw him through HS, and now college. I was and still am hoping it will keep going to his graduation in 2021, then we can get something else.

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Old 01-16-2020, 07:43 PM   #4
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2003 L-Series 3.0L Sedan
Default Re: Where is the output speedsensor on the L300 V6 Sedan?

If metal pierced the speed sensor, this suggests relatively easy access for replacement unless a wrench error code pointed to it. If found with an error code, replacing it should not be difficult as its not internal like the valve solenoids under the valve body cover. Replacing it from the view point of a xmission repair shop may be biased for several reasons; long term reliability over simply replacing one part with a known metal piece damaging the sensor by disassembling and replacing worn parts to ensure a rebuild is cost effective by not recommending just a sensor. It's always the customer with the last say in expensive repairs. If sensor replacement is performed by a this shop, it's presumed they shop may not guarantee xmission reliability since failure can be a direct result of pre-existing damage a speed sensor has no control over so a shop already anticipating possible issues will tend to recommend a complete rebuild. There is another possibility no one has considered, replacing the xmission altogether with a used one and accept any warranty or lack of with a replacement xmission.

Was this xmission ever serviced, oil and filter replaced? If the most inexpensive repair is to replace the speed sensor, you have nothing to lose except time and part cost without any guarantee of success. Whether or not metal was found to damage the sensor may be seen as soon as the sensor is removed and cleaned with solvent.

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Old 01-17-2020, 10:32 AM   #5
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2003 L-Series 3.0L Sedan
Default Re: Where is the output speedsensor on the L300 V6 Sedan?

Quote:
Originally Posted by fdryer View Post
If metal pierced the speed sensor, this suggests relatively easy access for replacement unless a wrench error code pointed to it. If found with an error code, replacing it should not be difficult as its not internal like the valve solenoids under the valve body cover. Replacing it from the view point of a xmission repair shop may be biased for several reasons; long term reliability over simply replacing one part with a known metal piece damaging the sensor by disassembling and replacing worn parts to ensure a rebuild is cost effective by not recommending just a sensor. It's always the customer with the last say in expensive repairs. If sensor replacement is performed by a this shop, it's presumed they shop may not guarantee xmission reliability since failure can be a direct result of pre-existing damage a speed sensor has no control over so a shop already anticipating possible issues will tend to recommend a complete rebuild. There is another possibility no one has considered, replacing the xmission altogether with a used one and accept any warranty or lack of with a replacement xmission.

Was this xmission ever serviced, oil and filter replaced? If the most inexpensive repair is to replace the speed sensor, you have nothing to lose except time and part cost without any guarantee of success. Whether or not metal was found to damage the sensor may be seen as soon as the sensor is removed and cleaned with solvent.
Since we bought this car, it has a full & complete service history. The only issues we had with the transmission was the hard shifting coupled with wrench light a few years ago. Again we took it to a tranny specialist who recommended we spend $2000 on a rebuild. The car cost $2100. So go figure what we did!

The problem persisted and I eventually replaced all the shift and pressure solenoids myself along with a fluid and filter change. The hard shifting/wrench light were gone. That was in 2018. 3 months later, after that he had a leak of fluid from the tranny pan, so it went into the indi garage for a new pan gasket (I wasn't even going to get my hands dirty on that job again) and as it was off, a new filter and fluid were put in. That was just 180 miles after I'd put in the earlier fresh fluid and filter!

Since then the tranny performed fine. Then in July 2019 we had the driveshafts both sides replaced by the same indi garage, with the cock-up on the job as detailed earlier. The mechanic is an OK and to an extent knows his stuff, but he is sloppy.The ONLY internal stuff on the tranny recently was this mechanic replacing the bearings and seals on the stub axles when they came out when he was replacing the driveshafts. hat is the ONLY thing we can think of right now. If the dumb assed mechanic at the tranny shop last week hadn't have thrown away the sliver of metal he found on/in the sensor, we may have had a clue where the metal may have come from. I can only hope this mechanic never works for rhe FAA on plane crashes! It is for reasons like this I try and do most jobs myself. You pay professional fees and expect professional competence! (rant over).

My two son's both had Satty's. The eldest I bougt him a 2002 SL2. That was a peach and we only sold it because he moved to Brooklyn for college at NYU. It cost me pennies in maintenance and was 100% reliable. We also got $700.00 more for it than we paid for it! That cannot be said for the L300. Whilst it has NEVER broken down in 5 years of ownership, it has probably cost more in maintenance than my Suburban of the same vintage. It's a nice car and is fast and has good handling, but it is like a greedy baby. it constantly requires feeding (money)! When it goes, I will not shed a tear.

Anyway, now I know the sensor location, I'll swap that and see where we go from there.

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