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Transmission Input sensor

Tiny
ANNAJMCCLAIN
  • MEMBER
  • 2010 BUICK REGAL
  • 6 CYL
  • AUTOMATIC
  • 80,000 MILES
I am being told that my car may need an input sensor which is located once that valve body is removed on the transmission. However, when the indicator light came on the car wouldn't even run or reverse. The next day it did fine and the shop said it has two codes for internal transmission error. Fast forward drive car to transmission shop (it drove fine) and they say they don't know if the transmission is bad but that the code they got was in the input center and it may need an input sensor (which again is located off the valve body). But this would not have made it not run or go in reverse? It literally was being floored and only going about as fast as I can walk and then wouldn't even reverse, again next day it drove fine-ish. I need help! Because is it the transmission or the sensor? The car BB is like 4, 5 and I can't spend $3,000.00 on fixing a transmission. They also said they need to see if there is metal after they pull the drain plug?
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Tuesday, February 2nd, 2021 AT 1:14 PM

13 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

The input speed sensor will not cause this.

https://www.2carpros.com/articles/automatic-transmission-problems

I would start by changing the fluid and filter. A clogged filter will cause it to fall out of gear.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Roy

Input Speed Sensor Replacement
Removal Procedure
1. Remove the case side cover.
2. Disconnect the input speed sensor electrical connector.

imageOpen In New TabZoom/Print

3. Remove the input speed sensor retaining clip (441).
4. Remove the input speed sensor (440).

imageOpen In New TabZoom/Print

5. Inspect the input speed sensor (440) for the following conditions:
Damaged or missing magnet
Damaged housing
Bent or missing electrical terminals
Damaged speed sensor clip (441)

Case Side Cover Replacement
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the air cleaner intake duct.
3. Remove the engine mount struts.
4. Install the engine support fixture.
5. Disconnect the transmission wiring harness connector.
6. Raise and support the vehicle.
7. Remove the left drive axle from the transaxle.
8. Secure the drive axle to the steering knuckle/strut.

Caution: Failure to disconnect the intermediate shaft from the rack and pinion stub shaft result in damage to the steering gear and/or damage to the intermediate shaft. This damage may cause loss of steering control which could result in personal injury.

9. Remove the intermediate steering shaft pinch bolt and the shaft from the steering gear.
10. Remove the 3-way catalytic converter pipe from right exhaust manifold.
11. Support the right and the left side of the frame with jackstands.
12. Remove the Transaxle mount.
13. Loosen the engine mount lower nuts.
14. Loosen the right side frame bolts and remove the left side frame bolts.
15. Adjust the jackstand to the lower left side of the frame.
16. Position the drain pan under the transaxle.

imageOpen In New TabZoom/Print

17. Remove the case side cover bolts (56-58).

imageOpen In New TabZoom/Print

18. Remove the case side cover pan (53).
19. Remove the case side cover gasket (54).
20. Clean the case.
21. Clean the side cover gasket mating surfaces.
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Tuesday, February 2nd, 2021 AT 1:29 PM
Tiny
ANNAJMCCLAIN
  • MEMBER
  • 7 POSTS
Well, that is the code that popped up? The code that the transmission guy said came through? I am at a loss here. He did say the input sensor would cause it to not shift properly?
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Tuesday, February 2nd, 2021 AT 2:26 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I need the code number that was set.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

It will be like a P and then 4 numbers.

Roy
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Tuesday, February 2nd, 2021 AT 2:30 PM
Tiny
ANNAJMCCLAIN
  • MEMBER
  • 7 POSTS
Okay, I will get it tomorrow and post it. Thank you so much! I am just at a loss because this car has had numerous issues. The ladder being December 2020, and it was the throttle body. Then the light came on, and now this. The regular shop had me take it to a transmission specialist, which you can see how that is progressing thus far.
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Tuesday, February 2nd, 2021 AT 5:19 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Keep me updated.

Roy
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Tuesday, February 2nd, 2021 AT 6:42 PM
Tiny
ANNAJMCCLAIN
  • MEMBER
  • 7 POSTS
Roy,

So I called him and he said that they were going to get it on the rack today. He said this:

1. He needs to see if there is metal in the fluid.

If there is, it's a transmission rebuild.

2. If there is no metal he said that the Input sensor on the transmission should be replaced and "we will see if that fixes the issue".

3. When asked about the code he said he forgot but that its starts with a P.

Any advice you have other than possibly find another mechanic?

Also, can you just not tell if a transmission is broken unless you are in the actual parts? As a general rule?
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Thursday, February 4th, 2021 AT 8:54 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
He is guessing. Press him for the code number.

Tell him if he replaces the input speed sensor and it does not work, you will not pay for that repair. It will be on him.

It does sound like you need someone more knowledgeable.

Roy
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Thursday, February 4th, 2021 AT 9:39 AM
Tiny
ANNAJMCCLAIN
  • MEMBER
  • 7 POSTS
Roy,

He said that they pulled the drain plug no metal, but then they took off the valve body and side cover and took something out (sensor or something) and that they saw not bits of metal but like fine grains of metal and said it likely an internal problem and will need a new transmission. He said we could replace the sensor, but that's not going to do anything. Thoughts?
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Friday, February 5th, 2021 AT 10:12 AM
Tiny
ANNAJMCCLAIN
  • MEMBER
  • 7 POSTS
I am going to the shop physically and will write down exactly what he says. But that is the summary.
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Friday, February 5th, 2021 AT 10:12 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Again, he is guessing.

Roy
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Friday, February 5th, 2021 AT 11:41 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you respond? I got an email but nothing came through.

Roy
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Friday, February 5th, 2021 AT 12:02 PM
Tiny
ANNAJMCCLAIN
  • MEMBER
  • 7 POSTS
Yes I did. You didn't get it or the picture I sent?
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Friday, February 5th, 2021 AT 12:07 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, I did not get a picture at all.

Did you upload it to this post?

Roy
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Friday, February 5th, 2021 AT 12:10 PM

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