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Speedometer issue?

Tiny
LAVELL11
  • MEMBER
  • 2008 PONTIAC GRAND PRIX
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 143,000 MILES
Hello, I'm having a problem with my car speedometer. I changed out the speed sensor ACDELCO seem like it fixed for two days now but back to the same problem. I don't have any check light at all my car shift fine transmission not slipping I noticed on highway doing 65 my speedometer was flicking then once came to a stop it felt like hard shift but pick back up speed slowly after I brake. I don't know if the speed sensor bad or not need. Help because there no codes to determine this. I don't know where to start to be honest. This problem just started.
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Wednesday, August 2nd, 2023 AT 4:46 AM

15 Replies

Tiny
LAVELL11
  • MEMBER
  • 84 POSTS
This problem just started
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Wednesday, August 2nd, 2023 AT 6:50 AM
Tiny
LAVELL11
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  • 84 POSTS
I scan my car this all I see to be honest.
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Wednesday, August 2nd, 2023 AT 3:54 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
With these codes it looks like the BCM is not working, which affects the speedometer. Here is how to replace the unit, you can get a preprogrammed unit by searching Google or Ebay. Check out the images (below). Please let us know what happens.
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Thursday, August 3rd, 2023 AT 10:31 AM
Tiny
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  • 84 POSTS
Okay, I will read the information soon. Thanks
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Thursday, August 3rd, 2023 AT 11:40 AM
Tiny
LAVELL11
  • MEMBER
  • 84 POSTS
Here's the video of the speedometer you sure it BCM? I just replaced 2022 from the dealership.
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Thursday, August 3rd, 2023 AT 11:52 AM
Tiny
LAVELL11
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What you get the chance I want to see the wiring harness for the speed sensor because I might have a wire broken somewhere because this problem is random. I know my BCM is okay because all my power works and other needles on my cluster.
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Thursday, August 3rd, 2023 AT 6:50 PM
Tiny
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  • 84 POSTS
Also, I noticed when driving down the road at low speed like 10, 15, 25, or 30 it flickers but when I pick up speed it drives fine. I tested my cruise control for the first time and yes it works perfectly at 60mph its just low speed is giving me problems, that's why I want to trace down a wire causing this.
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Friday, August 4th, 2023 AT 2:03 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Thanks for the video, it helps. This looks like the instrument cluster is bad, you can get a preprogrammed unit by searching Google or Ebay. Here is how to swap it out. Check out the images (below). Please let us know if you need anything else to get the problem fixed.
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Friday, August 4th, 2023 AT 12:09 PM
Tiny
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Okay thanks.
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Friday, August 4th, 2023 AT 12:11 PM
Tiny
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  • 84 POSTS
I found one on Ebay same as mine with part number in great condition. I will see your diagram to install once arrived.
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Friday, August 4th, 2023 AT 3:53 PM
Tiny
KEN L
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Sounds good, have a great weekend.
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Saturday, August 5th, 2023 AT 10:09 AM
Tiny
LAVELL11
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  • 84 POSTS
You too.
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Saturday, August 5th, 2023 AT 10:28 AM
Tiny
KEN L
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Anything?
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Monday, May 6th, 2024 AT 12:15 PM
Tiny
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Hello, the problem fix once I check wires and etc. Driving perfectly now.
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Monday, May 6th, 2024 AT 12:23 PM
Tiny
KEN L
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Thanks for letting us know, we are here to help, please use 2CarPros anytime.
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Monday, May 6th, 2024 AT 8:00 PM

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