Speedometer fluctuates

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Jul 21, 2025 | 10:57 AM

Burntable

Thread Starter

Joined: 07-21-2025

Posts: 1

Speedometer fluctuates

2010 HHR speedometer fluctuates and transmission changes hard, I've replaced the transmission speed sensor and all four hubs with new sensors,any idea what it could be

Jul 21, 2025 | 11:42 AM

Oldblue

Administrator

Joined: 10-13-2011

Posts: 39,900

From: Welland,Ont Canada

I’m thinking those 4 bolts in the under hood fuse box need to be tightened up! Then press all the fuses and relays firmly into position, start there!

Those 7 mm bolts!

Jul 21, 2025 | 01:20 PM

donbrew

Moderator

Joined: 01-23-2009

Posts: 26,448

From: Fredericksburg,VA

Any CheckEngineLight?
Why did you replace the hubs and speed sensor
Any work done before this started?

Jul 21, 2025 | 05:14 PM

Burntable

Thread Starter

Joined: 07-21-2025

Posts: 1

Speedometer fluctuates and transmission changes hard

No codes

Jul 21, 2025 | 06:52 PM

Oldblue

Administrator

Joined: 10-13-2011

Posts: 39,900

From: Welland,Ont Canada

Tighten bolts??

Jul 21, 2025 | 07:52 PM

Burntable

Thread Starter

Joined: 07-21-2025

Posts: 1

Speedometer fluctuates and transmission changes hard

No, do you think I should

Jul 21, 2025 | 07:57 PM

Burntable

Thread Starter

Joined: 07-21-2025

Posts: 1

Bolts

Quote:

Originally Posted by Oldblue

Tighten bolts??

I checked the bolts on the fuse box all are tight

Jul 22, 2025 | 02:59 AM

Burntable

Thread Starter

Joined: 07-21-2025

Posts: 1

Codes

Check engine light is not on

Jul 22, 2025 | 07:14 AM

Burntable

Thread Starter

Joined: 07-21-2025

Posts: 1

I had to start somewhere

Jul 22, 2025 | 02:13 PM

#10

greg8453

Senior Member

Joined: 03-29-2022

Posts: 1,239

From: Davison MI

Quote:

Originally Posted by Burntable

No codes

Did you scan the TCM?

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