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My 2003 GMC c4500 speedo says that I am going 85, but im at…

Customer Question
My 2003 GMC c4500...

My 2003 GMC c4500 speedo says that I am going 85, but im at about 35.

Mechanic's Assistant: What is the model of your '03 GMC?

Likely a Topkick

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

I will be. I just dont really have an idea where to start. Im pretty clueless on electrical

Mechanic's Assistant: Have you checked the battery, particularly the terminal connections? Are they corroded?

No. I just put brand new batteries in about 2 months ago.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

It started after I used it to jump start another truck.

Submitted: 8 months ago.Category: GMC
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Answered in 8 minutes by:
9/20/2017
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 8 months ago
david craig
david craig, Owner/[email protected] 3D Atuomotive
Category: GMC
Satisfied Customers: 5,383
Experience: owner/mechanic at 3D Automotive
Verified

Hi Im David, thanks for visiting the site. disconnect the negative battery cable for 10 seconds. reconnect it, turn the key on, make sure the speedo does a good sweep then see if that takes care of the issue

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GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 8 months ago

are you there?

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