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Speedometer not working

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Old May 28, 2019 | 08:53 PM
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Originally Posted by Huggerbugger
Perhaps he swapped out the ecm and the ecm thinks you're trying to alter the Odo.
The thundmax tuner is an entire ecm replacement.
 
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Old May 28, 2019 | 08:54 PM
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Originally Posted by Jay Guild
Also continuity test from the speed sensor to the ecm
I checked for the voltage going to the speed sensor and the ground for the speed sensor. I got 5v going to the speed sensor and the ground was good.
 
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Old May 28, 2019 | 09:07 PM
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Originally Posted by nhcrtr
I checked for the voltage going to the speed sensor and the ground for the speed sensor. I got 5v going to the speed sensor and the ground was good.
There is a third wire that sends the signal back to the ecm
 
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Old May 28, 2019 | 11:53 PM
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I know that the mileage is contained in the BCM, so I'm thinking that all speedo functions are controlled there also, that's where I'd be checking since you have BCM fault codes.
 
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Old May 29, 2019 | 09:41 AM
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When you replaced the speedometer did the new one load the same odometer reading as the old one?
 
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