Drivetrain Questions and info regarding transmissions, clutches, etc.

P1721 speed sensor issue???

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Old Aug 26, 2024 | 08:06 PM
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Melmel's Avatar
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Coupe
P1721 speed sensor issue???

Im having a speed sensor issue with my g35 coupe 2007 a/t while monitoring the car with my scanner it shows erratic vehicle speed, I’m unsure as to which sensor or sensors are in control of this speed, below is a picture where it shows my car going at “150 mph” when in reality I’m only going about 40 mph.

at first I thought it would be the internal speed sensor located in the transmission, but I am able to go into manual mode and also cruise control works, any help would be much appreciated.


 
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Old May 20, 2025 | 09:19 AM
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What happened then ?
 
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