Furgasonjr Posted September 11, 2018 Share Posted September 11, 2018 2012 chu 613 speedometer quit working and derated to 1400 rpm. Replaced speed sensor tried accelerator pedal rest ecu and vecu using tech tool and then disconnecting batteries and still no headway.. The computer says to check groind at vecu using pin test kit. Does anyone know which pins to test or if you can test with out a pin kit. Quote Link to comment https://www.bigmacktrucks.com/topic/54247-2012-chu613-speedo-not-working-1400-rpm/ Share on other sites More sharing options...
Thonyb373 Posted June 26, 2019 Share Posted June 26, 2019 Did you fix the issue I have a 06 that’s doing the same thing everything works accept the mileage. Quote Link to comment https://www.bigmacktrucks.com/topic/54247-2012-chu613-speedo-not-working-1400-rpm/#findComment-426195 Share on other sites More sharing options...
Mhtc Posted April 18, 2020 Share Posted April 18, 2020 I would replace the speed sensor on the rear of the trans. Quote Link to comment https://www.bigmacktrucks.com/topic/54247-2012-chu613-speedo-not-working-1400-rpm/#findComment-449132 Share on other sites More sharing options...
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