2015 VOLVO D13 ISHIFT HAS NO THROTTLE AT STOP

JackChicago780 · Jul 15, 2021

twostroke said: ↑

Wondering what the fix was ?
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I have the same exact issue. Did you guys figure out what was causing it to do this?

JackChicago780 · Jul 15, 2021

pmek said: ↑

Hey guys, I got a problem with a truck in my fleet, I was wondering if anyone ever went thru this? So we got a 2015 Volvo VN with a D13 paired to a ishift, the truck has roughly around 700,000 miles, we bought the truck from DOT, so we do not have the full service records of it! Basically the truck runs great when he bobtails, and even when it’s got a light load, but the second the truck hooks up to a heavy load, 35,000lbs+ the truck’s acceleration pedal stops working, even right away when the tractor hooks up to the trailer the acceleration pedal stops working! We at the fleet replaced the main engine harness, we replaced the speed sensor on the transmission, we replaced the leveling valve in the back, checked over everything, there’s no codes. Now the funny part, after a couple times of turning the truck on and off, on and off, the acceleration pedal starts working, it runs fine! Then we the driver comes to a stop or red light with the heavy load the pedal stops working again! The driver has been recently turning it off and on and offf and on, but he found a small hack, he would dump the air out of the air bags, lower them, and the acceleration pedal starts working! Then he raises them and drives off? Does anyone have a clue what this could be?
Click to expand...

Did you guys figure out what was causing the truck to lose the accelerator pedal ?
I have a 2016 780 with 515k miles and it's doing the same exact thing. Only loaded it has problems.

Rajatoor · Jun 9, 2022

JackChicago780 said: ↑

Did you guys figure out what was causing the truck to lose the accelerator pedal ?
I have a 2016 780 with 515k miles and it's doing the same exact thing. Only loaded it has problems.
Click to expand...

Do you find your problem, i get the same in my truck plz let me know

QUALITYTRUCK · Jun 9, 2022

Guys listen. The Ishift transmission is great when working properly. Multiple things can cause the same symptom. Without PTT software it can not be diagnosed properly. A leaking $5 air fitting can cause the same issue as a fried $3000 TCM. The Ishift is one piece of equipment that needs an experienced tech (Nasriza) amongst others and a laptop.

pmek · Nov 15, 2022

Hey guys! Sorry for no response. The issue ended up being in the parameters!! One of the techs when changing the vehicle speed, happened to touch one of the vehicle speed factor, or load factor I believe it’s called! And the truck was having issues! So make sure in techtool and parameter programming that someone didn’t accidentally change a parameter they shouldn’t have

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