Why does my Peterbilt doesn't goes faster than 45 miles, what could be ?Peterbilt 378 Tractor Truck?
What year?
blocked air or fuel filters, low compression, weak fuel pump, bad fuel,bad turbo or exhaust,you need to up shift, someone set the governor limit to 45. .Peterbilt 378 Tractor Truck?
On an older truck I'd say it was a plugged fuel filter.Newer trucks have just as many sensors and computer systems as cars.You're best bet is take it to a shop.Peterbilt 378 Tractor Truck?
There may be something wrong with your fuel delivery or your exhaust may be plugged. Check your turbo.
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