I am posting to the group on behalf of my son who owns a 2017 1500 4x4 with 170K miles. His issue is a little difficult to describe in words but I'll try.
When driving at highway speeds (interstate) and holding the throttle steady, he will occasionally notice that the engine speed (revs) slightly increase from 1800 to just under 3000 rpm when the truck is going down hill but he is not gaining speed. When he presses on the gas pedal slightly, the revs increase (and so does vehicle speed) but it feels like the transmission has shifted into the next lower gear (7th) and won't upshift to 8th. So imagine your cruising along at 70MPH with steady throttle applied and the road grade declines to a downward slope and without applying any more throttle, the engine speed increases. Yes his check engine light is on but the only code(s) retained per the dude at AutoZone was a loose gas cap.
So after replacing the gas cap I went for a ride with him and my observation was that the transmission upshifts and downshifts normally (quite smartly actually for 170K miles) with no latency between gears and at predictable speeds/conditions.
Has anyone else experienced such a drivability issue?
Thanks, Mike
When driving at highway speeds (interstate) and holding the throttle steady, he will occasionally notice that the engine speed (revs) slightly increase from 1800 to just under 3000 rpm when the truck is going down hill but he is not gaining speed. When he presses on the gas pedal slightly, the revs increase (and so does vehicle speed) but it feels like the transmission has shifted into the next lower gear (7th) and won't upshift to 8th. So imagine your cruising along at 70MPH with steady throttle applied and the road grade declines to a downward slope and without applying any more throttle, the engine speed increases. Yes his check engine light is on but the only code(s) retained per the dude at AutoZone was a loose gas cap.
So after replacing the gas cap I went for a ride with him and my observation was that the transmission upshifts and downshifts normally (quite smartly actually for 170K miles) with no latency between gears and at predictable speeds/conditions.
Has anyone else experienced such a drivability issue?
Thanks, Mike
