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Rpm surge at highway speed

M

MrNickel

New Member
Aug 4, 2023
6
0
Truck Year
2016
Hello all, my 16 eco deisel seems to have rpm surge at highway speed. It’s about 200 rpm on gauge , I am thinking transmission is down shifting for a split second ? I tried with or without cruise, in tow haul mode and downshifted it to 7 and it still does it. Could it possibly be tps , or should I service transmission?
 
C

CAVEMANN

Active Member
Jan 5, 2020
388
129
Truck Year
2017
If you use the shift buttons and shift up so the gear shows on the dash you can observe what gear it's in. Y could also force a downshift to 7th to see if it persists, it may be the torque converter unlocking and locking, or the AC compressor cycling.
 
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