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Rpm surge at highway speed


New Member
Aug 4, 2023
Truck Year
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?


Active Member
Jan 5, 2020
Truck Year
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.