I have an appt with my Ford dealer tomorrow morning to check out my 2016 F250 6.2 truck. I wanted to start this post to document the issue(?) in case someone has something similar happen.

About three weeks ago, just driving at 40 mph, I thought I felt the truck downshift, but it was more like someone turned something off. The truck just feels sluggish now. The exhaust note is slightly different. The truck has power, but it just takes longer to get up to speed, almost like I am running into a constant headwind. In fact, I have to slightly apply the gas to maintain speed going downhill at 65 mph. Another way to describe it is it feels like I am in 25% limp mode. MPGs remain normal (~13 @ 60 mph hiway). All fluids are normal.

I will report back with the results from the dealer.

 

Pure speculation of course but might be like ibewashincars when he broke a rocker arm or valve spring.

 

Brought the truck in this morning. Tech says it is the throttle body. This makes sense since it seems like the TB will not open all the way no matter how hard you press the gas. A new TB is on its way from Ford with an ETA of Wednesday. Ford says I can still drive the truck - it is not causing any damage other than a nuisance.

More reports to come.

 

TB arrived at the dealer. Email said throttle body assy and MO. Not sure what MO is. I have an appt on Thursday to install. Will report back.

 

UPDATE:

Today the dealer replaced the TB. Truck runs much better. Power is back at least on city streets. I will take it out on some highway merges to see how it feels. The real test will be towing my camper. Last weekend the truck struggled to maintain 60 mph on a slight grade. FWIW here is the text from the invoice for the warranty work:

CUSTOMER STATES TRUCK LOSING POWER. HAVE TO APPLY MORE GAS ON
DOWNWARD HILLS JUST TO MAINTAIN SPEED. NO ENGINE LIGHT OR CODES. THE FASTER YOU GO THE MORE NOTICEABLE.

TEST DRIVE VEHICLE TO VERIFY CUST CONCERN . FOUND VEHICLE
LOSS OF POWER AND T-BODY IS NONE RESPONSIVE . WRENCH LIGHT
AND CHECK ENGINE LIGHT CAME ON . TEST FOR CODES FOUND P0122
AND P0123 STORED IN SYS . PERFORMED PIN POINT TEST DV PER
CODES . PIT MONITOR TP SIG. FOUND NONE RESPONSIVE .
Correction 0.2 23.29

TEST AND INSPECT WIRE HARNESS CIRCUITS: ETCRTN, ETCREF, TP1,
TP2, TACM+, AND TACM-. PASSED . AT STEP 20,REPLACED T-BODY
CLEARED CODES RETEST SYS . TEST DRIVE VEHICLE TO VERIFY
REPAIR . PASSED

 

Thanks for keeping us all updated on this issue.