Truck "bucks" at slow, steady speeds

[Msfitoy]

My 2019 Ranger bucks also . Paid $159 for diagnostic. Found theDPFE sensor needs replaced. $495. I said I’ll wait. I googled it. Part is $80. Now, don’t know anything about it, but are they that hard to replace?

Hi Stuart, please check post #88 on page 6...

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[ppfd]

Buy the part from Levittown ford, I believe they are a sponsor.
Mine was a replaced under warranty and the bucking, surging disappeared

 

[tshrop]

I have a 2020 Lariat FX-4 with around 6100 miles on it. I'm about 5 miles from work and most of my drive is in the 25 - 35 MPH range.

You probably don't have anything wrong with your transmission.

FORD NEEDS TO REPROGRAM THE TRANSMISSION SHIFT POINTS AT SLOWER SPEEDS!!!

Something you can try. Put the transmission in DRIVE and push the the manual shift button on the side of gear shift stick up or down. You'll see on the right display what gear the transmission is in (this will not shift the transmission unless you're in MANUAL). When I'm going around a steady 30 mph; the transmission on my truck goes to 7th gear (too high for this speed in my opinion). This is more than likely why you're also having that bucking feeling. The RPM drops too low and the transmission will not shift down unless you accelerate. The only thing you can try to stop the bucking feeling is to put the transmission in MANUAL and shift to 5th gear (or maybe 6th gear at the most). The engine will run around 2000 RPM and you'll be around 30 - 33 MPH. Put back in DRIVE when slowing to stop or manually down shift and repeat. Yes, this shouldn't need to be done and is a royal pain in the @$$. Something else you'll notice is the transmission will shift from 1st to 3rd gear under normal acceleration skipping 2nd gear.

Hope this helps ?

Comments are spot on. I have a 2019 Ranger that does exactly the same thing even after the TB was completed.

 

[Big Blue]

Comments are spot on. I have a 2019 Ranger that does exactly the same thing even after the TB was completed.

Have you tried changing the DPFE sensor? This has help most people with this problem. It is probably not a transmission issue.

 

[tshrop]

Have you tried changing the DPFE sensor? This has help most people with this problem. It is probably not a transmission issue.

 

[tshrop]

I haven’t but I’ll look into it

 

[Flymac1]

My 2019 Ranger bucks also . Paid $159 for diagnostic. Found theDPFE sensor needs replaced. $495. I said I’ll wait. I googled it. Part is $80. Now, don’t know anything about it, but are they that hard to replace?

Small update- Is the DPFE affected by moisture by chance. The reason I ask is, we’ve been in a drought for a while and for the last few days my truck is not bucking but once in a long while. Just a thought. BUT, I did order the part from the Ford Dealer that was mentioned and it came today. I took the truck to my normal repair garage and he said he would change it out for ,get this, $30.00 labor. Said it would be about a 20 min job. So what’s the deal with Ford saying $495.00??

 

[airline tech]

Small update- Is the DPFE affected by moisture by chance. The reason I ask is, we’ve been in a drought for a while and for the last few days my truck is not bucking but once in a long while. Just a thought. BUT, I did order the part from the Ford Dealer that was mentioned and it came today. I took the truck to my normal repair garage and he said he would change it out for ,get this, $30.00 labor. Said it would be about a 20 min job. So, what’s the deal with Ford saying $495.00??

Yes- Water Vapor in the exhaust is a by-product of combustion, so there will always be some moisture. But the Dew Point (Ambient Temp) plays a role in how much moisture content is actually in it.
Over time, since the moisture content is actually acidic - it breaks down the sensor membrane in the DPFE. This is when you start seeing symptoms.

My Labor Guide - Shows (0.3) Labor Hours plus Part Cost - So yes $495 is way overcharging, even with doing a drivability Live Data check (after repair) - it is still rather high.

 

[RangerBill]

Small update- Is the DPFE affected by moisture by chance. The reason I ask is, we’ve been in a drought for a while and for the last few days my truck is not bucking but once in a long while. Just a thought. BUT, I did order the part from the Ford Dealer that was mentioned and it came today. I took the truck to my normal repair garage and he said he would change it out for ,get this, $30.00 labor. Said it would be about a 20 min job. So what’s the deal with Ford saying $495.00??

Some that have replaced the DPFE sensor have seen moisture or water droplets in the sensor ports that seems to have caused the issue.

 

[Flymac1]

Thanks for your response. Where would it come from and is there some type of filter that could be added?

 

[ctechbob]

Thanks for your response. Where would it come from and is there some type of filter that could be added?

I've theorized that you could put a (small) desiccant pack in there. So long as the pressure fluctuations could get through freely it seems (in my mind) that would work. Haven't tried it though.

 

[Flymac1]

Don’t know which tube is intake, but was thinking possibly no more than a inline fuel filter

 

[briansco]

Just changed the DPFE sensor in my 2019 Ranger. It has had a rough idle for about 30 secs when it was cold for quiet a while. Dealer could not find it but it was annoying but not a bad problem. Then the 1000 rpm shudder/surging issue began about 2 weeks ago during a real rainy/humid spell of weather. I changed the sensor and it fixed both problems. Wish I had knows this a couple years ago!

 

[Flymac1]

Small update- Is the DPFE affected by moisture by chance. The reason I ask is, we’ve been in a drought for a while and for the last few days my truck is not bucking but once in a long while. Just a thought. BUT, I did order the part from the Ford Dealer that was mentioned and it came today. I took the truck to my normal repair garage and he said he would change it out for ,get this, $30.00 labor. Said it would be about a 20 min job. So what’s the deal with Ford saying $495.00??

Update. Had the DPFE sensor replaced. It started out great. Thought problem was solved. It within a few stop and starts it started again. But not as often. I got on it up to about 4000 RPMs, to keep from a simi running me over and lo and behold it started running g very smooth for a couple days. Don’t know if that had anything to do with it or not. Then it started over again but still nothing like it was before it was replaced. So I guess I’ll just live with it. TSB-19-2052 addresses this problem I believe for Rangers built before 11 Feb 2019. Mine was Nov 2019. Oh well!

 

[Chuck Dragisic]

Anyone get this issue fixed? Mine started doing this, this week, after a trip to Austin. Truck has 53,000 miles. Wondering what the fix is? Inquiring minds want to know......

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