Another P0299 while towing thread.........
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,330
Likes: 65
From: 'Pitlock, Maine
Another P0299 while towing thread.........
Let me start by saying I searched the site and read much of what I found but......nothing seemed to match my situation, I was towing my travel trailer this weekend and the CEL came on half way to my destination, I continued on and when I arrived at my campsite, and checked the codes it was the P0299. I cleared the code and ran the truck the remainder of the weekend and then towed my camper back home and have not had the code re-appear yet. The trip one way was about 90 miles of secondary road, up hill and down driving and the truck ran flawlessly both before during and after I cleared the code. I do have a ScanGaugeII but I haven't check the numbers yet due to the fact the CEL has never returned. My question is...do I need to run all the mentioned tests if the code has not returned???
I would also add that I had the truck in Tow/Haul mode to start the trip, I made a stop shortly before the code set and forgot to turn T/H back on so was towing without it when the CEL came on. When I made the return trip I made sure it was in T/H at all times. Has anyone had a similar experience with the P0299? Thanks in advance for any input.....and sorry for the long winded post but I wanted to tell the complete story.
I would also add that I had the truck in Tow/Haul mode to start the trip, I made a stop shortly before the code set and forgot to turn T/H back on so was towing without it when the CEL came on. When I made the return trip I made sure it was in T/H at all times. Has anyone had a similar experience with the P0299? Thanks in advance for any input.....and sorry for the long winded post but I wanted to tell the complete story.
Last edited by Mcrafty1; Sep 1, 2014 at 05:25 AM. Reason: Spelling
Logistics Pro
Joined: Mar 2010
Posts: 3,534
Likes: 497
From: NC
I was pulling my new travel trailer today home from the dealer and my CEL popped on 15 miles into the trip, I was using tow/haul, the truck is running fine. The code is P0299. My Ford tech says to see if it clears itself, sounds like the turbo didn't kick in perfectly one time. It would be interesting to know why the lights luminte on so many of these trucks while towing.
Postmaster
Joined: Jan 2005
Posts: 4,424
Likes: 12
From: BC Canada
Low boost pressure, can be a lot of things, failing EGR valve, dirty EGR valve, dirty sensors like IAT2, EBP, clean MAP and EBP TUbe, MAF needs cleaning, IAT1 if you have one? It can also be a sticking VGT actuator, on the turbo. Your going to have to clean and check a few things amid see what it does. Are you getting any grey or black smoke?
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
IAT1 is intake air temp and is usually, depending on year model, in the MAF sensor. One year, IIRC had no real MAF sensor (05?) and only an IAT1 in the intake. IAT2 is in the drivers side runner front of the intake manifold.
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