Ford Excursion :: 2001 - Code P1299 - Cylinder Head Overtemp Protection Active


Aug 13, 2017

2001 EX 4WD 6.8l ... Just finished an engine rebuild and have a single DTC showing that I am having a problem isolating. In short: P1299 Cylinder Head Overtemp Protection Active. I have new sensors all around however. I have run a separate ground to the intake manifold to rule out bad ground. I have cleaned all ground connections otherwise. After clearing codes and start from cold, the issue does not occur until the engine warms up. I was seeing temps over 250 F on my scantool.

I pulled the thermostat and ran from cold... took a lot longer, but the condition eventually occurred. Scantool shows temp of 255.2 when protection kicked in. However, the engine, radiator, intake manifold all just slightly warm to the touch, barely no heat coming through the HVAC system. So, I do believe I had a new bad thermostat in the mix, but why do I still throw a code for the high temp. Temp gauge sits at Cold the whole time. Here's the catch, if I disconnect only the air coolant temp sensor, the problem does not occur, the engine runs like a kitten.

Key On, Engine off, the coolant temp gauge goes right to Hot and stays there. When the problem first started, the coolant temp gauge started going back and forth between Cold and Hot repeatedly. I have replaced that particular sensor twice to rule out a new bad sensor. Key on, engine off; with new sensor reads 185 ECT temp. Original sensor read 318, first replacement read 257. This third sensor is the only one that actually registers changing temperatures.

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Ford Super Duty (1999-2016) :: 2005 F250 - CEL Code P1299 For Cylinder Head Temperature Sensor

(The truck is a 05 f250 with a 5.4l). The problem first started out with the engine temperature gauge spiking and then resetting itself when the truck is turned off and then turned back on. If I drove the truck for any distance it would go into limp mode and the CEL would come on. The code was p1299, which is the cylinder head temperature sensor, and I replaced the sensor but no luck. Then the shop and I went through all accessories hooked up and couldn't find a short until I remembered that my prodigy break controller would occasionally read "ol" or "sh" which both readings are from shorts. I tow a enclosed trailer about 85% of the time and the past week I have been towing it with a different 250 and the same break controller without a problem so I have eliminated the trailer. But the shop just said the problem was the controller and unhooked it.

Now the next day it threw the same code with the controller unhooked and the trailer hooked up. after thinking it seemed that it was happening when i accelerated so I took apart the 7 pin and sure enough there was a little water in it, but after driving it around for a little and no code being thrown I hooked my break controller up and it still was showing ol or sh so i believe there is still a short. Also I noticed that my voltage is reading right at 13v instead of the 13.8-14v it was reading before this issue arose. I think I have narrowed it down to the 7 pin harness and/or electrical in the break components, but do not know what would loop back to the temperature sensor.

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Ford F-150 - 1997-2003 :: Getting Code P1299 With Plenty Of Coolant

I'm getting a p1299 code..it has plenty of coolant in it..what's the next step I should do to address the problem?

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Ford F-150 (2004-2008) :: P1299 Code - Won't Start - Turn Over But Not Firing?

Just went out to start the truck (2006 4.2L) and no start...turns over but isn't firing.

I checked codes and got a P1299. She was stone cold and ran perfectly last night - never overheated.

I suspect ground or other wiring...where should I start?

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Ford Super Duty (1999-2016) :: 2003 5.4 F250 Head Gasket / Misfire Code On Cylinder 4?

After replacing most of the underside of my Super Duty, Complete front end, backing plates, brakes, rotors and shocks, I have a misfire code on cylinder #4. I replaced the plugs, cleaned the MAS and filter and rotated the coil to cylinder #1. Still have a misfire on #4 and noticed the coolant slightly low and some condensation on the oil cap. Could this be the intake gasket? My mechanic is away for 2 weeks and I think the price at the dealer will kill me. I have 63K on the truck, don't tow and plow mostly family members. It's getting a little rusty but is still in good shape.

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Toyota ticked me off. I had them repair the ac on my Prius and during this time I read bleeding the inverter coolant can be a pain. They said they would flush and fill the inverter coolant for me. Over the weekend I get a P3130 error saying inverter overtemp. I did not have "turbulance" in the reservoir when I first bought this car and didn't know much at the time. Now, with getting the code I looked into this deeper. I told Toyota that this repair had been skipped and they denied it. Ends up the fluid was lower than it should and the tech said the pump wasn't working. "How did you bleed the system then". They gave me 2 gallons of coolant and I told them I will repair this myself now.

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Ford Super Duty (1999-2016) :: Engine Temp Gauge Pegged Out And CEL Came On - P1299 Code

My truck threw a code p1299 last night on my way home from the lake. I was towing on a huge grade and all the sudden my engine temp gauge pegged out on me and check engine light came on. I pulled over and noticed a bunch of coolant had overflown the cap but the engine didn't seem to have over heated. When I restarted the truck the engine temp was immediately normal range. I drove for another 30 min or so and the engine temp started to climb and then come back to normal then climb and stay pegged. I pulled over again and noticed the coolant level was low and coolant had overflown the reservoir. I restarted the truck and once again it was normal. I just drove surface streets the rest of the way with no issue. I suspect blown head gasket. This is a 2003 F-250 6.8L with 100000 miles.

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Ford Excursion :: Misfire - Code P0359 For Coil On Cylinder 9

I recently bought a 2002 Excursion limited v10. It's got a couple of issue, mostly small stuff. The biggest is that it recently developed a pretty bad misfire. The code I'm getting is p0359 which is for the coil on cylinder 9. So I changed that and I'm still getting the same code. I took it to the shop and they're saying that they are not getting a signal on the wiring harness for cylinder 9 and they think that it needs a computer. They want to check all the wiring first to eliminate the possibility of a short or bad connection. My question is, if the coil somehow shorts out against the block, can that burn out the computer?

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Ford Excursion :: Service Engine Soon Light Came On - Cylinder 1 Glow Plug Code

2001 Excursion Service Engine soon light came on, took it to Auto Zone, said #1 cylinder glow plug. I have a Superchips tuner, can I diagnose it with it? Which is the #1 cylinder?

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Ford Excursion :: 2000 V10 - Rough Idle - P0304 Code / Cylinder 4 Misfire

I recently bought a 00 Excursion v10 2wd everything looked right no major problems. I noticed it has a rough idle and i thought it could be the EGR i went under the hood and there's no EGR in sight. I plugged the OBD reader to see if it would give any codes since the there was no check engine light on and wanted wanted to make sure it worked, It showed a P0304 code its Cyl4 misfire i checked plugs/coils and i noticed there's a little insert inside Cyl4 plugs hole in the head that it has the plug screwed on. I decided to change all the plugs and the coils and i still have the rough idle and code i can hear a ticking noise around the engine in the passenger side.

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Ford Excursion :: Code P0304 Cylinder 4 Misfire - Broken Rocker Mount

6.0 .... Have a code Po3o4 Cyl 4 misfire. I pulled the valve cover to remove the injector and found the right half of the rocker mount and rocker arm laying in the head. What may have happened?

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Ford Excursion :: 2001 2WD Won't Start / Key Spins In Cylinder

I have an 01 2wd with 6.8L, 149K and had her for about 3 years now. Today I went out to leave work, inserted key and went to turn it on. As I reached the say 3/4 position all the dash lights came on as usual and then I heard a small "click" sound as I finished turning the key, then is just went loose. The key now has no resistance. it just sort of "free spins". not all of the way around or anything. She did not start and the dash lights are still on. Had to disconnect the battery to get dash lights off.

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Ford Excursion :: 2001 V10 - P0303 And P0307 Codes / Misfires On Cylinder 3 And 7

So on Christmas day I turned on my truck and all was well. I had family over and we were going up to my range to do some Christmas day target shooting. I let it warm up for about 20 minutes we then loaded up and headed out.

When I locked the hubs I soon found out my 4WD was not working? Due to the cold? It worked fine last time out and now not at all. I decided to forge ahead in 2WD, Sure enough we got stuck in deep snow. I had to gun the engine off and on to get out and as soon as I broke free (CHECK ENGINE) appeared for the first time ever. Worst Christmas ever!

The truck is running fine, full power and no irregular noise from the engine. So I ran the test and P0303, P0307 misfires on cylinder 3 and 7 appeared. This whole post is about me doing a full tune up this spring the truck is parked since Christmas and will stay parked until I do a full tune up.

New Plugs.
New Wires.
New Coils.
New oil filter and oil. Changed last year with less than 2000 miles but changing anyways.
Flush radiator and add new radiator fluid.
Clean air filter (Aftermarket, It is washable).

Is there anything I'm missing? Also, any tips on figuring out the 4WD issue?

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Ford - Escape :: 2001 - Misfire On Cylinder 4 / P0304 Code

I know I can fix this problem, but my question is which cylinder is #4? I don't see it marked on the engine. The counter guys at both my local parts supply stores (whose initials are A and O) can't even look it up for me. If #4 is on the front of the engine, then it's an easy fix. If it's on the backside, then the intake manifold has to come off to get to the plugs and coil packs. It's a bit more labor. I can do it, but I'd rather not have to.

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Brought home tonight a 2001 Ford Escape 3.0L 24 Valve V6. Bought it from a mechanic who's customer didn't want to put any more money into it. Has 185000 miles on it and it throwing the P0303 & P0171 codes. Cylinder 3 miss and Lean condition bank1.

Mechanic thinks it is a valve seat in the cylinder head next to the fire wall. Before I start replacing the cylinder heads with new remanufactured heads I plan on doing a compression test and leak down test.?

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Ford Excursion :: 2001 - Got SRS / Airbag Code?

I have suddenly acquired a new value added feature to my X. An airbag warning light flashing code 18. Through the research I have found it is either a pretensioner issue or a short. Would like to know for sure what it is.

It is a 2001 LTD 5.4L.

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I have searched and found a few threads of folks getting a p0720 code and truck revving and dying. Just wondering how to resolve the issue and what the cause was. I have an 01 ex with v-10

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Ford F-150 - 1997-2003 :: Best Way To Clean Cylinder Head?

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Intrepid :: 2001 SE - Misfire In Cylinder 4 (Code P0304)

Have '01 SE. yesterday I got a misfire in cylinder 4 (code P0304) the service light blinked on and off 3 to 4 times than stayed solid. changed plugs and boots about 1 to 2 months ago, didn't change coils and they r not in the best shape but didn't have money to replace at time. So I replaced the coil for #4 and it still runs rough with code, plug has some ware but looks fine.

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