P1299 Cylinder Head Overtemperature Protection Active : No Overheating

[syasar]

My 2014 ST goes into limp mode sometimes and throws P1299. The car by no means is overheating with coolant temperature around 100C - 110C. The code usually comes on after the car parked, never right in the middle of a drive. Already changed the ECT sensor, and the car doesn't actually have a CHT sensor to replace so the code is coming from the cylinder head actually overheating. This issue has been happening for over 5 years now, usually between more often during seasonal temperature changes when it get suddenly very hot or cold. I just learned to live with it, got the clear to code on the side of the road then get going and hope it does come up again and put the car in limp.

Where do I even start? Has anyone had this issue and resolved it.

I made a post about this a long time ago about the same issue.

Reference Post: https://www.fiestastforum.com/threa...rheating-how-do-i-test-the-signal-wire.27419/

 

[scooter123]

I would suggest that you drain the cooling system by removing the bottom radiator hose and then remount that hose. Then use a Vacuum filling device and fill the system per fords specific instructions. As for why, it may be that you have a large bubble of air trapped in your cylinder head.

 

[14BeanST]

@syasar I also own a 14 ST and Ive been experiencing this issue for a few years as well. I'm on the east coast and notice that the car wont go into limp mode during the winter seasons but as soon as it warms up it will start acting up again. I'm thinking that Ford might've butchered my last coolant flush and i have an air bubble in the system. If it isn't that then it has to be electrical but i already replaced the Coolant temp sensor. If you found a solution to your problem let me know!

 

[madhatter]

Bleeding these cars isn't that difficult. what is the level in the overflow resivoir? have you had the recall done?

 

[14BeanST]

Yup the recall was done on my car. When I got the car back from ford it was full but when I drove the car home and checked it was below min so I filled it up with fords yellow coolant. Maybe some air got into the system on the drive back home but I haven’t had real heating issues with the car. I’m gonna bleed the system today and see if that helps.

 

[madhatter]

my guess is they didn't run the heater while bleeding it at the dealer. i'm betting once you refill you're good.

 

[MHBGT]

My 2014 ST goes into limp mode sometimes and throws P1299. The car by no means is overheating with coolant temperature around 100C - 110C. The code usually comes on after the car parked, never right in the middle of a drive. Already changed the ECT sensor, and the car doesn't actually have a CHT sensor to replace so the code is coming from the cylinder head actually overheating. This issue has been happening for over 5 years now, usually between more often during seasonal temperature changes when it get suddenly very hot or cold. I just learned to live with it, got the clear to code on the side of the road then get going and hope it does come up again and put the car in limp.

Where do I even start? Has anyone had this issue and resolved it.

I made a post about this a long time ago about the same issue.

Reference Post: https://www.fiestastforum.com/threa...rheating-how-do-i-test-the-signal-wire.27419/

What was the outcome, did you refill the reservoir and that solved it (trapped air pocket)?

From what I recall about the "recall", the new coolant reservoir includes a level sensor. This is what actually triggers P1299 on our cars, as we do not have an actual Cylinder head temperature sensor on the older engines, the protection is triggered by a low coolant level condition.

 

[14BeanST]

I bled my system last week and the car seemed fine until the weather got warmer. My car continue to go into limp mode so I decided to take the car to ford. Initially the service department told me that “spirited driving” for long periods of time will throw the car into limp but in my case the engine will be stone cold and still go into limp. I didn’t like that answer so I talked to the tech who has thankfully performed the recall work way in the past and his opinion is that the recall work was done incorrectly. Either that or he thinks that the wire they install from the coolant stand pipe to the pcm has shorted or been damaged. I will take the car back next week and leave it with them so they can view the issue first hand. So far I’ve had to pay nothing but that was after I caused a scene about having to pay a $200 diagnostic fee for them to tell me nothing is wrong. Updates will come soon

 

[M-Sport fan]

^^^Which dealer, (so I know to avoid them)?

 

[Sam4]

you may want to get that mechanic's number and see if he wants to drink your beer this weekend.

 

[14BeanST]

Quick update the tech found the problem. The wire that is spliced in for the recall work was just tied together and not wrapped up with electrical tape causing the wire to be loose. Due to the recall work being done incorrectly they are contacting the other dealership that performed the work to see if they will pay for the labor. I’m not sure what will happen or if a ford rep will be involved but we will find out.

 

[madhatter]

wow. i'm glad they found your problem! I have no clue how someone who does this stuff for a living can be bad at something this basic, but when i took mine in, they botched it also. I doubled up with the door lock recall, and between wires hanging down and shittily spliced in my footwell, and the general mouth-breathing-dumbass-lack-of-attention-to-the-job, i had to reconnect 2 windows, one side mirror, and re-do one door latch as well as resplice wires, re-zip tie it up under the dash, and burp the coolant level. bottom line, the ONE time i take it to Ford for something, it's botched spectacularly. I left them a negative review, and they spent the next couple weeks trying to get me to change it, without actually trying to make even one thing right.

 

[14BeanST]

wow. i'm glad they found your problem! I have no clue how someone who does this stuff for a living can be bad at something this basic, but when i took mine in, they botched it also. I doubled up with the door lock recall, and between wires hanging down and shittily spliced in my footwell, and the general mouth-breathing-dumbass-lack-of-attention-to-the-job, i had to reconnect 2 windows, one side mirror, and re-do one door latch as well as resplice wires, re-zip tie it up under the dash, and burp the coolant level. bottom line, the ONE time i take it to Ford for something, it's botched spectacularly. I left them a negative review, and they spent the next couple weeks trying to get me to change it, without actually trying to make even one thing right.

Exactly! It blows my mind that consumers have to pay out the asshole just to have the car in a worse state before sending it in. Although it’s nice that you had the knowledge to go back and resplice the wires together. I can turn a few wrenches here and there but when it comes to electrical I’m not gonna bother messing my car up even more lol.