false overheat indication code P1299
New User
Joined: May 2012
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false temp
hey guys new to the site but having the same problem with my 2002 e250 van 5.4 v8 my temp pegs to hot then the engine goes to its self cooling mode and somtimes the guage jumps up and down and the truck completely shuts down i know its a safety feature but the truck is not over heating this happened last summer but stopped all winter put 20000 miles on it this winter and never had a problem but this summer its happening again but worse changed head sensor ,thermostate, and another temp sensor but still same issue at first i would just shut the truck off and start it again and it would be fine but now once it peggs it stay there for up to 4 or 5 hours of not running im so confused on were to go next if anybody can help let me no if not its going to my mechanic but hell he doesnt seem to have any ideas neither thanks for listening and if i figure it out ill let you know
New User
Joined: May 2012
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Stumped on p1299 code
Hi! New member with some trouble. We have a 2003 F-150 super crew with the triton V-8.<148,000> all fluids good, changed the thermostat. Checked code P1299. Understand the why, but what do I replace? Temp. sending unit? Sensor on the cylynderhead? Not as easy as my '68 Taledaga I had in high school.
New User
Joined: Apr 2012
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Just wanted to ressurect this thread-
I have a 2000 Ford Excursion 5.4, same issues as everyone else-
Ford dealership tried to screw me, they recommended radiator, 02 sensor, and the guage sensor, and thermostat-
I paid them the 70 bucks for the eval, then I replaced all of the parts, still no luck. I took it to my buddy who is strictly a chevy dude, he checked it out for a few days, and came back and said 9 times out of 10 in his expereince, I have a cracked head.
I am now looking to replace the engine. Any thoughts or updates?
BTW still reading 1299 overhed temp guage, still getting limp mode after 10 minutes of driving, still runningt hot, after a restart it all goes away
I have a 2000 Ford Excursion 5.4, same issues as everyone else-
Ford dealership tried to screw me, they recommended radiator, 02 sensor, and the guage sensor, and thermostat-
I paid them the 70 bucks for the eval, then I replaced all of the parts, still no luck. I took it to my buddy who is strictly a chevy dude, he checked it out for a few days, and came back and said 9 times out of 10 in his expereince, I have a cracked head.
I am now looking to replace the engine. Any thoughts or updates?
BTW still reading 1299 overhed temp guage, still getting limp mode after 10 minutes of driving, still runningt hot, after a restart it all goes away
New User
Joined: Jul 2012
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I just had this exact problem last month and all signs pointed to bad head gasket at first.
I pressure tested my system and it held 18 lbs of pressure for over 30 mintues so I decided to test my pressure cap for the radiator just to check it.....No pressure was held at all.
I flushed the system and replaced the thermostat since it needed it anyway, AND put a new cap on the system and have not had any problems since. Code p1299 has not come back yet either.
I pressure tested my system and it held 18 lbs of pressure for over 30 mintues so I decided to test my pressure cap for the radiator just to check it.....No pressure was held at all.
I flushed the system and replaced the thermostat since it needed it anyway, AND put a new cap on the system and have not had any problems since. Code p1299 has not come back yet either.
New User
Joined: Sep 2012
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Me too...
I have a 2000 Navigator with 190k. I get all the problems. Temp gauge flies up, temp light comes on, and if I don't turn the engine off and restart, it will go into limp mode.
Usually, when I restart it, the gauge goes right back to normal.
I have not recently done any work to it, It doesnt seem to matter what the outside temp is. The first time I had it happen was pulling a pretty heavy trailer with a bad ground (as mentioned in this string earlier), but now it happens almost every time I drive it.
Usually, when I restart it, the gauge goes right back to normal.
I have not recently done any work to it, It doesnt seem to matter what the outside temp is. The first time I had it happen was pulling a pretty heavy trailer with a bad ground (as mentioned in this string earlier), but now it happens almost every time I drive it.
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New User
Joined: Oct 2010
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From: Ontario
I found a fix for the false overheat. The cylinder head temperature sensor caused my issue with the gauge spiking and engine going to safe mode. If your sensor is on the left bank front (driver's side) it can be replaced without removing the intake manifold. Let me know and I'll tell you how to replace it.
Guage
Guage
New User
Joined: Aug 2012
Posts: 4
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Hi yall, im workin on a 99 f250 V10...spuratically getting a 1299 code and limp mode NO overheating issues...checked with lasor... today i will change CHT sensor, check wiring harness..anything else i should look for if im not successful ? thanks again!
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Joined: Apr 2012
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Just wanted to add on top of the code, I am now unable to start my excursion- I try to crank it up and nothing, both starter and alternator are in good shape? Anybody have any suggestions?
I hate to say it but this truck has been a headache since I got it
I hate to say it but this truck has been a headache since I got it
New User
Joined: Nov 2012
Posts: 1
Likes: 0
I found a fix for the false overheat. The cylinder head temperature sensor caused my issue with the gauge spiking and engine going to safe mode. If your sensor is on the left bank front (driver's side) it can be replaced without removing the intake manifold. Let me know and I'll tell you how to replace it.
Guage
Guage
New User
Joined: Aug 2012
Posts: 4
Likes: 0
Hi Guys,
im working on the same problem on a V-10...No overheating (according to temp gauge) Changed the CTS...still code returns and Limp mode is activated...only on warm days ! vaccumed and pressure filled cooling system.. tested electrical signals and grounds, infared gauged (temp) entire engine and cooling system (right after code set ) AND STILL NO LUCK !!! When i figure it out ill post here....You all have helped me lots in the past . Thank You ,
Ed, Scoggins Mobile Automotive, LA CA..
im working on the same problem on a V-10...No overheating (according to temp gauge) Changed the CTS...still code returns and Limp mode is activated...only on warm days ! vaccumed and pressure filled cooling system.. tested electrical signals and grounds, infared gauged (temp) entire engine and cooling system (right after code set ) AND STILL NO LUCK !!! When i figure it out ill post here....You all have helped me lots in the past . Thank You ,
Ed, Scoggins Mobile Automotive, LA CA..