Codes p1289 and p1289?

2005 FORD F-150
156,000 MILES • 5.4L • V8 • 4WD • AUTOMATIC
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DREW402
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My temperature gauge and don’t work working coolant gauge sits a cold. I replaced the cylinder head temperature sensor and now I have no check engine light on but still no coolant gauge or A/C?
Oct 11, 2023 at 8:27 AM
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STRAILER
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P1289 is related to the cylinder head temperature sensor signal being out of the expected range, and P1289 is a manufacturer-specific code for the same issue.


Here is the location of the PCM so you can send it in to be checked. Check out the images (below). Please let us know what happens.
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Oct 11, 2023 at 8:45 AM
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DREW402
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Thank you, I will let you know what I find out. Also don't know if this helps at all but after turning off the vehicle and turning it back on the temperature gauge reads normal then drops to c after a minute or two and gets the p1289 code again.
Oct 11, 2023 at 9:15 AM
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STRAILER
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Yep, it sounds like the driver that monitors the temperature gauge process is failing and needs to be reset to start working for a short time.
Oct 12, 2023 at 9:57 AM