Tire pressure monitoring sensor warning light is on and dome light flashing?

GREENWELL

MEMBER
2010 FORD F-150
5.4L
V8
4WD
AUTOMATIC
97,000 MILES

Walmart put 4 new TPMS sensors in my truck listed above, along with the new tires. Now the dome lights flash we engine is running. The tire pressure monitoring sensor warning light is on the dash. I have successfully reset/relearned the sensors via hazard lights method (horn honks to move to next tire and at the end it says Training Complete with no additional horn sounds). Filled tires back up with air and have driven truck. Yet the dome lights flash, and warning light is on dash. Your help is appreciated.

Tuesday, January 14th, 2025 AT 1:34 PM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
50,788 POSTS

Your truck requires 315 MHz TPMS sensors (or 433 MHz in some models). If Walmart installed aftermarket or incorrect frequency sensors, they may not be properly recognized by the system. I would try a hard system reboot to see if that doesn't fix it, this guide can help:

https://www.2carpros.com/articles/step-by-step-guide-performing-a-hard-system-reboot-for-your-vehicles-electronics-systems

If this doesn't work, we need to do a CAN scan to see which codes are stored, which will point us in the right direction.

You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

I see that the smart junction box, (GEM) runs both these systems which if Walmart let the battery get low and then boosted it could have blown it out. I would feel better about getting a code though before we jump to that conclusion. Here is how to change out the SJB in case you need it. Check out the images (below). Let us know what you find.

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