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Quick Tip: Chrysler® Wheel & Tire Calibration
Applies To: APOLLO-D8™, APOLLO-D9™, ETHOS® PRO, ETHOS® Tech, MODIS Edge™, MODIS Ultra™, SOLUS Edge™, SOLUS Legend™, SOLUS Ultra®, TRITON-D8®, VERUS® Edge, VERUS® PRO, ZEUS®
Vehicle: 2015 Jeep Grand Cherokee. When you change wheels and tires to a different size, how does that affect the Tire Pressure Monitoring system? There may be a programming function available to help. In this Diagnostic Quick Tip, National Field Trainer Jason Gabrenas shows you how to program new tire pressure thresholds on a Jeep using a scan tool.
When you change wheels and tires on vehicles, maybe you go to a larger wheel size or larger tire diameter, it can change a lot of things on the vehicle.
The speedometer might be off now and maybe the tire pressure monitoring thresholds could be a little different on different tires, so there's a couple of settings you can actually change with the scan tool inside a lot of newer Chrysler vehicles.
Let's walk through it on this Jeep right now. The tool is hooked up to the vehicle, so let's just turn it on. Ignition's on as well. The tool is going to id the vehicle for us. That little beep tells us that it's done.
Click on Scanner and there's our vehicle. This is going to be inside the Body Control Module and that is actually under Miscellaneous Functions as the first things where we can program tire size.
It says it's used to update the circumference value stored in the BCM after changing the size of the tires on the vehicle. So it's going to go see what it has already equipped. It's got two 65/50 R20s so maybe I want to change them down to 18 inch wheels.
So click on this, the Michelin all-seasons here. Programming the tire size was successful. It also says you need to run some initialization tests if the vehicle is equipped, but this one is not equipped with that particular system. So we can just go through there and exit.
Now I've got to go back one menu and go into System Tests and now I need to update my pressure thresholds because maybe the tire pressure monitoring system might have a different set level. And if I change the pressure in the tires, well maybe I might set a code.
So we can go through here and we can just hit continue. The first thing it's going to tell us is what's already programmed in the vehicle. Now we have it set the 36 pounds. So that means the tire pressure light will come on when the vehicle tire pressure gets below 36 pounds.
So let's go through here and maybe the tire wants to see a higher pressure. Maybe we want to set it to 40 pounds minimum, so we'll set it up there for the front. Same thing with the rear set at the 40 psi there. It's going to write the values in the computer.
It says we're successful. Hit continue. It's going to show you what the current values are. And there they are, set to 40 pounds.
So a couple of little steps didn't take too long, and now we can roll with the new tires and have everything working correctly.
Last Updated: August 14, 2020