2008 Jeep Grand Cherokee Owner's Manual - Page 334

334 STARTING AND OPERATING NOTE: Your system can be set to display pressure units in PSI, kPa, or BAR. text message will not be present, and a pressure value will be displayed instead of dashes. A system fault can occur by any of the following scenarios: 1. Jamming due to electronic devices or driving next to facilities emitting the same Radio Frequencies as the TPM sensors. 2. Installing some form of aftermarket window tinting that affects radio wave signals. 3. Lots of snow or ice around the wheels or wheel housings. 4. Using tire chains on the vehicle. If the ignition key is cycled, this sequence will repeat, providing the system fault still exists. If the system fault no longer exists, the Tire Pressure Monitoring Telltale Light will no longer flash, the CHECK TPM SYSTEM 5. Using wheels/tires not equipped with TPM sensors. NOTE: If your vehicle is equipped with a matching full size spare wheel and tire assembly, it has a tire pressure monitoring sensor, and can be monitored by the Tire Pressure Monitoring System (TPMS). In the event that the