When a customer comments on a condition related to tire pressure monitoring, it is very important to distinguish between Check Tire Pressure / Low Tire Pressure conditions and Service Tire Monitor system issues. Understanding the difference between the two distinct conditions will help you distinguish between normal system operation (tire needs air) and a system malfunction.
There are two important differences between a Check Tire Pressure / Low Tire Pressure message/light and a Service Tire Monitor message light:
• A Check Tire Pressure / Low Tire Pressure message/light will stay on solid and no system codes are set. The TPM system is operating as designed. Correcting the tire pressure will resolve the issue.
• A Service Tire Monitor message/light will blink and system codes WILL set. There is a condition that should be diagnosed and corrected.
Service Tire Monitor System (light blinks, then stays on)
The Tire Pressure Light will blink for about one minute and a Service Tire Monitor message will be displayed when a system malfunction occurs. For example: If one or more tire pressure sensors does not transmit information for 18 minutes of driving, the TPM system WILL set a code, display a message, and BLINK the light for about a minute, after which the light will stay on solid for the remainder of the ignition cycle. If the system fault is intermittent, the message/light may also be intermittent – on during some ignition cycles, off during others.
Try recalibrating the TPM system and see if it corrects your problem. If not, then you have a bad sensor(s) and the relearn will let you know which one(s)...