Check Low Tire / Aftermarket Wheels / Tire Pressure Monitor / FMVSS 138 - keywords C0750 C0755 C0760 C0765 DIC DTC TPM sensor operation light

This PI was superseded to update model years. Please discard PIT4316.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Some customer's may bring in their vehicle with a "Check Low Tire "message on the Drivers Information Center

The Tire Pressure Monitor (TPM) system consists of:

Each sensor sends a unique RF signal to the RCDLR to indicate the tire pressure. The RCDLR receives each signal and converts it to pressure data. This data is sent to the Driver Information Center on the GM low speed lan network. If any tire is more that 25% below the vehicles recommended tire pressure, the driver will receive notification to "Check Low Tire" either on the Instrument Panel Cluster or the Driver Information Center. This message will stay active until the low tire concern is corrected. This message cannot be disabled due to FMVSS 138. Aftermarket wheels installed without the sensors will activate the "Service Tire Monitor" warning and will stay on until the sensors are installed. Even if the sensors are installed in aftermarket wheels they may not mount in the correct OEM orientation and could still cause the "Service Tire Monitor" message to activate.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.