C2321 Code: Meaning, Causes, and Symptoms | OBD2 Codes
C2321 – Transmitter 1 Function Code Abnormal
C2321 Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Tire Pressure Monitor System (TPMS) Warning Light ON
C2321 Possible Causes
Tire pressure not to factory specifications,Faulty Tire Pressure Transmitter,Faulty Tire Pressure Monitor System (TPMS) Control Module
The Tire Pressure Monitor (TPM) system checks the tire pressures of all 4 road wheels when the vehicle is driven at speeds above 25 mph (40 km/h), and warns in the event of a loss of pressure by means of a low tire pressure warning light. A sensor installed in each wheel will indicate when tire pressure is severely low. The TPM system will activate only when the vehicle is driven. The Tire Pressure Monitor System (TPMS) Control Module monitors the tire pressure at each wheel. The TPMS Control Module sets the OBDII code when the tire pressure signal is not to factory specifications.