DTC C2521 Speed Abnormal

DTC DETECTING CONDITION: 

Vehicle speed function codes were received from the transmitter, but the vehicle speed signal was not input to the module.

Trouble symptom: 

Tire pressure warning light blinks 25 times and then illuminates.

Wiring diagram: 

Tire Pressure Monitoring System Ref. to WIRING SYSTEM>Tire Pressure Monitoring System>WIRING DIAGRAM .

Fig 1: Tire Pressure Monitoring System Wiring Diagram (Speed Abnormal)

Courtesy of SUBARU OF AMERICA, INC.

Fig 2: Tire Pressure Monitoring System Diagnosis Flowchart (Speed Abnormal)

Courtesy of SUBARU OF AMERICA, INC.