B1681 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1681 – PATS Transceiver Module Signal Is Not Received


B1681 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B1681 Possible Causes


Faulty Passive Anti-Theft System (PATS) transceiver,Faulty Powertrain Control Module (PCM),Faulty Passive Anti-Theft System (PATS) key


B1681 Description


During each vehicle start sequence, the transceiver module reads the Passive Anti-Theft System (PATS) key identification code and sends the data to the Powertrain Control Module (PCM).