B1A35 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1A35 – Unidentified Key Communication Error


B1A35 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B1A35 Possible Causes


Faulty Fob-Integrated-Key (FOBIK),Faulty Wireless Ignition Node (WIN)


B1A35 Description


Whenever a Fob-Integrated-Key (FOBIK) is inserted in the Wireless Ignition Node (WIN) basestation, the WIN performs a self test and resynchronization routine. During the routine, the WIN interrogates the FOBIK, performing various validity and performance tests. The repair of this fault condition relies on whether the FOBIK ID is received by the WIN. During interrogation, the FOBIK sends an LF (Low frequency) signal to the WIN that includes the programmed FOBIK ID. This Diagnostic Trouble Code (DTC) sets if a FOBIK is inserted in the WIN basestation but the WIN does not receive or is unable to read an ID from the FOBIK. This DTC will remain active until a valid programmed FOBIK is inserted in the WIN and its ID is received.