B1A7B Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1A7B – Immobilizer Antenna

 

B1A7B Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1A7B Possible Causes

 

Faulty Immobilizer Antenna,Immobilizer Antenna harness is open or shorted,Immobilizer Antenna circuit poor electrical connection,Faulty Keyless Ignition Nod (KIN),Faulty Ignition Node Module (IGNM),Faulty Radio Frequency Hub (RFH) Module

 

B1A7B Description

 

The Keyless Ignition Nod (KIN) / Ignition Node Module (IGNM) antenna supply voltage is sampled and found to be out of range of the expected value (below 8.0 or above 16.0 volts) or when the hard-wired ignition run/start line between the KIN / IGNM and Radio Frequency Hub (RF Hub) (RFH) indicates a different ignition position from the received signal of the LIN bus between the KIN / IGNM and the RFH.