B2798 OBD Code Definition:
B2798 Communication Malfunction No. 2 Immobilizer System
B2798 OBD Code Description:

Possible causes
– faulty key
When is the obd code mean?
Communication error
B2798 OBD Code Description

This code is stored in the memory when a key that does not have a transponder chip is inserted or if communication between the key and transponder key ECU assy is impossible.

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