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Home >> Infiniti >> 2014 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 124 (Audio, Visual & Navigation System (DTC/Circuit Diagnosis) (BOSE Audio W/NAVI W/O Surround) (Except Hybrid) (1 Of 2)) >> DTC/Circuit Diagnosis >> DTC U121B: Av Control Unit >> DTC Logic

DTC Logic

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
CONSULT Display DTC Detection Condition Possible Cause
HDD COMM
[U121B]		 AV control unit malfunction is detected. An intermittent error causing HDD malfunction may be detected.
Replace AV control unit if malfunction occurs constantly.
Refer to REMOVAL AND INSTALLATION .
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