Lost Communication with HVAC Rear Module B

What This Means

The vehicle's CAN bus network has lost communication with the HVAC Rear Module B. This means other modules cannot exchange data with this module, which may disable related systems.

Common Symptoms

• HVAC Rear Module B functions disabled
• Warning lights on
• Communication fault during diagnostics
• Related systems inoperative

Common Causes

• Failed HVAC Rear Module B
• CAN bus wiring damage
• Corroded network connector
• Power/ground issue to module
• Water intrusion

Estimated Repair Cost