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Home >> Chrysler >> 2021 >> Voyager LXi, Gas >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> (Rear Heating & Air Conditioning - Electrical Diagnostics) >> DTC Troubleshooting >> B21DD-85-System Voltage - Signal Above Allowable Range >> Possible Causes

Possible Causes

Possible Causes
RELATED BODY CONTROL MODULE (BCM) DTCS PRESENT
RELATED CHARGING SYSTEM DTCS PRESENT
HVAC MODULE

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  HVAC PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE   . 

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