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Home >> Chrysler >> 2021 >> Voyager LX, Gas >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating & Air Conditioning - DTCS B11F0-15 To U1519-00 >> DTC Troubleshooting >> B21DD-84-System Voltage - Signal Below Allowable Range >> Possible Causes

Possible Causes

Possible Causes
RELATED CHARGING SYSTEM DTCS PRESENT
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT OPEN
HVACR MODULE

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

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