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Possible Causes

Possible Causes
(C266) MODE DOOR DRIVER 1 CIRCUIT OPEN OR HIGH RESISTANCE
(C266) MODE DOOR DRIVER 1 CIRCUIT SHORTED TO ANOTHER CIRCUIT
(C66) MODE DOOR DRIVER 2 CIRCUIT OPEN OR HIGH RESISTANCE
(C66) MODE DOOR DRIVER 2 CIRCUIT SHORTED TO ANOTHER CIRCUIT
(C235) MODE DOOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
(C235) MODE DOOR SIGNAL CIRCUIT SHORTED TO ANOTHER CIRCUIT
(C34) SIGNAL RETURN CIRCUIT OPEN OR HIGH RESISTANCE
MODE DOOR ACTUATOR
HVAC MODULE

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

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