B1265 Cold Air Bypass Door Actuator Circuit Failure

OBD2 Code: B1265

Description: Cold Air Bypass Door Actuator Circuit Failure

Definition: This code indicates a malfunction in the circuit controlling the cold air bypass door actuator. The actuator is responsible for regulating airflow within the HVAC system, and a failure in this circuit can lead to improper climate control operation.

Common Causes

b1265 – Cold Air Bypass Door Actuator Circuit Failure

Common Causes:

• Faulty cold air bypass door actuator
• Short circuit or open circuit in the wiring harness
• Loose or corroded electrical connections related to the cold air bypass door actuator circuit
• Defective control module that manages the cold air bypass door actuator

Common Misdiagnosis

OBD2 Code: B1265

Description: Cold Air Bypass Door Actuator Circuit Failure

Common Misdiagnosis: Replacing the actuator without checking for wiring issues or a faulty control module.

Common Diagnostic Steps

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OBD2 Code: B1265

Description: Cold Air Bypass Door Actuator Circuit Failure

• Check for any stored codes and freeze frame data using an OBD2 scanner.
• Inspect the cold air bypass door actuator for physical damage or obstruction.
• Test the actuator’s electrical connector for corrosion, loose connections, or damaged pins.
• Measure the voltage and ground signals at the actuator connector using a multimeter to ensure they are within specifications.
• If applicable, perform a continuity test on the wiring harness between the control module and the actuator to check for open or short circuits.
• Use a scan tool to command the actuator and observe its operation. Verify if it responds correctly to commands from the HVAC control module.
• If all tests pass but the issue persists, consider replacing the cold air bypass door actuator.