Code Definition

B1265 — Servo Motor Coolair Bypass Circuit Failure

System: Body  |  Type: Manufacturer-Specific  |  Make: Generic

About B1265

B1265 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1265 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1265 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The climate control module monitors the cool air bypass servo motor through bidirectional drive lines and a position feedback signal from an internal potentiometer. DTC B1265 is set when the module commands the servo to move the cool air bypass door but does not see the expected feedback voltage change, sees an out of range value on the feedback wire, or detects an electrical short or open on the motor command circuit. The cool air bypass servo regulates how much fresh, uncooled air bypasses the cooling components inside the HVAC case, allowing fine temperature blending. When this code is set,...

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