Servo Motor Defrost Circuit Failure
The defrost servo motor that controls air direction isn't responding properly to commands from the climate control system. It's like a broken lever that can't move the air vents between windshield and regular cabin positions.
The ECU monitors the servo motor circuit voltage, current draw, and position feedback during defrost mode activation. It expects specific resistance and voltage patterns when commanding the motor to move between defrost and normal air positions. If actual values fall outside normal operating ranges, the fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Motor Circuit Voltage | 11-14V during operation | Below 9V or above 15V, or no voltage |
| Position Feedback Signal | 0.5-4.5V proportional to motor position | Stuck value or no signal variation |
Code B1262 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B1262 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.