Blower Control Circuit Failure
The blower motor circuit that controls your cabin fan isn't working properly—think of it like a light switch that's broken and won't send power to the fan. The body control module detected an electrical fault in the blower control system.
The body control module monitors the blower control circuit for proper voltage supply and ground continuity. It expects to see the correct voltage levels when commanding the blower motor at different speeds and detects faults when resistance is too high, wiring is open, or the motor circuit is shorted.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Blower Circuit Voltage | 12V with good continuity at all speeds | Out-of-range voltage or open/short circuit detected |
| Circuit Resistance | <5 ohms (good ground/connections) | >20 ohms or infinite resistance |
Code B2516 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, B2516 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.