Aux Heater Start Counter Overrun/System Locked (same as below ?)
Your auxiliary heater has tried to start too many times in a row without successfully running, so the system has locked itself out for safety. Think of it like a car alarm that disables after repeated failed activation attempts.
The ECU monitors how many consecutive times the auxiliary heater attempts to ignite. If the starter motor cycles repeatedly without successful combustion, a counter increments. When the counter exceeds the threshold, the system enters a lockout state to prevent fuel flooding or component damage.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Start Attempt Counter | 0-3 consecutive failed attempts | 4+ consecutive failed attempts triggers lockout |
| System State | Active/Ready to heat | Locked (heater disabled until power reset) |
Code B2465 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, B2465 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.