Aux Heater Flame Out Fault
The auxiliary heater's flame went out unexpectedly, like a pilot light on a gas stove that won't stay lit. The ECU detected the ignition failed and shut down the heating system for safety.
The ECU monitors the flame rod sensor signal and fuel injector voltage during aux heater startup. If the flame rod detects no ignition within the expected time window, or the signal drops unexpectedly during operation, a flame-out is logged.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Flame Rod Signal | 0.5–5V during combustion | No signal or <0.2V after ignition attempt |
| Startup Sequence Duration | 2–4 seconds to flame detection | No flame detection after 5+ seconds |
Code B2462 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, B2462 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.