Aux Heater Coolant Pump Circuit Open
The auxiliary heater's coolant pump circuit isn't working properly—like a broken water pump that can't circulate fluid through your heating system. The ECU detected an open circuit (broken connection) preventing the pump from operating.
The ECU monitors the current draw and voltage across the auxiliary heater pump circuit. It expects to see normal resistance and current flow when the pump is commanded on. An open circuit creates infinite resistance, causing voltage and current readings to fall outside expected parameters.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Pump Circuit Current | 3-8 amps when activated | 0 amps or below minimum threshold |
| Pump Circuit Voltage | 11-14 volts at pump | Open circuit (no continuity detected) |
Code B2469 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, B2469 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.