Aux Heater Coolant Pump Circuit Short to Ground
The auxiliary heater's coolant pump circuit is detecting a short to ground, meaning the electrical path is taking an unintended shortcut. It's like water escaping through a crack in a pipe instead of flowing through the pump.
The ECU monitors the auxiliary heater coolant pump circuit's resistance and voltage draw. Under normal operation, the pump draws a specific current range; a short to ground causes excessive current draw or zero resistance, triggering the fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Circuit Resistance | >50 ohms when pump disabled | <5 ohms (short to ground detected) |
| Current Draw | 3-8 amps during pump operation | >15 amps or continuous draw at rest |
Code B2468 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, B2468 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.