Fuel Temperature Sensor #2 Circuit Open
The engine computer can't read the fuel temperature sensor #2 because the electrical wire connecting it is broken or disconnected. It's like a phone with a severed cord—the device works fine, but there's no way to receive the message.
The ECU monitors the voltage signal from fuel temperature sensor #2 to adjust fuel injection timing and enrichment. When the circuit is open, the sensor produces no voltage signal, causing the ECU to detect an absence of communication from the sensor.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Voltage | 0.5-4.5 volts (varies with fuel temp) | No signal or constant high/low voltage |
| Resistance | 1000-10000 ohms (temperature dependent) | Open circuit (infinite resistance) |
Code B1227 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, B1227 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.