Code Definition

B1227 — Fuel Temperature Sensor #2 Circuit Open

System: Body  |  Type: Manufacturer-Specific  |  Make: Generic

About B1227

B1227 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1227 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1227 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

Fuel Temperature Sensor #2 is the secondary NTC thermistor in a multi point fuel temperature monitoring setup, commonly fitted to the return line, the fuel filter housing, a heated filter assembly, or the secondary rail of a dual bank fuel system. DTC B1227 sets specifically when the control module detects an open circuit on the sensor #2 signal, meaning the signal voltage has sat at or very near the 5V reference rail for a sustained period with no loading from a live NTC element. Because the control module biases the sensor through an internal pull up resistor to 5V, the loss of a sensor or a...

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