Code Definition

B1226 — Fuel Temperature Sensor #2 Circuit Failure

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

About B1226

B1226 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 B1226 is stored, the module has detected 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.

B1226 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 a secondary NTC thermistor fitted on vehicles that monitor fuel temperature at more than one point, typically used to track return fuel temperature at the tank side of the return line, inside the fuel filter housing, or at the second rail of a dual bank fuel system. DTC B1226 sets when the control module sees the sensor #2 signal voltage or calculated resistance outside the expected range in a way consistent with a circuit failure rather than a real thermal event. The control module uses the second fuel temperature input to cross check the primary sensor, protect ...

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