Code Definition

B1224 — Fuel Temperature Sensor #1 Circuit Short to Battery

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

About B1224

B1224 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 B1224 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

B1224 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 #1 is an NTC thermistor that feeds fuel temperature to the control module, generally mounted on the fuel rail, return line, or integrated into the fuel pump module assembly. DTC B1224 sets specifically when the control module detects a short to battery voltage on the sensor signal circuit, meaning the signal pin is sitting above its normal 5V reference rail and is being pulled up by an unintended 12V source somewhere in the harness. The control module uses fuel temperature data for injector pulse width correction, fuel density compensation, and monitoring fuel heating u...

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