Code Definition

B1225 — Fuel Temperature Sensor #1 Circuit Short to Ground

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

About B1225

B1225 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 B1225 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.

B1225 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 used by the control module to monitor fuel temperature for injector pulse width correction, fuel density compensation, and fuel system heat monitoring, and is typically mounted on the fuel rail, return line, or inside the fuel pump module. DTC B1225 sets when the control module detects that the sensor signal voltage has collapsed to near 0V for a sustained period, which is consistent with the signal circuit being shorted to ground either inside the sensor, in the wiring harness, or inside the control module connector. A short to ground forces the...

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