Code Definition

B1222 — Fuel Temperature Sensor #1 Circuit Failure

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

About B1222

B1222 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 B1222 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.

B1222 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 a negative temperature coefficient (NTC) thermistor that reports fuel temperature to the control module, typically mounted in the fuel rail, return line, or inside the fuel tank on the pump module. DTC B1222 sets when the control module sees the sensor signal voltage or calculated resistance sitting outside the expected operating range, which the module treats as a circuit failure rather than a simple sensor drift. Fuel temperature data is used by the control module to trim injector pulse width for fuel density compensation, monitor fuel system heating under high ...

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