Code Definition

B1228 — Fuel Temperature Sensor #2 Circuit Short to Battery

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

About B1228

B1228 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 B1228 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.

B1228 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, generally fitted to the return line, the fuel filter housing, a heated filter assembly, or the secondary rail of a dual bank fuel system. DTC B1228 sets specifically when the control module detects a short to battery voltage on the sensor #2 signal circuit, meaning the signal pin is sitting above its normal 5V reference rail and is being pulled up by an unintended 12V source in the harness or the sensor. Because the control module biases the NTC sensor through an internal pull up resi...

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