Code Definition

B1220 — Fuel Tank Pressure Sensor Circuit Open

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

About B1220

B1220 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 B1220 is stored, the module has detected an open (broken or disconnected) electrical path 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.

B1220 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

The Fuel Tank Pressure (FTP) sensor monitors pressure and vacuum inside the fuel tank as part of the Evaporative Emission (EVAP) control system, reporting to the control module through a three wire circuit consisting of a 5V reference, signal, and ground. DTC B1220 sets when the control module detects that the FTP sensor signal voltage is outside the expected operating window, typically pinned at reference voltage or ground, which indicates an electrical open somewhere between the sensor and the control module. The sensor itself is a small capacitive or piezoresistive transducer usually mounte...

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