Code Definition

B1204 — Fuel Sender Circuit Short To Ground

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

About B1204

B1204 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 B1204 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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.

B1204 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 sender is a float and resistor assembly (or a Hall effect position sensor on some platforms) inside the fuel tank that returns a variable voltage or resistance signal to the instrument cluster or Body Control Module for the fuel gauge and low fuel warning. DTC B1204 Fuel Sender Circuit Short To Ground is set when the monitoring module detects the sender signal wire pulled low (typically below a calibrated threshold near 0.2V or less than a few ohms to ground) for longer than a fault filter time, which is below the normal operating window for a functioning sender. The short can occur i...

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