Code Definition

B1203 — Fuel Sender Circuit Short To Battery

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

About B1203

B1203 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 B1203 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.

B1203 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) located 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 B1203 Fuel Sender Circuit Short To Battery is set when the monitoring module detects the sender signal wire pulled to battery voltage for longer than a calibrated time, which is above the normal operating window for a functioning sender. A short to battery typically occurs where the sender signal wire has abraded against...

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