Code Definition

B1229 — Fuel Temperature Sensor #2 Circuit Short to Ground

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

About B1229

B1229 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 B1229 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.

B1229 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 used by the control module to monitor fuel temperature at a second point in the fuel system, commonly the return line, the filter housing, a heated fuel filter, or the secondary rail on a dual bank platform. DTC B1229 sets when the control module detects that the sensor #2 signal voltage has collapsed to near 0V for a sustained period, which is consistent with the signal circuit being shorted to ground either inside the sensor, in the wiring harness, or inside the control module connector. A short to ground forces the signal to indicat...

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