Code Definition

B1D23 (68) — Overheat Sensor Circuit – Signal Invalid

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

About B1D23

B1D23 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1D23 is stored, the module has detected 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.

B1D23 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 Body Control Module (BCM) monitors an overheat sensor circuit on this vehicle to detect abnormally high temperatures in a protected subsystem and warn the driver or trigger protective action. DTC B1D23:68 with the :68 signal invalid failure type byte is set when the BCM evaluates the overheat sensor signal and finds it implausible compared with expected electrical values, related temperature sensors, or vehicle operating conditions. The signal may be stuck at a fixed value, varying erratically, or out of step with companion temperature inputs. When this code is active the BCM may inhibit t...

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