Code Definition

B1012 — Ambient temperature sensor signal Circuit open

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

About B1012

B1012 is a manufacturer-specific body diagnostic trouble code recorded for Mitsubishi vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1012 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.

B1012 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 ambient temperature sensor on Mitsubishi vehicles is a Negative Temperature Coefficient (NTC) thermistor typically mounted behind the front bumper or in the lower grille area, where it measures outside air temperature for the automatic climate control system. DTC B1012 is set when the HVAC control module detects an open circuit condition in the ambient temperature sensor signal circuit, meaning the electrical path between the sensor and the module is broken and no valid signal is being received. An open circuit presents as infinite resistance to the control module, which reads the resultin...

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