Code Definition

B1018 — Temperature adjusting switch malfunction

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

About B1018

B1018 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.

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.

B1018 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

On Mitsubishi vehicles equipped with automatic climate control, the A/C or HVAC control module uses a potentiometer or resistor network inside the temperature adjusting switch (the driver's or passenger's temperature selector) to determine the requested cabin temperature. The module supplies a reference voltage to the switch and reads back a varying voltage as the knob or slider is moved. B1018 sets when the returned signal stays fixed at one extreme, falls outside the expected voltage window, or fails to change in response to user input during a self test. With this code active, the HVAC syst...

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