Code Definition

B1008 (11) — Combination switch Circuit shorted to Earth

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

About B1008

B1008 is a manufacturer-specific body diagnostic trouble code recorded for Mazda vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1008 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.

B1008 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) in Mazda vehicles monitors the electrical circuits connected to the steering column combination switch assembly, which integrates the turn signal, headlight, high beam, passing flash, and windshield wiper controls into a single multifunction stalk unit. DTC B1008-11 is set when the BCM detects an abnormally low resistance or direct short-to-ground condition on the combination switch circuit, indicating that current is flowing to earth through an unintended path rather than through the switch contacts as designed. This type of fault typically results from insulatio...

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