Code Definition

B12AA (00) — Brake Pedal

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

About B12AA

B12AA is a manufacturer-specific body diagnostic trouble code recorded for Peugeot 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.

B12AA 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 Built in Systems Interface (BSI) on Peugeot vehicles monitors the brake pedal switch signal to confirm driver brake input for functions including brake lamps, cruise control disengagement, electronic parking brake release, start/stop inhibit, and ESP/ABS coordination. On most Peugeot platforms the brake switch is a dual contact assembly with a normally open (brake lamp) contact and a normally closed (redundant) contact, allowing the BSI to cross check that pedal state is consistent between the two signals. DTC B12AA:00 is logged when the BSI detects an electrical fault on the brake pedal s...

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