Code Definition

B120A (86) — Collision Risk Alert Fault – Signal Invalid

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

About B120A

B120A 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.

B120A 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 Advanced Driver Assistance System (ADAS) module in Peugeot vehicles coordinates the Collision Risk Alert function, using input from a forward facing radar sensor (usually mounted behind the front grille or emblem) and in some configurations a multifunction camera behind the windscreen, to detect the presence, distance, and closing speed of vehicles and obstacles in the vehicle's path. The module processes these inputs on the CAN bus, computes a collision risk value, and triggers visual and audible warnings to the driver if a collision appears imminent. DTC B120A with sub code 86 is stored ...

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