Code Definition

B2778 — A-B or A-C Pillar Curtain Circuit Open, Passenger Side

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Ford

About B2778

B2778 is a generic (obd-ii standard) body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2778 is stored, the module has detected an open (broken or disconnected) electrical path 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.

Because B2778 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Restraints Control Module (RCM) continuously monitors the passenger side curtain airbag deployment circuit, including the inflator squib and the associated wiring routed up the A pillar and along the roof rail between the A, B, and C pillars. The RCM applies a small test current and measures the loop resistance to confirm continuity and deployment readiness. DTC B2778 is set when the RCM detects that the passenger side curtain airbag loop resistance is higher than the calibrated upper threshold, indicating an open circuit somewhere between the module and the inflator. When this code is set...

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