This code indicates the airbag control module has detected an electrical fault in the deployment circuit for the right-side curtain airbag. The module monitors resistance in the squib circuit and sets this code when it finds an open, short to ground, short to voltage, or high resistance that could prevent the airbag from firing during a side-impact or rollover collision.
The squib inside the curtain airbag module can develop an internal open circuit or high resistance due to aging, vibration, or manufacturing defects, causing the control module to detect an out-of-specification resistance.
The low-voltage deployment circuit wires running between the airbag control module and the right curtain airbag can break, chafe, or melt due to collision damage or rodent activity, creating an open or short.
Moisture intrusion, oxidation, or physical damage at the inline connector near the airbag pillar trim or at the control module can increase resistance or create an open circuit in the deployment loop.
Installation of non-factory electrical accessories, remote starters, or alarm systems that tap into the airbag circuit can alter resistance values and trigger deployment control faults.
While rare, an internal fault within the ACM may cause it to incorrectly report a deployment circuit fault even when the wiring and airbag inflator are within specification.
The definition is universal; the diagnostics are engine-specific. Open your vehicle for the codes documented for it:
The vehicle will operate normally, but the right curtain airbag will likely not deploy in a collision, reducing side-impact protection for occupants. The seatbelt system remains functional, but the airbag warning indicates a compromised supplemental restraint system.
No. This code relates to the airbag system, not the powertrain. Replacing the Powertrain Control Module (PCM) will not fix B0029. The fault lies in the curtain airbag circuit, wiring, or possibly the Airbag Control Module.
You can clear the code, but the warning light will return immediately if the circuit fault persists. The code will only stay cleared after the underlying electrical problem—such as a broken wire or faulty airbag—is repaired.
The curtain airbag assembly itself contains the deployment squib that this code monitors; there is no separate sensor to replace. If diagnostics confirm the airbag is the cause, the entire curtain airbag module must be replaced.