What B1603 means: CAN Bus Off (network communication) — not a direct airbag fault. It is a module communication code.
Does LockNCal handle this? No — module communication faults aren’t part of our mobile safety-systems service, so this one is best diagnosed by a qualified repair shop. If the same scan also shows airbag/SRS, ADAS, or key & immobilizer codes, those we do handle — call or text (469) 277-7277.
Because B1603 is a module communication fault, the symptoms and the correct repair depend on that system. Have the code confirmed with a diagnostic scan and repaired by a qualified technician before it causes further problems.
