Professional Scan: Use a high-level diagnostic tool (like the Isuzu G-IDSS) to see if the code is "Active" or "Stored."

Diagnostic trouble code (DTC) on Isuzu vehicles, such as the D-MAX or MU-X, typically indicates a general Electronic Control Unit (ECU) Malfunction . While the core code B101D refers to an internal hardware performance failure within a control module, the specific "30" suffix is a symptom byte often interpreted by diagnostic tools as a generic internal fault. Meaning and Impact

Essentially, the airbag computer has detected an internal hardware glitch or a software corruption that it cannot self-correct. When this happens, the SRS warning light on your dashboard will stay illuminated, and the airbag system may be disabled as a safety precaution. Common Causes for the B101D:30 Code