What it means
B0030 sets when the SRS/airbag module detects the deployment-loop voltage for the passenger (right-front) Stage-1 circuit is outside the allowable window—typically indicating a short-to-ground or short-to-battery condition, or other electrical anomaly. Factory criteria examples (Saab WIS): loop pin voltage >≈4.1 V or <≈1.0 V for ~2 s triggers B0030; the same section lists B0028/B0029 as the low/high resistance companions. Definitions vary slightly by make, but the fault class is consistent. Saab Wisonline
Typical symptoms
- AIRBAG/SRS lamp on; DTC stored; system inhibits that deployment loop.
- No drivability impact. Charm
Severity / priority
High (safety-critical). Out-of-range loop voltage can cause non-deployment or improper deployment during a crash. Address immediately. Saab Wisonline
Common causes
- Short-to-ground or short-to-battery on the passenger airbag high/low control circuits.
- Wiring damage or pinched harness segments in the IP/column/seat areas.
- Connector/terminal faults (poor pin fit, corrosion, contaminated shorting bars).
- Less common: airbag module internal fault or SDM/RCM fault. Charm+1
Diagnostic notes
- Use an SRS-capable scan tool; verify B0030 and look for related loop codes (B0028/B0029). Follow OEM SRS safety procedures throughout. Charm
- Perform circuit-level tests per the service manual: check for short-to-GND/B+ on the loop’s high/low control circuits; inspect IP harness routing and intermediate connectors. Charm
- If available, monitor live loop parameters or perform guided diagnostics in OEM service software to localize the fault.
- Reference OEM thresholds (e.g., Saab WIS voltage window above) when interpreting measurements. Saab Wisonline
Possible fixes
- Repair the harness where a short is found; restore insulation and proper routing/strain relief. Charm
- Correct connector/terminal issues or replace housings/pigtails if shorting bars or pins are damaged.
- Replace the airbag module only if it fails OEM-directed checks; evaluate SDM/RCM last.
- Clear codes and re-verify with a functional check. Charm
Sources
- Saab WIS (factory service) with explicit fault criteria for B0028/B0029/B0030 (resistance/voltage thresholds, timing). Saab Wisonline
- GM service-manual excerpt (Charm.li) referencing the right-front/passenger deployment-loop diagnostics for adjacent codes and the open/high-resistance/short checks used with B0030. Charm
- Additional practitioner corroboration that B0030 relates to the RF/passenger deployment loop and short conditions. JustAnswer