What it means
B0026 indicates the SRS/airbag control module has detected an open circuit or excessively high resistance in the driver’s frontal airbag Stage-1 deployment loop (the primary inflator stage in a dual-stage system). OEM service literature describes B0026 as an “open/high-resistance” condition in the steering-wheel airbag loop; several manuals include explicit resistance/voltage thresholds for when the DTC sets. For example, Saab WIS specifies B0026 when the measured loop resistance exceeds ~4.5 ± 0.2 Ω for ~2 s (and lists companion thresholds for B0022 low resistance and B0024 voltage out of range). Saab Wisonline
Typical symptoms
- AIRBAG/SRS warning lamp on; the SDM/RCM stores B0026 and may request the cluster indicator.
- Driver airbag may be inhibited until the fault is corrected and cleared.
- No engine drivability symptoms. Charm+1
Severity / priority
High (safety-critical). An open/high-resistance deployment loop can lead to non-deployment of the driver airbag in a crash. Repair and verification are urgent. Saab Wisonline
Common causes
- Clock spring (spiral cable) damage/wear in the steering column creating an intermittent open or added resistance.
- Connector/terminal issues at the steering-wheel module, column base, or intermediate harness (backed-out pins, corrosion, poor tension).
- Wiring damage (chafed, pinched, or broken conductors) in the wheel/column harness.
- Less common: driver airbag module internal fault or SRS control module (SDM/RCM) fault. Evidence from GM service procedures points first to wiring/clock-spring checks; GM also calls out connector C221/C222 in the IP harness on some platforms. Charm+2GM-Trucks.com+2
Diagnostic notes (process highlights)
- Use an SRS-capable scan tool to confirm B0026, capture freeze-frame, and check for companion loop codes (e.g., B0022 low resistance, B0024 voltage out of range). Follow OEM SRS safety procedures (battery disconnect and wait times; never probe live inflator circuits). Charm+1
- Perform a detailed visual/physical inspection of the clockspring, column harness, and connectors; flex the harness while monitoring data to expose intermittents. Charm
- With the airbag disconnected per OEM procedure, measure loop/segment resistance and check for open/high resistance; compare to OEM specs/thresholds (Saab example cited above). Saab Wisonline
- On several GM platforms, if B0026/B0044 are present, manuals explicitly direct testing for open/high resistance on the steering-wheel module high/low control circuits and inspecting the C221/C222 connectors. Charm+1
Possible fixes
- Repair/replace damaged wiring or terminals in the steering-wheel/column harness; correct pin fit, corrosion, or strain-relief issues. Charm
- Replace a failed clock spring, then perform any required initialization/calibration. Charm
- If the loop and clockspring test good, evaluate/replace the driver airbag module; consider SDM/RCM only after the loop hardware is verified good. Charm
- Clear DTCs, cycle the ignition, and verify with a re-scan and functional check. Charm
Sources
- Saab WIS (factory manual) — explicit fault criteria for B0022/B0024/B0026 (resistance/voltage thresholds and timing). Saab Wisonline
- GM service manual excerpt (Charm.li) — diagnostic direction for B0026/B0044: test for open/high resistance in steering-wheel module high/low circuits. Charm
- GM-Trucks forum thread quoting GM procedure — calls out inspection of C221/C222 connectors for B0026. (Use as corroborative practitioner source; defer to OEM manual for procedures.) GM-Trucks.com
- Additional corroboration (platform-specific listings): Saab WIS pages enumerating B0026 as “Driver Front Airbag Loop 1 Circuit, Open.” Saab Wisonline+1