Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 55 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)TESTING - DIAGNOSTICDTC B1071: INTERNAL SDM FAILURENOTES
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
DTC B1071: Internal SDM Failure: Notes
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Notes
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1998 GMC Savana Special, 1998 GMC Savana Camper Special, 1998 GMC Savana, 1998 Chevrolet RV Cutaway, and 1998 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
When DTC B1018 or B1024 has been set, DTC B1071 sets, and SDM must be replaced. When scan tool CLEAR CODES is received and malfunction no longer exists, DTCs B1018 or B1024 and B1071 will remain current. Ensure short to ground condition is repaired prior to installing replacement SDM to avoid damage to component.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.