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 MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 5 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC TESTSDTC B1071: INTERNAL SDM FAILURECONDITIONS FOR SETTING DTC
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8
Conditions For Setting DTC
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Conditions For Setting DTC
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2000 GMC Savana Special, 2000 GMC Savana Camper Special, 2000 GMC Savana, 2000 Chevrolet RV Cutaway, and 2000 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
DTC sets when any of the following conditions are detected by SDM:
- 23 VLR voltage is out of normal operating range during POWER-ON or CONTINUOUS MONITORING tests.
- Crash data recording reserve voltage discharge time failure for 3 consecutive ignition cycles during POWER-ON test.
- Calculated checksum for internal memory does not match stored value during POWER-ON test.
- Driver or passenger deployment loop is shorted to ground during CONTINUOUS MONITORING tests.
- Accelerometer is malfunctioning during POWER-ON or CONTINUOUS MONITORING tests.
- Driver or passenger current source is malfunctioning during RESISTANCE MEASUREMENT test.
- Temporary memory storage area is malfunctioning during POWER-ON test.
- SDM is unable to read from or write to EEPROM during POWER-ON test.
- Arming sensor inside SDM is not closed during deployment event.
- Voltage measured at DRIVER LOW and PASSENGER LOW is too low during POWER-ON or CONTINUOUS MONITORING tests.
- Device in SDM that arms system for deployment is malfunctioning during POWER-ON or CONTINUOUS MONITORING tests.
- Permanent memory storage area is malfunctioning during POWER-ON test.
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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.