B0040 GMC - Driver Side Deployment Loop Resistance Low
Repair Importance Level:
Repair Difficulty Level:
B0040 GMC Possible Causes
- Faulty Driver's Side Air Bag Module
- Driver's Side Air Bag Module harness is open or shorted
- Driver's Side Air Bag Module circuit poor electrical connection
First diagnose B0040 GMC code
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Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.
Cost of diagnosing the B0040 GMC code
Labor: 1.0
The cost of diagnosing the B0040 GMC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.B0040 GMC Possible Symptoms
- Air Bag Warning Light ON
B0040 GMC Meaning
When ignition switch is turned to RUN position, Sensing and Diagnostic Module (SDM) performs tests to diagnose critical internal malfunctions. SDM then performs deployment loop voltage out of range test and deployment loop resistance measurement test. If voltage out of range test detects a short to voltage condition, resistance measurement test will not be performed.
B0040 GMC More Information
Need more information on how to fix the B0040 GMC code?Get Access to Factory Service Manuals
Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service
- Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
- Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
- Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
- Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.