B1913: Airbag Circuit Short to Ground
Diagnostic trouble code B1913 indicates a short to ground in the driver or passenger airbag circuit. This code is set when the Restraints Control Module (RCM) detects abnormally low resistance or near-zero voltage on the airbag deployment circuit, meaning current is leaking to chassis ground. This fault compromises the passive safety system by preventing the RCM from correctly assessing the squib's electrical state, which could cause unintended deployment or failure to deploy during a crash.
1. Commonly Affected Makes
2. Most Common Causes
- Airbag circuit wiring shorted to ground (chassis)
- Damaged airbag harness connector with bent or corroded pins
- Internal short in the airbag module squib
- Water damage or corrosion in SRS system connectors
3. Symptoms You Will Notice
- Airbag warning light illuminated on the dashboard
- Supplemental Restraint System (SRS) fault message displayed
4. Step-by-Step Diagnosis
Scan the vehicle for all stored DTCs and note freeze frame data.
Visually inspect the airbag wiring and connectors for damage, corrosion, or pin issues.
Measure resistance between the airbag circuit wires and chassis ground; a reading near 0 ohms confirms a short to ground.
Disconnect the airbag module and check for internal short using a multimeter (follow manufacturer safety procedures).
If wiring and module check out, test the RCM per service manual or replace if necessary.
5. Frequently Asked Questions
Is it safe to drive?▼
No, driving with this code is not safe. The airbag may deploy unexpectedly or fail to deploy in a crash, increasing the risk of injury. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs typically range from $200 to $1,200 depending on the cause. Simple wiring repairs may cost $200–$400, while replacing an airbag module or RCM can run $800–$1,200 including labor.