B1910: RCM Ground Circuit Fault
Diagnostic trouble code B1910 indicates that the Restraints Control Module (RCM) has detected a fault in the internal diagnostic monitor ground circuit. This means the ground path for the RCM's microprocessor or its monitoring circuit has high resistance or is open, preventing proper verification of the airbag system and disabling the Supplemental Restraint System (SRS).
1. Commonly Affected Makes
2. Most Common Causes
- Open or high-resistance RCM ground circuit
- Loose, corroded, or damaged ground connection (e.g., G101, G102)
- Damaged RCM harness wiring or short to battery voltage
- Internal failure of the Restraints Control Module (RCM)
3. Symptoms You Will Notice
- Airbag warning light illuminated on the dashboard
- SRS system disabled, airbags may not deploy in a crash
4. Step-by-Step Diagnosis
Scan the RCM for fault codes and record freeze frame data.
Visually inspect ground connections (G101, G102, etc.) for corrosion, looseness, or damage.
Check RCM harness wiring for opens, shorts, or damage.
Measure resistance between RCM ground pins and chassis ground; should be near 0 ohms.
If wiring and grounds are okay, suspect internal RCM failure and replace module.
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe. The SRS system is disabled, meaning airbags may not deploy in a collision, increasing injury risk. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs typically range from $100 to $500 for wiring/ground repairs, or $400 to $1,200 if the RCM needs replacement, including parts and labor.