Passenger Airbag Loop #2 Short to Ground
The B2229 code indicates that the Restraint Control Module (RCM) has detected a short to ground in the passenger airbag module's Loop #2 circuit. Dual-stage airbags use two independent ignition loops; this fault disables the second deployment stage, compromising adaptive occupant protection in higher-severity collisions.
1. Commonly Affected Makes
2. Most Common Causes
- Short to ground in the Loop #2 high or low circuit wiring of the passenger airbag
- Faulty passenger airbag module (inflator) with low internal resistance to ground
- Damaged, corroded, or pushed-back terminals in connector C300 (under the seat) or the airbag module connector
- Internal failure of the Sensing and Diagnostic Module (SDM/DERM)
3. Symptoms You Will Notice
- Airbag warning light illuminated on the dashboard
- Reduced or disabled passenger airbag deployment capability
4. Step-by-Step Diagnosis
Scan the RCM for B2229 and any related codes
Visually inspect connector C300 under the passenger seat for corrosion, damage, or pushed pins
Measure resistance between the Loop #2 high and low circuits and ground; a short to ground indicates a wiring or module issue
If wiring is intact, substitute the passenger airbag module with a known-good unit and re-test
If the code persists, replace the RCM/SDM
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe. The passenger airbag may not deploy properly in a crash, increasing injury risk. Have the vehicle repaired immediately.
How much does it cost to fix?▼
Repair costs typically range from $200 to $1,200, depending on whether the issue is a wiring repair, connector replacement, or airbag module replacement.