What Does B2122 Mean?
This code indicates that the Body Control Module (BCM) has detected a short to ground condition in the driver side satellite communication circuit. This circuit is part of the vehicle's occupant detection and safety system, specifically related to the satellite crash sensor or side impact sensor module on the driver's side. The BCM has identified that the communication wire or sensor circuit has an unintended connection to vehicle ground, disrupting normal signal transmission.
Common Causes
45%
Damaged or chafed wiring harness between BCM and driver side satellite sensor, causing wire insulation breakdown and contact with vehicle ground
30%
Corroded or moisture-damaged driver side satellite sensor connector pins creating a ground path
15%
Failed driver side satellite crash sensor or side impact sensor module with internal short to ground
10%
BCM internal circuit fault or damaged BCM connector causing false short to ground detection
Diagnostic Steps
1
Step 1: Perform visual inspection of the driver side satellite sensor location (typically in driver door, B-pillar, or front fender area). Check for physical damage, water intrusion, or visible wire damage. Inspect connector for corrosion, bent pins, or moisture.
2
Step 2: Disconnect the driver side satellite sensor connector at the sensor. Using a digital multimeter, measure resistance between the sensor's communication circuit pin and known good vehicle ground. Should read infinite resistance (open circuit). If reading shows continuity (0-5 ohms), wiring harness has short to ground.
3
Step 3: If wiring shows short, disconnect BCM connector. Measure resistance from sensor circuit wire at BCM connector to ground. If short remains, harness is shorted between sensor and BCM. If short disappears, problem is in BCM. Inspect entire wire route for pinch points, especially door jamb areas and behind kick panels.
4
Step 4: If wiring tests good, reconnect harness and measure resistance across sensor terminals per manufacturer specifications (typically 0.5-5 ohms depending on sensor type). Compare to opposite side sensor. If sensor shows 0 ohms to ground or significantly different reading, replace sensor.
5
Step 5: After repairs, clear codes and perform a test drive including door opening/closing cycles. Verify code does not return and satellite sensor communication is functioning properly using live data monitoring of sensor status.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected a short to ground condition in the driver side satellite communication circuit. This circuit is part of the vehicle's occupant detection and safety system, specifically related to the satellite crash sensor or side impact sensor mod...
The most common cause of B2122 (Driver Side Satellite Communication Circuit Short to Ground) is: Damaged or chafed wiring harness between BCM and driver side satellite sensor, causing wire insulation breakdown and contact with vehicle ground
Typical repair costs for B2122 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive, but the side airbag or side impact detection system on the driver side may not function properly in a collision. Repair should be completed promptly to ensure full occupant protection system functionality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2122 to identify the root cause.
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Quick Info
Category
Body
System
Occupant Safety System / Side Impact Detection System
Difficulty
Type
Generic (SAE)
Recommended Tools
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