Driver Side Satellite Communication Circuit Short to Ground
The driver's satellite communication antenna or its wiring has a short circuit touching ground, like a broken wire touching the metal frame. This prevents the vehicle's telematics system from sending or receiving signals properly.
The body control module monitors the voltage and resistance of the satellite communication circuit during normal operation. It detects abnormally low resistance or voltage dropout that indicates a short to ground rather than normal circuit impedance. When resistance falls below the fault threshold, the module sets a diagnostic trouble code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Circuit Voltage | 12V nominal supply | Below 2V or shorted to ground |
| Circuit Resistance | High impedance (typical load) | Below 50 ohms (short to ground) |
Code B2122 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B2122 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.