B2447: Telematics Module Short to Battery
The B2447 code indicates that the telematics control module (RESCU/OnStar/VEMS) has detected a short to battery voltage (high voltage) on its signal or power input circuit. This fault prevents proper communication for roadside assistance, remote diagnostics, and emergency services.
1. Commonly Affected Makes
2. Most Common Causes
- Signal or power circuit wiring shorted to B+
- Damaged, corroded, or bent pins in the module connector
- Internally faulty telematics module (RECU/VEMS/OnStar)
- Blown fuse due to circuit overload
- Communication bus issues (Class 2 / GMLAN) affecting the wake-up input
3. Symptoms You Will Notice
- Inoperative OnStar or telematics services
- Check engine light or service vehicle soon light illuminated
4. Step-by-Step Diagnosis
Scan for additional codes and verify B2447 is current
Inspect the telematics module connector for damage or corrosion
Check for battery voltage on signal/power circuits when not expected
Test the module's power and ground circuits, including fuses
If wiring is intact, suspect internal module failure
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive, but telematics services like emergency call and remote diagnostics will be unavailable.
How much does it cost to fix?▼
Repair costs range from $100 to $600, depending on whether the issue is a simple wiring repair or requires module replacement.