What Does B2446 Mean?
This code indicates that the Body Control Module (BCM) has detected an open circuit in the RESCU (Remote Emergency Satellite Cellular Unit) or VEMS (Vehicle Emergency Messaging System) input circuit. The module is not receiving proper voltage or signal from the emergency communication system due to a break in the circuit, damaged wiring, or connector issue. This system is designed to provide emergency communication services and automatic crash notification.
Common Causes
45%
Damaged, corroded, or disconnected wiring harness or connectors between BCM and RESCU/VEMS module
30%
Failed or damaged RESCU/VEMS module itself with internal circuit failure
15%
Blown fuse or faulty power supply circuit to RESCU/VEMS system
10%
Body Control Module (BCM) internal fault or programming issue
Diagnostic Steps
1
Step 1: Perform visual inspection of RESCU/VEMS module location (typically in headliner, overhead console, or behind rearview mirror) and check all connectors for proper seating, corrosion, bent pins, and physical damage
2
Step 2: Using a digital multimeter, verify power and ground supply to the RESCU/VEMS module at the connector (check for battery voltage on power circuits and less than 0.5 ohms resistance to ground on ground circuits)
3
Step 3: Check the specific fuse(s) for the RESCU/VEMS system in the fuse box (consult vehicle-specific wiring diagram) and verify continuity in the circuit between BCM and RESCU module using a multimeter
4
Step 4: Inspect the wiring harness between the BCM and RESCU/VEMS module for cuts, chafing, or damage, paying special attention to areas where harness passes through firewall, door jambs, or near moving components
5
Step 5: If all wiring and connections test good, test the RESCU/VEMS module by substituting with a known good unit or by checking module communication using manufacturer-specific diagnostic software
6
Step 6: Clear the code, operate the system, and verify repair by confirming the code does not return and the emergency communication system responds properly to test procedures
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected an open circuit in the RESCU (Remote Emergency Satellite Cellular Unit) or VEMS (Vehicle Emergency Messaging System) input circuit. The module is not receiving proper voltage or signal from the emergency communication system due to ...
The most common cause of B2446 (RESCU/VEMS Input Circuit Open) is: Damaged, corroded, or disconnected wiring harness or connectors between BCM and RESCU/VEMS module
Typical repair costs for B2446 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive normally, but the emergency communication and automatic crash notification features will be non-functional. If an accident occurs, automatic emergency services notification may not work, requiring manual calls for assistance. Repair is recommended but not immediately urgent for basic vehicle operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2446 to identify the root cause.
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Quick Info
Category
Body
System
Emergency Communication System / Body Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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