What Does B2448 Mean?
This code indicates that the Body Control Module (BCM) has detected an abnormal low voltage condition on the input circuit for the RESCU (Remote Emergency Satellite Cellular Unit) or VEMS (Vehicle Emergency Messaging System). The circuit voltage is reading at or near ground potential when it should be reading a reference voltage, indicating a short to ground condition in the wiring, connector, or module itself. This fault prevents proper communication with emergency response systems.
Common Causes
45%
Damaged, chafed, or pinched wiring harness causing short to ground between RESCU/VEMS module and BCM
30%
Corroded or moisture-damaged connector terminals at RESCU/VEMS module or BCM causing internal short
15%
Failed RESCU/VEMS module with internal short circuit on input pin
10%
Failed Body Control Module with shorted input circuit or damaged internal driver
Diagnostic Steps
1
Step 1: Perform visual inspection of RESCU/VEMS module harness routing, checking for pinch points near body panels, chassis grounds, and sharp edges. Look for evidence of chafing, melted insulation, or harness damage especially near roof area where antennas typically mount.
2
Step 2: Disconnect RESCU/VEMS module connector and inspect terminals for corrosion, pushed-back pins, or moisture intrusion. Use multimeter to measure resistance between the signal input circuit pin (refer to wiring diagram) and chassis ground with BCM connected - should read greater than 10k ohms. If low resistance persists, harness is shorted.
3
Step 3: With RESCU/VEMS module disconnected, backprobe the BCM connector signal output pin and measure voltage - should read reference voltage (typically 5V or 12V depending on system). If voltage reads near 0V, BCM output driver is likely failed.
4
Step 4: If harness tests good and BCM provides proper reference voltage, reconnect harness to BCM only and measure voltage at RESCU/VEMS module connector signal pin - should match BCM output. If voltage drops to ground, harness has intermittent short. If voltage is correct, replace RESCU/VEMS module.
5
Step 5: After repairs, clear codes and perform functional test of emergency communication system using manufacturer-specific test procedures. Monitor live data for proper signal voltage and verify code does not return.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected an abnormal low voltage condition on the input circuit for the RESCU (Remote Emergency Satellite Cellular Unit) or VEMS (Vehicle Emergency Messaging System). The circuit voltage is reading at or near ground potential when it should ...
The most common cause of B2448 (RESCU/VEMS Input Circuit Short to Ground) is: Damaged, chafed, or pinched wiring harness causing short to ground between RESCU/VEMS module and BCM
Typical repair costs for B2448 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive, but emergency assistance features (automatic crash notification, SOS button) will be inoperative. Repair within 1-2 weeks recommended to restore emergency communication capability for occupant safety.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2448 to identify the root cause.
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Quick Info
Category
Body
System
Emergency Communication System / Body Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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