What Does B2425 Mean?
This code indicates that the remote keyless entry (RKE) system has lost synchronization between the key fob transmitter and the vehicle's body control module (BCM). The BCM uses a rolling code security system that requires the fob and receiver to maintain synchronized encryption codes. When the fob is pressed too many times outside the vehicle's range, or after battery replacement, the codes fall out of sync and the BCM rejects the fob's signals.
Common Causes
45%
Key fob buttons pressed repeatedly outside vehicle range causing rolling code desynchronization
30%
Weak or depleted key fob battery causing intermittent signal transmission
15%
RKE receiver antenna module failure or poor ground connection in BCM circuit
10%
Body control module software corruption or memory fault requiring reprogramming
Diagnostic Steps
1
Step 1: Verify key fob battery voltage using multimeter (should be 3.0V or higher for CR2032 type); replace if below 2.8V and test operation
2
Step 2: Attempt manual resynchronization procedure per manufacturer protocol (typically involves cycling ignition and pressing lock/unlock buttons in specific sequence within 30 seconds)
3
Step 3: Using scan tool, monitor RKE signal strength and BCM communication while pressing fob buttons at various distances (1-10 feet) to verify receiver antenna operation
4
Step 4: Check BCM ground connections and wiring harness at RKE antenna module for corrosion, damage, or loose connections using visual inspection and continuity testing
5
Step 5: If resynchronization fails, use manufacturer scan tool to reprogram or replace key fob with new rolling code assignment through BCM learning procedure
6
Step 6: Clear codes, perform complete RKE function test (lock, unlock, panic, trunk release if equipped), and road test to verify repair
Estimated Repair Cost
$0 - $350
Parts + labor, varies by vehicle and location
This code indicates that the remote keyless entry (RKE) system has lost synchronization between the key fob transmitter and the vehicle's body control module (BCM). The BCM uses a rolling code security system that requires the fob and receiver to maintain synchronized encryption codes. When the fob ...
The most common cause of B2425 (Remote Keyless Entry Out of Synchronization) is: Key fob buttons pressed repeatedly outside vehicle range causing rolling code desynchronization
Typical repair costs for B2425 range from $0 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this does not affect vehicle operation or safety systems. The only inconvenience is requiring manual key use for locking/unlocking until repaired. No urgency beyond personal convenience.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2425 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Remote Keyless Entry System
Difficulty
Type
Generic (SAE)
Recommended Tools
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