What Does B2495 Mean?
This code indicates the Body Control Module (BCM) has detected a malfunction in the circuit that controls the horn output for the anti-theft security system. The BCM is unable to properly activate or communicate with the horn relay or horn circuit when the alarm system is triggered. This fault prevents the audible alarm from functioning during a security event, compromising the vehicle's theft deterrent system.
Common Causes
35%
Failed horn relay or corroded/loose connections at the horn relay socket
30%
Damaged wiring harness or broken wire between BCM and horn relay/horn
20%
Faulty horn assembly with open circuit or internal failure
10%
Failed Body Control Module internal horn driver circuit
5%
Blown fuse in horn circuit or poor fuse box connections
Diagnostic Steps
1
Step 1: Visually inspect the horn fuse in the fuse box and verify it has continuity using a multimeter; check for corrosion or loose connections at the fuse terminals
2
Step 2: Locate the horn relay (typically in the engine bay fuse/relay box) and inspect for corrosion or damage; swap with a known good relay of same type to rule out relay failure
3
Step 3: Using a multimeter, test for battery voltage at the horn relay power supply terminal and verify ground continuity; then test for BCM trigger signal at the relay control terminal when alarm is activated
4
Step 4: Disconnect the horn connector and test horn operation by applying direct battery voltage to horn terminals; if horn sounds, check for voltage at horn connector during alarm activation
5
Step 5: Inspect wiring harness between BCM and horn relay for chafing, cuts, or pinched wires; check all connector terminals for corrosion, backed-out pins, or poor contact
6
Step 6: If all previous tests pass, verify BCM output by back-probing the BCM connector at the horn control circuit pin with a test light while triggering the alarm; lack of signal indicates BCM internal fault
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a malfunction in the circuit that controls the horn output for the anti-theft security system. The BCM is unable to properly activate or communicate with the horn relay or horn circuit when the alarm system is triggered. This fault preve...
The most common cause of B2495 (ANTI THEFT HORN OUTPUT CIRCUIT Failure) is: Failed horn relay or corroded/loose connections at the horn relay socket
Typical repair costs for B2495 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive normally as this only affects the audible alarm horn function during security events. The anti-theft system may still immobilize the vehicle properly, but without audible warning, theft deterrence is reduced; repair at your convenience.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2495 to identify the root cause.
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Quick Info
Category
Body
System
Anti-Theft Security System
Difficulty
Type
Generic (SAE)
Recommended Tools
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