What Does B1496 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the decklid (trunk lid) punch-out sensor circuit. This sensor is designed to detect if the decklid emergency release has been activated from inside the trunk, typically a safety feature to prevent entrapment. The BCM has identified that the sensor circuit is not completing properly, either due to wiring damage, connector issues, or sensor failure.
Common Causes
45%
Damaged or corroded wiring harness and connectors in the decklid flex area
30%
Failed decklid punch-out sensor or emergency release mechanism
15%
Broken or disconnected sensor connector at trunk latch assembly
10%
BCM internal fault or poor BCM ground connection
Diagnostic Steps
1
Step 1: Perform visual inspection of the trunk lid emergency release area and locate the punch-out sensor. Check for obvious physical damage, missing components, or disconnected wiring. Inspect the wiring harness where it flexes between body and decklid for chafing or breaks.
2
Step 2: Using a digital multimeter, check for continuity at the punch-out sensor connector (disconnected from harness). A functional sensor should show continuity when activated and infinite resistance when not activated. Compare readings to vehicle-specific specifications.
3
Step 3: Back-probe the sensor harness connector with multimeter and check for proper voltage supply (typically 5V or 12V reference) from BCM on the signal wire. Also verify ground circuit shows less than 0.5 ohms resistance to chassis ground.
4
Step 4: If voltage and ground are present at connector but sensor tests bad, replace the punch-out sensor. If no voltage at connector, trace wiring back toward BCM checking for opens, shorts to ground, or damaged flex sections in the decklid hinge area.
5
Step 5: After repair, clear codes, cycle the emergency release mechanism multiple times, and verify the BCM now recognizes sensor operation correctly. Test trunk opening and closing functions to ensure proper circuit operation.
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an open circuit in the decklid (trunk lid) punch-out sensor circuit. This sensor is designed to detect if the decklid emergency release has been activated from inside the trunk, typically a safety feature to prevent entrapment. The BCM h...
The most common cause of B1496 (Decklid Punch-Out Sensor Open Circuit) is: Damaged or corroded wiring harness and connectors in the decklid flex area
Typical repair costs for B1496 range from $120 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive, but the trunk emergency release safety feature may not function properly, which could be a safety concern if someone becomes trapped inside. Repair should be completed within a reasonable timeframe to restore this safety feature.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1496 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Security System
Difficulty
Type
Manufacturer
Recommended Tools
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