What Does B2240 Mean?
This code indicates the Body Control Module (BCM) has detected that the rear cargo door reset switch circuit is shorted to ground. The reset switch, typically used to recalibrate or initialize power liftgate/tailgate operation, is sending a constant closed signal when it should be open. This prevents normal operation of the power rear cargo door system and may disable automatic functions.
Common Causes
45%
Damaged wiring harness or chafed wire in the rear cargo door causing short to ground
30%
Failed or internally shorted rear cargo door reset switch
15%
Water intrusion or corrosion in switch connector causing ground path
10%
Body Control Module internal fault or damaged BCM connector pin
Diagnostic Steps
1
Step 1: Perform visual inspection of the rear cargo door reset switch, its connector, and wiring harness. Look for physical damage, corrosion, water intrusion, or chafed wires especially where the harness flexes between body and door. Check for pinched wires in hinge area.
2
Step 2: Disconnect the reset switch connector and use a digital multimeter to measure resistance from the switch signal wire to ground with ignition off. Reading should be infinite (OL). If continuity exists, trace and repair the short in the harness between switch and BCM.
3
Step 3: With switch connector still disconnected, measure resistance across the switch terminals. Should read open circuit (infinite resistance) in normal position. Manually actuate switch and verify it closes. If switch shows continuity when not pressed or fails to open, replace the switch.
4
Step 4: Inspect the BCM connector for bent pins, corrosion, or pushed-out terminals on the reset switch circuit pin. If harness and switch test good, check BCM ground connections are clean and tight.
5
Step 5: Reconnect all components, clear codes, and cycle the rear cargo door through full operation. Verify code does not return and reset function operates normally. Monitor live data for switch state changes.
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected that the rear cargo door reset switch circuit is shorted to ground. The reset switch, typically used to recalibrate or initialize power liftgate/tailgate operation, is sending a constant closed signal when it should be open. This prevent...
The most common cause of B2240 (Rear Cargo Door Reset Switch Stuck (Short to Ground)) is: Damaged wiring harness or chafed wire in the rear cargo door causing short to ground
Typical repair costs for B2240 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this affects only the power cargo door reset function. The rear door may still operate manually or with reduced automatic functionality. Repair at convenience to restore full power liftgate features.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2240 to identify the root cause.
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Quick Info
Category
Body
System
Power Liftgate/Tailgate System (Body Electrical)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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