What Does B2242 Mean?
This diagnostic trouble code indicates that the Body Control Module (BCM) has detected an open circuit in the rear cargo door unlock control circuit. The BCM continuously monitors the electrical continuity of the unlock actuator circuit and sets this code when it cannot complete the circuit path, meaning there is a break in the wiring, a failed connection, or a faulty actuator. This prevents the rear cargo door from being unlocked electronically via the key fob, interior switch, or power door lock system.
Common Causes
35%
Damaged or corroded wiring harness between BCM and rear cargo door lock actuator, often caused by repeated door opening/closing flexing the wires
30%
Failed rear cargo door lock actuator with internal open circuit or broken motor winding
25%
Loose, corroded, or disconnected electrical connector at the rear cargo door lock actuator or BCM
10%
Failed Body Control Module with internal circuit failure on unlock output driver
Diagnostic Steps
1
Step 1: Perform visual inspection of the rear cargo door lock actuator connector and wiring harness, checking for obvious damage, corrosion, water intrusion, disconnected terminals, or broken wires especially in the door jamb flex area
2
Step 2: Using a digital multimeter, backprobe the unlock circuit at the rear cargo door lock actuator connector while commanded active through the scan tool; verify presence of battery voltage (typically 12V) during unlock command and ground signal
3
Step 3: If no voltage is present at actuator during command, disconnect the actuator connector and measure resistance of the unlock circuit wiring from BCM to actuator connector (should be less than 5 ohms); infinite resistance confirms open circuit in wiring
4
Step 4: If voltage and ground are present at connector, remove and bench test the lock actuator by applying direct battery voltage and ground to unlock terminals; if actuator does not operate, replace actuator
5
Step 5: Repair any identified open circuits in wiring harness, replace corroded connectors, or replace faulty actuator as determined by testing
6
Step 6: Clear codes, cycle the rear cargo door unlock function multiple times using key fob and interior controls, then verify code does not return and proper operation is restored
Estimated Repair Cost
$150 - $550
Parts + labor, varies by vehicle and location
This diagnostic trouble code indicates that the Body Control Module (BCM) has detected an open circuit in the rear cargo door unlock control circuit. The BCM continuously monitors the electrical continuity of the unlock actuator circuit and sets this code when it cannot complete the circuit path, me...
The most common cause of B2242 (Rear Cargo Door Unlock Circuit Open) is: Damaged or corroded wiring harness between BCM and rear cargo door lock actuator, often caused by repeated door opening/closing flexing the wires
Typical repair costs for B2242 range from $150 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle drivability or safety and it is safe to continue driving. The only impact is the inability to electronically unlock the rear cargo door, though manual unlocking may still be possible depending on vehicle design.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2242 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Body
System
Body Control and Security System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
