What Does B2243 Mean?
This code indicates that the Body Control Module (BCM) has detected an open circuit in the driver rear door ajar switch circuit. The BCM monitors door ajar switches to determine door position for security, interior lighting, and warning systems. An open circuit means the electrical signal from the door switch is not reaching the BCM, preventing proper detection of door status.
Common Causes
40%
Faulty or misaligned door ajar switch/latch assembly
30%
Broken or corroded wiring between door switch and BCM
20%
Damaged or corroded connector at door switch or BCM
10%
Failed Body Control Module
Diagnostic Steps
1
Step 1: Perform visual inspection of the driver rear door ajar switch and latch assembly for physical damage, misalignment, or debris preventing proper contact
2
Step 2: Using a digital multimeter, test continuity of the door ajar switch by manually actuating it while measuring resistance (should toggle between open circuit and 0-5 ohms when closed)
3
Step 3: Inspect wiring harness and connector at the door jamb flex point for broken wires, chafing, corrosion, or water intrusion; repair or replace damaged sections as needed
4
Step 4: Back-probe the door switch connector with a multimeter and measure voltage/ground signals while comparing to manufacturer specifications (typically 5V reference or ground signal)
5
Step 5: If all wiring and switch tests pass, inspect BCM connector terminals for corrosion, bent pins, or poor contact; clean and repair as necessary
6
Step 6: Clear codes and verify repair by cycling door open and closed while monitoring live data stream to confirm BCM receives proper door status signals
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected an open circuit in the driver rear door ajar switch circuit. The BCM monitors door ajar switches to determine door position for security, interior lighting, and warning systems. An open circuit means the electrical signal from the d...
The most common cause of B2243 (Driver Rear Door Ajar Circuit Open) is: Faulty or misaligned door ajar switch/latch assembly
Typical repair costs for B2243 range from $75 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is safe to drive with no immediate safety concerns. The main inconvenience is that interior lights may stay on, door ajar warning may illuminate continuously, and security features may not function properly, potentially draining the battery if left unrepaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2243 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Security System
Difficulty
Type
Generic (SAE)
Recommended Tools
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