What Does B1337 Mean?
This code indicates that the Body Control Module (BCM) has detected a short to battery voltage in the rear right door ajar switch circuit. The BCM is continuously receiving a voltage signal on the door ajar circuit when it should be seeing a ground or open circuit signal. This causes the system to incorrectly register the rear right door as open even when it is properly closed.
Common Causes
45%
Damaged or chafed wiring harness causing short to battery voltage between BCM and door ajar switch
30%
Faulty rear right door ajar switch with internal short to power
15%
Water intrusion or corrosion in door ajar switch connector causing short circuit
10%
Failed Body Control Module with internal circuit fault
Diagnostic Steps
1
Step 1: Visually inspect the rear right door jamb area and door ajar switch for visible damage, water intrusion, corrosion, or damaged wiring. Check wire routing through door hinge area for chafing or pinched wires.
2
Step 2: Disconnect the rear right door ajar switch connector and use a digital multimeter to measure voltage at the BCM-side connector terminal. Should read 0V with ignition on; if battery voltage is present, wiring has short to power.
3
Step 3: With door ajar switch still disconnected, check if DTC clears and door ajar indicator turns off. If fault persists with switch disconnected, problem is in wiring harness or BCM.
4
Step 4: Perform continuity test on door ajar switch in both open and closed positions. Switch should show continuity to ground when door is open, and open circuit when door is closed. Any reading showing battery voltage indicates failed switch.
5
Step 5: Inspect wiring harness from door jamb through body and to BCM, paying special attention to flex points at door hinge area. Use multimeter to test for shorts to battery voltage along entire circuit length.
6
Step 6: After repair, clear codes, cycle door open and closed multiple times, and verify door ajar indicator functions correctly and DTC does not return.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected a short to battery voltage in the rear right door ajar switch circuit. The BCM is continuously receiving a voltage signal on the door ajar circuit when it should be seeing a ground or open circuit signal. This causes the system to i...
The most common cause of B1337 (Door Ajar RR Circuit Short To Battery) is: Damaged or chafed wiring harness causing short to battery voltage between BCM and door ajar switch
Typical repair costs for B1337 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving. Main concerns are interior lights remaining on causing battery drain, inability to arm security system, and potential distraction from false door ajar warnings. Repair at earliest convenience to prevent battery discharge.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1337 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Interior Lighting System
Difficulty
Type
Manufacturer
Recommended Tools
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