What Does B1330 Mean?
This code indicates the Body Control Module (BCM) has detected a short to ground condition in the passenger door ajar switch circuit. The BCM monitors this circuit to determine when the passenger door is open or closed for interior lighting, security systems, and warning indicators. When the circuit voltage is pulled to ground abnormally, the BCM interprets this as a fault and sets this diagnostic trouble code.
Common Causes
40%
Damaged or chafed wiring harness in door jamb area causing short to ground
30%
Faulty passenger door ajar switch stuck closed or internally shorted
20%
Corroded or water-damaged door ajar switch connector creating ground path
10%
Failed Body Control Module with internal circuit fault
Diagnostic Steps
1
Step 1: Visually inspect the passenger door ajar switch wiring harness at the door jamb for visible damage, chafing, pinching, or exposed copper wire that may be grounding against the door frame or body
2
Step 2: Disconnect the passenger door ajar switch connector and use a digital multimeter to measure resistance from the switch signal wire to ground with the door open and closed; should read infinite ohms (open circuit) in both positions if circuit is not shorted
3
Step 3: Inspect the door ajar switch connector terminals for corrosion, bent pins, or moisture intrusion; clean with electrical contact cleaner and check for proper terminal retention
4
Step 4: With connector still disconnected, measure resistance from the BCM side of the harness signal wire to ground; should read infinite ohms, any continuity indicates a wiring harness short between connector and BCM
5
Step 5: If wiring tests good, reconnect connector and test the door ajar switch operation by manually actuating the switch while monitoring live data; replace switch if it shows constant closed/grounded state
6
Step 6: Clear codes, cycle the door open and closed multiple times, and verify repair by confirming code does not return and door ajar warning functions properly
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to ground condition in the passenger door ajar switch circuit. The BCM monitors this circuit to determine when the passenger door is open or closed for interior lighting, security systems, and warning indicators. When the circuit...
The most common cause of B1330 (Passenger Door Ajar Circuit Short To Ground) is: Damaged or chafed wiring harness in door jamb area causing short to ground
Typical repair costs for B1330 range from $75 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle drivability and is safe to continue driving. The primary concern is that interior lights may remain on, potentially draining the battery, and door ajar warnings may be falsely triggered or non-functional.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1330 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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