What Does B1327 Mean?
This code indicates the Body Control Module (BCM) has detected a malfunction in the passenger door ajar switch circuit. The BCM monitors the door switch to determine if the passenger door is open or closed, and this fault means the circuit is providing an incorrect, intermittent, or no signal. This can affect interior lighting, security systems, and climate control functions that rely on knowing door position.
Common Causes
45%
Faulty or misaligned passenger door ajar switch/latch assembly
30%
Damaged, corroded, or loose wiring/connectors in passenger door harness
15%
Water intrusion or corrosion at door switch connector
10%
Body Control Module (BCM) internal fault or software issue
Diagnostic Steps
1
Step 1: Visually inspect the passenger door ajar switch and latch assembly for physical damage, misalignment, or debris preventing proper operation. Open and close door multiple times while observing interior lights and dash indicator behavior.
2
Step 2: Using a multimeter, test the door ajar switch continuity by accessing the connector at the door jamb or latch. Check for proper resistance change between open and closed door positions (typically open circuit when closed, ground or low resistance when open).
3
Step 3: Inspect wiring harness from door jamb through the door hinge area to the BCM for chafing, breaks, or corrosion. Pay special attention to the boot area where wires flex during door operation. Check connector terminals for corrosion, bent pins, or moisture intrusion.
4
Step 4: With scan tool monitoring live data, actuate the door ajar switch manually and verify BCM receives proper signal change. Compare passenger door switch readings to driver door for reference.
5
Step 5: If switch and wiring test good, perform BCM parameter reset or reprogramming per manufacturer procedures. If fault persists after reset, suspect BCM internal fault and consider BCM replacement after confirming all other circuits test normally.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a malfunction in the passenger door ajar switch circuit. The BCM monitors the door switch to determine if the passenger door is open or closed, and this fault means the circuit is providing an incorrect, intermittent, or no signal. This ...
The most common cause of B1327 (Passenger Door Ajar Circuit Failure) is: Faulty or misaligned passenger door ajar switch/latch assembly
Typical repair costs for B1327 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 as this does not affect vehicle operation or braking systems. However, interior lights may remain on draining the battery, security system may not arm properly, and dashboard warnings may be annoying or mask other legitimate warnings.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1327 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Convenience Systems
Difficulty
Type
Manufacturer
Recommended Tools
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