What Does B1336 Mean?
This diagnostic trouble code indicates that the Body Control Module (BCM) has detected an open circuit in the rear right door ajar switch or its associated wiring. The BCM monitors door switches to determine if doors are open or closed for interior lighting, security systems, and driver notification. An open circuit means the electrical path is interrupted, preventing the BCM from receiving proper door status signals.
Common Causes
40%
Faulty or stuck rear right door ajar switch/latch assembly
30%
Broken or corroded wiring between door switch and BCM
20%
Loose or corroded electrical connector at door switch or BCM
10%
Failed Body Control Module (BCM) internal circuit
Diagnostic Steps
1
Step 1: Visually inspect the rear right door ajar switch and surrounding latch assembly for physical damage, misalignment, or debris preventing proper operation. Manually activate the switch by opening and closing the door while observing dash indicators.
2
Step 2: Using a digital multimeter, backprobe the rear right door switch connector and check for continuity between switch terminals when door is open versus closed. Expected reading should show continuity (0-5 ohms) when door is open and infinite resistance when closed, or vice versa depending on switch design.
3
Step 3: Inspect the door jamb wiring harness for breaks, chafing, or corrosion where harness flexes between door and body. Flex the harness while monitoring voltage/continuity to identify intermittent opens. Pay special attention to rubber boot area where wires pass through.
4
Step 4: Disconnect the door switch connector and measure resistance from the BCM connector side of the circuit to ground. Should read infinite resistance (open circuit) indicating no short to ground. Then check continuity from BCM connector to door switch connector to verify wiring integrity.
5
Step 5: If all wiring and switch test normal, perform BCM voltage supply test at door switch connector. Verify BCM is providing proper reference voltage (typically 5V or 12V depending on manufacturer). If voltage is absent, suspect BCM internal fault.
6
Step 6: After repairs, clear codes and cycle the rear right door open and closed multiple times while monitoring live data to confirm BCM is receiving proper door status signals and code does not return.
Estimated Repair Cost
$75 - $400
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 right door ajar switch or its associated wiring. The BCM monitors door switches to determine if doors are open or closed for interior lighting, security systems, and driver notification...
The most common cause of B1336 (Door Ajar RR Circuit Open) is: Faulty or stuck rear right door ajar switch/latch assembly
Typical repair costs for B1336 range from $75 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle safety or drivability. The primary concern is interior lights may remain on draining the battery, security system may not arm properly, and dashboard door ajar warning will be constantly displayed. Repair at earliest convenience to prevent battery drain.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1336 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System
Difficulty
Type
Manufacturer
Recommended Tools
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