What Does B1301 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the power door lock system. An open circuit means there is a break in the electrical pathway preventing current flow to the door lock actuators. This prevents the power door locks from operating properly, either affecting one or multiple doors depending on where the open circuit exists.
Common Causes
40%
Broken or damaged wiring harness between BCM and door lock actuators, often in door hinge area due to flexing
30%
Failed door lock actuator with open internal windings or broken internal connections
20%
Corroded or loose connector terminals at actuator or BCM causing intermittent or complete loss of continuity
10%
Faulty Body Control Module with internal driver circuit failure
Diagnostic Steps
1
Step 1: Perform visual inspection of all door lock wiring, particularly in door jamb areas where harness flexes. Look for frayed wires, pinched insulation, or broken conductors. Check all connectors for corrosion, bent pins, or moisture intrusion.
2
Step 2: Using a digital multimeter, test continuity from BCM door lock output pin(s) to each door lock actuator connector with all connectors disconnected. Should read less than 5 ohms. If open circuit found, isolate to specific harness section.
3
Step 3: Test each door lock actuator individually by disconnecting its connector and measuring resistance across motor terminals. Typical reading is 3-15 ohms. Infinite resistance indicates open motor windings.
4
Step 4: With ignition on, use multimeter to verify BCM is providing voltage output (typically 12V) at door lock circuit when lock/unlock command is given. No voltage indicates BCM internal driver failure.
5
Step 5: Repair identified wiring fault or replace faulty actuator/connector. Clear codes and perform functional test of all door locks using both key fob and door switches to verify repair.
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an open circuit in the power door lock system. An open circuit means there is a break in the electrical pathway preventing current flow to the door lock actuators. This prevents the power door locks from operating properly, either affect...
The most common cause of B1301 (Power Door Lock Circuit Open) is: Broken or damaged wiring harness between BCM and door lock actuators, often in door hinge area due to flexing
Typical repair costs for B1301 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this is a convenience feature only. Security may be compromised if doors cannot be locked remotely, but manual locking is still available. Repair at convenience but address promptly for security reasons.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1301 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System - Power Door Locks
Difficulty
Type
Manufacturer
Recommended Tools
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