What Does B1562 Mean?
This code indicates the Body Control Module (BCM) has detected an abnormal short circuit to ground in the door lock cylinder circuit wiring or switch. The door lock cylinder contains a switch that signals the BCM when the key is turned in the lock, and this circuit is now reading voltage lower than expected due to an unintended ground connection. This typically affects the driver or front passenger door lock cylinder sensing circuit.
Common Causes
45%
Damaged, chafed, or pinched wiring in the door jamb area where wires flex repeatedly during door opening and closing, causing insulation wear and direct contact with vehicle ground
30%
Faulty door lock cylinder switch with internal short to ground or corrosion causing unintended ground path
15%
Water intrusion or corrosion in the door lock cylinder connector causing intermittent or permanent short to ground through moisture bridge
10%
BCM internal fault or damaged BCM connector pins creating false short-to-ground detection
Diagnostic Steps
1
Step 1: Perform visual inspection of the door lock cylinder wiring harness in the door jamb area and along the door edge, looking for chafed, pinched, or damaged wire insulation that may be contacting metal door frame or body panels
2
Step 2: Disconnect the door lock cylinder connector and measure resistance between the signal wire terminal (at harness side) and vehicle ground using a digital multimeter - should read infinite resistance (open circuit). If reading low resistance or continuity, trace and repair the short in the wiring harness
3
Step 3: With connector still disconnected, measure resistance across the lock cylinder switch terminals while operating the key cylinder - should show expected resistance change (typically 500-5000 ohms to open circuit). If reading zero ohms or direct short to ground at any key position, replace the lock cylinder switch
4
Step 4: Inspect the lock cylinder connector and BCM connector for corrosion, moisture, bent pins, or damage. Clean and apply dielectric grease if corrosion present. Check BCM ground connections are clean and tight
5
Step 5: Reconnect all components, clear codes, and perform functional test by operating the key in the door lock cylinder while monitoring live data on scan tool to verify proper signal voltage (typically 5-12V) with no short to ground condition
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an abnormal short circuit to ground in the door lock cylinder circuit wiring or switch. The door lock cylinder contains a switch that signals the BCM when the key is turned in the lock, and this circuit is now reading voltage lower than ...
The most common cause of B1562 (Door Lock Cylinder Circuit Short To Ground) is: Damaged, chafed, or pinched wiring in the door jamb area where wires flex repeatedly during door opening and closing, causing insulation wear and direct contact with vehicle ground
Typical repair costs for B1562 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 does not affect vehicle operation or safety systems. This primarily affects convenience features such as key-operated door lock sensing and may prevent keyless entry or alarm functions from working properly, but repair can be scheduled at convenience.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1562 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Security System
Difficulty
Type
Manufacturer
Recommended Tools
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