What Does B2327 Mean?
This code indicates the Body Control Module (BCM) has detected a short to ground in the feedback potentiometer circuit for the driver's side mirror vertical adjustment motor. The feedback potentiometer provides position information to the BCM so it knows when the mirror has reached the desired position. A short to ground means the signal wire is making unintended contact with a ground source, preventing proper position feedback.
Common Causes
45%
Damaged or chafed wiring in the driver's door harness between the BCM and mirror assembly
30%
Failed mirror feedback potentiometer inside the mirror assembly
15%
Corroded or moisture-damaged connector at the mirror or door harness junction
10%
Internal short within the BCM mirror control circuit
Diagnostic Steps
1
Step 1: Visually inspect the driver's door wiring harness for visible damage, chafing, or pinch points, particularly where the harness flexes between the door and body. Check for water intrusion in the door cavity.
2
Step 2: Disconnect the mirror assembly connector and inspect terminals for corrosion, bent pins, or moisture. Using a digital multimeter, measure resistance from the vertical feedback potentiometer signal wire (consult wiring diagram for pin identification) to ground with mirror disconnected. Should read infinite resistance (open circuit).
3
Step 3: With mirror still disconnected, check resistance of the feedback potentiometer within the mirror assembly itself. Manually move the mirror vertical adjustment and observe resistance change (typically 0-5k ohms range). If resistance reads zero ohms or does not change, potentiometer is failed.
4
Step 4: If wiring and mirror potentiometer test good, check continuity from the BCM connector (mirror control circuit) to ground with all components disconnected. Resistance should be infinite. If continuity exists, trace and repair the short in the harness.
5
Step 5: After repair, reconnect all components, clear codes, and cycle the mirror adjustment through full range of motion in both directions. Verify smooth operation and confirm code does not return.
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to ground in the feedback potentiometer circuit for the driver's side mirror vertical adjustment motor. The feedback potentiometer provides position information to the BCM so it knows when the mirror has reached the desired posit...
The most common cause of B2327 (Mirror Driver Vertical Feedback Potentiometer Circuit Short to Ground) is: Damaged or chafed wiring in the driver's door harness between the BCM and mirror assembly
Typical repair costs for B2327 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving. This fault only affects the automatic positioning of the driver's side mirror vertical adjustment. The mirror can typically still be adjusted manually or may function partially, posing no direct safety risk beyond reduced visibility convenience.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2327 to identify the root cause.
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Quick Info
Category
Body
System
Power Mirror Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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