What Does B2323 Mean?
This diagnostic trouble code indicates that the Body Control Module (BCM) has detected a short to ground in the feedback potentiometer circuit for the driver's side mirror horizontal adjustment motor. The feedback potentiometer provides position information to the BCM to ensure accurate mirror positioning. When this circuit is shorted to ground, the BCM cannot accurately determine or control the horizontal position of the driver's side mirror.
Common Causes
45%
Damaged or chafed wiring in the door harness between the door jamb and mirror assembly, causing the feedback potentiometer signal wire to contact ground
30%
Failed mirror adjustment motor assembly with internal potentiometer short to ground
15%
Corroded or water-damaged mirror connector causing cross-circuit contamination to ground
10%
Faulty Body Control Module with internal driver circuit failure
Diagnostic Steps
1
Step 1: Perform a visual inspection of the driver's side mirror wiring harness, especially in the door jamb flex area where wires commonly break or chafe. Look for damaged insulation, exposed copper, or signs of wear and pinching.
2
Step 2: Disconnect the mirror connector and use a digital multimeter to measure resistance between the horizontal feedback potentiometer signal wire (typically 5V reference circuit) and ground. Reading should be greater than 10k ohms; a reading near 0 ohms confirms a short to ground in the harness or mirror assembly.
3
Step 3: With the mirror still disconnected, check the same circuit at the BCM connector. If resistance to ground is still near 0 ohms, the short is in the vehicle harness between BCM and mirror. If resistance is now normal (high), the short is internal to the mirror assembly.
4
Step 4: If harness tests good, connect a known-good mirror assembly or measure the internal potentiometer resistance (typically 1-10k ohms sweep) to confirm mirror failure. Replace faulty component and verify proper mirror operation and code clearing.
5
Step 5: Check for proper mirror adjustment function in all directions using mirror switch, ensuring smooth operation without binding or erratic movement that could indicate mechanical issues causing electrical problems.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This diagnostic trouble code indicates that the Body Control Module (BCM) has detected a short to ground in the feedback potentiometer circuit for the driver's side mirror horizontal adjustment motor. The feedback potentiometer provides position information to the BCM to ensure accurate mirror posit...
The most common cause of B2323 (Mirror Driver Horizontal Feedback Potentiometer Circuit Short to Ground) is: Damaged or chafed wiring in the door harness between the door jamb and mirror assembly, causing the feedback potentiometer signal wire to contact ground
Typical repair costs for B2323 range from $150 to $650, 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 and it is safe to continue driving. The driver's side mirror may not adjust properly in the horizontal direction, which could impact visibility during lane changes, but manual adjustment is typically still possible.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2323 to identify the root cause.
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Quick Info
Category
Body
System
Power Accessories / Mirror Adjustment System
Difficulty
Type
Generic (SAE)
Recommended Tools
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