What Does B2324 Mean?
This code indicates the Body Control Module (BCM) has detected a fault in the feedback circuit for the driver's side mirror vertical adjustment potentiometer. The potentiometer provides position feedback to the BCM during mirror adjustment, and the module has detected an abnormal voltage, open circuit, short circuit, or loss of signal from this sensor. This prevents proper vertical adjustment of the driver's side mirror.
Common Causes
40%
Failed or worn mirror vertical adjustment potentiometer internal to the mirror assembly
30%
Damaged, corroded, or loose wiring and connectors between mirror and BCM
20%
Water intrusion or corrosion inside mirror housing damaging potentiometer circuit
10%
Faulty Body Control Module (BCM) mirror control circuit or internal power supply issue
Diagnostic Steps
1
Step 1: Perform visual inspection of driver's side mirror assembly for physical damage, water intrusion, or signs of corrosion. Check mirror connector at door for corrosion, bent pins, or looseness.
2
Step 2: Using a digital multimeter, backprobe the potentiometer feedback wire at the mirror connector (typically 5V reference, ground, and signal wire). With ignition on, measure reference voltage (should be approximately 5V) and ground continuity (less than 1 ohm).
3
Step 3: Monitor potentiometer signal voltage while manually moving mirror vertically through full range of motion. Signal should sweep smoothly from approximately 0.5V to 4.5V. Erratic readings, no change, or out-of-range voltage indicates potentiometer failure.
4
Step 4: If voltage readings are correct at mirror, check continuity and resistance of mirror harness from mirror connector through door jamb to BCM connector. Look for opens, shorts to ground, or resistance above 5 ohms indicating damaged wiring.
5
Step 5: If all wiring and voltages test normal, suspect internal BCM fault. Test mirror motor operation in both directions to confirm motor function, then consider BCM replacement or mirror assembly replacement based on test results.
6
Step 6: After repair, clear codes, cycle mirror through full vertical range multiple times, and verify code does not return. Test mirror memory function if equipped.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a fault in the feedback circuit for the driver's side mirror vertical adjustment potentiometer. The potentiometer provides position feedback to the BCM during mirror adjustment, and the module has detected an abnormal voltage, open circu...
The most common cause of B2324 (Mirror Driver Vertical Feedback Potentiometer Circuit Failure) is: Failed or worn mirror vertical adjustment potentiometer internal to the mirror assembly
Typical repair costs for B2324 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving. This is a convenience feature failure that does not affect vehicle safety or operation. Repair at your convenience, though proper mirror adjustment is important for visibility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2324 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical - Mirror Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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