What Does B2326 Mean?
This code indicates that the Body Control Module (BCM) has detected an abnormal voltage condition in the driver's side mirror vertical position feedback potentiometer circuit. Specifically, the feedback signal wire is showing battery voltage (typically 12-14V) when it should be reading a variable reference voltage (typically 0.5-4.5V). This suggests the circuit is electrically connected to a power source when it shouldn't be, preventing proper mirror position feedback.
Common Causes
45%
Damaged or chafed wiring in door jamb or mirror assembly causing direct short to power wire
30%
Failed mirror motor/potentiometer assembly with internal short to power
15%
Water intrusion or corrosion in mirror connector causing cross-circuit short
10%
Faulty Body Control Module with internal circuit damage
Diagnostic Steps
1
Step 1: Perform visual inspection of driver's mirror wiring harness, focusing on door jamb flex point and mirror base. Look for chafed, pinched, or damaged insulation that could allow contact with power wires.
2
Step 2: Disconnect the driver's mirror electrical connector. Using a digital multimeter, measure voltage on the vertical feedback potentiometer signal wire at the vehicle harness side (BCM side) with ignition on. Reading should be approximately 5V reference; if still showing battery voltage, wiring harness is shorted to power between BCM and connector.
3
Step 3: If Step 2 shows correct reference voltage, reconnect mirror and backprobe the feedback signal wire at the connector. Measure voltage while manually moving mirror vertically. Normal operation shows 0.5-4.5V variable signal; constant battery voltage confirms internal mirror motor/potentiometer short.
4
Step 4: If internal mirror short confirmed, replace mirror motor assembly. If harness short confirmed, repair or replace affected wiring section. Clear codes, cycle mirror through full range of motion, and verify feedback voltage varies smoothly between 0.5-4.5V with no return of DTC.
5
Step 5: Check mirror connector terminals for corrosion, bent pins, or evidence of water intrusion. Clean or repair connector if contamination is present, apply dielectric grease to prevent future moisture issues.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected an abnormal voltage condition in the driver's side mirror vertical position feedback potentiometer circuit. Specifically, the feedback signal wire is showing battery voltage (typically 12-14V) when it should be reading a variable re...
The most common cause of B2326 (Mirror Driver Vertical Feedback Potentiometer Circuit Short to Battery) is: Damaged or chafed wiring in door jamb or mirror assembly causing direct short to power wire
Typical repair costs for B2326 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is safe to continue driving as it only affects power mirror adjustment functionality and does not impact vehicle operation or safety systems. The mirror may not adjust electrically or may move erratically, but can typically be positioned manually if needed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2326 to identify the root cause.
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Quick Info
Category
Body
System
Power Mirror System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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