Driver Mirror Vertical Feedback Short to Battery
The B2326 code indicates that the driver's mirror control module has detected a short to battery positive (B+) in the vertical feedback potentiometer circuit. This potentiometer is a resistive position sensor that tells the module the current vertical angle of the mirror, enabling precise position control and memory functions. A short to battery causes the feedback signal to stay at a constant maximum value, preventing accurate vertical movement control and potentially affecting memory and auto-fold features.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged wiring in the potentiometer circuit contacting B+ power
- Vertical position potentiometer internally shorted
- Mirror connector with bent pins, corrosion, or water intrusion
- Faulty memory mirror module
- Short circuit in the harness between the mirror and control module
3. Symptoms You Will Notice
- Driver mirror does not adjust vertically or moves erratically
- Mirror memory position not recalled correctly
- Auto-fold function may not work
4. Step-by-Step Diagnosis
Scan for codes and verify B2326 is present
Visually inspect mirror connector for damage, corrosion, or bent pins
Test vertical feedback potentiometer signal voltage at module connector
Check for short to B+ in wiring between mirror and module
If wiring and potentiometer are good, suspect faulty memory mirror module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is safe to drive. The issue only affects the driver mirror's vertical adjustment and memory functions, not safety systems.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the fix involves wiring repair, connector cleaning, or module replacement.