Driver Mirror Horizontal Feedback Circuit Malfunction
The B2320 code indicates a fault in the driver's side mirror horizontal feedback potentiometer circuit. This potentiometer is a position sensor that monitors the horizontal movement of the driver's exterior mirror, sending a variable voltage signal to the control module. When the module detects a signal outside the expected range, an erratic signal, or no response from the potentiometer, it sets this code.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or worn driver mirror feedback potentiometer
- Open, shorted, or high-resistance wiring in the potentiometer circuit
- Corroded, loose, or moisture-contaminated mirror connector
- Internal mirror motor failure affecting the integrated potentiometer
- Faulty seat or mirror control module (depending on vehicle architecture)
3. Symptoms You Will Notice
- Driver mirror does not adjust horizontally or moves erratically
- Mirror position memory function may not work
4. Step-by-Step Diagnosis
Scan for additional codes and verify B2320 is present
Inspect mirror connector for corrosion, damage, or loose pins
Test potentiometer signal voltage and ground circuits with a multimeter
Check for open or short circuits in wiring between mirror and control module
If wiring and connector are good, replace the mirror assembly (potentiometer is typically not serviceable separately)
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The fault only affects the driver mirror's horizontal adjustment and memory function, not the vehicle's safety systems.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on whether the mirror assembly needs replacement and labor rates.