B2321 Code: Mirror Driver Horizontal Feedback Potentiometer Circuit Open

🟢 Low severity · drivable

Safe to drive. This affects only the power mirror position feedback.

What B2321 means

The horizontal position sensor (potentiometer) circuit in the driver's power mirror is open, so the mirror adjustment system can't read the mirror's position.

Symptoms

Power mirror adjusting erratically
Mirror won't return to saved position
No driving symptoms

Common causes

most common: Faulty mirror position potentiometer (open)
common: Open or broken mirror wiring
less common: Loose mirror connector

How to fix it

Fix	DIY?	Typical cost
Check the mirror wiring and connector	Yes	$0–50
Replace the power mirror assembly	Yes	$100–300

Frequently asked questions

Can I drive with a B2321 code?

Yes. It only affects the power mirror position feedback.

What is the most common cause of B2321?

A faulty mirror position potentiometer, usually fixed by replacing the mirror assembly.

How much does it cost to fix a B2321?

Typically $100–$300 for a replacement power mirror.

Related codes

B2320

B2320 Code: Mirror Driver Horizontal Feedback Potentiometer Circuit Failure

B2322

B2322 Code: Mirror Driver Horizontal Feedback Potentiometer Circuit Short to Battery

B2323

B2323 Code: Mirror Driver Horizontal Feedback Potentiometer Circuit Short to Ground

Updated 2026-08. This page is informational and not a substitute for professional diagnosis.