What are the common causes of B2321?

An open in the driver mirror horizontal feedback circuit. A failed driver exterior mirror potentiometer. A poor electrical connection at the mirror or door module. A failed driver door module.

Read the driver mirror feedback voltage on a scan tool. Inspect the driver exterior mirror connector and wiring. Test the mirror feedback circuit for an open. Command the mirror through its range and watch the feedback. Replace the driver exterior mirror if the potentiometer does not track. Clear the code and retest.

B2321

Mirror Driver Horizontal Feedback Potentiometer Circuit Open

System: Body control (B code)
Lamp: Body Warning Light
Category: Body

What it means

B2321 means Mirror Driver Horizontal Feedback Potentiometer Circuit Open.

Check these first

An open in the driver mirror horizontal feedback circuit
A failed driver exterior mirror potentiometer
A poor electrical connection at the mirror or door module
A failed driver door module

What to do next

Read the driver mirror feedback voltage on a scan tool
Inspect the driver exterior mirror connector and wiring
Test the mirror feedback circuit for an open
Command the mirror through its range and watch the feedback
Replace the driver exterior mirror if the potentiometer does not track
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.