AutoCodes – Mercury – B2320 Mercury

B2320 Mercury Code - Mirror Driver Horizontal Feedback Potentiometer Circuit Failure

Quick Answer

Under normal operation, the exterior mirror control switch receives power and ground from the circuit. Common causes include Faulty Driver Exterior Mirror, Driver Exterior Mirror harness is open or shorted, Driver Exterior Mirror circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B2320 Mercury indicates Mirror Driver Horizontal Feedback Potentiometer Circuit Failure.
Common causes: Common causes include Faulty Driver Exterior Mirror, Driver Exterior Mirror harness is open or shorted, Driver Exterior Mirror circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 551

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 07, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2320 Mercury Description

Under normal operation, the exterior mirror control switch receives power and ground from the circuit. The exterior mirror control switch uses circuits to send input signals to the Driver Door Module (DDM). The DDM controls the Left (LH) exterior mirror motor movement by supplying the appropriate power and ground to circuits. The DDM communicates with the Driver Seat Module (DSM) through the Medium-Speed Controller Area Network (MS-CAN) whenever the DDM receives an input signal from the exterior mirror control switch for the Right (RH) mirror. The DSM controls the RH exterior mirror motor movement by supplying the appropriate power and ground.
The memory mirror system uses feedback potentiometers, located in the LH and RH exterior mirrors, in order to track the movement of the LH and RH exterior mirror motors. The DDM supplies the LH and RH exterior mirror feedback potentiometer reference voltage and ground through circuits. The DDM receives feedback from the LH and RH exterior mirror feedback potentiometer through left/right and up/down circuits.

OBDII Code B2320 Mercury - Mirror Driver Horizontal Feedback Potentiometer Circuit Failure - AutoCodes.com — B2320 Mercury Code - Mirror Driver Horizontal Feedback Potentiometer Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B2320 Mercury?

Faulty Driver Exterior Mirror
Driver Exterior Mirror harness is open or shorted
Driver Exterior Mirror circuit poor electrical connection
Faulty Driver Exterior Mirror Control Switch
Faulty Driver Door Module (DDM)
Faulty Driver Seat Module (DSM)

How to Fix the DTC B2320 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2320 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B2320 Mercury Code

1. What does OBDII code B2320 mean on a Mercury vehicle?

Code B2320 indicates a failure in the Mirror Driver Horizontal Feedback Potentiometer Circuit, which monitors the horizontal movement of the side mirrors.

2. What are the symptoms of code B2320 in a Mercury?

Symptoms may include unresponsive or malfunctioning power mirrors, difficulty adjusting the mirror horizontally, or an illuminated warning light.

3. What causes the B2320 code to appear?

Common causes include a faulty mirror motor, damaged wiring or connectors in the mirror circuit, or a malfunctioning potentiometer.

4. Can I still drive my Mercury with the B2320 code active?

Yes, the issue is not critical for driving, but it may affect the convenience and functionality of your power mirrors.

5. How do I diagnose the B2320 code?

Start by inspecting the mirror wiring and connectors for damage, checking the potentiometer for proper operation, and testing the mirror motor.

6. How do I fix the B2320 code on a Mercury?

Repairs may involve replacing the mirror motor, repairing damaged wiring, or replacing the faulty potentiometer.

7. Can a blown fuse cause the B2320 code?

Yes, a blown fuse in the mirror circuit can interrupt power and potentially trigger the code, so checking fuses is a good first step.

8. How much does it cost to fix the B2320 code?

Repair costs can vary, but replacing a mirror motor or potentiometer typically costs between $100 and $300, depending on labor and parts.

9. Can a software update resolve the B2320 code?

Itâ€™s unlikely, as the issue is typically hardware-related, but itâ€™s worth checking for any technical service bulletins (TSBs) specific to your Mercury model.

10. Do I need professional help to fix the B2320 code?

While some repairs, like checking fuses or connectors, can be done at home, diagnosing and replacing components like the mirror motor may require professional assistance.