AutoCodes – Generic – B0851

B0851 Code - Memory Seat Module Battery Out Of Range

Quick Answer

The Memory Seat Module has two battery voltage supply circuits. Common causes include Faulty Memory Seat Module, Memory Seat Module harness is open or shorted, Memory Seat Module circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0851 indicates Memory Seat Module Battery Out Of Range.
Common causes: Common causes include Faulty Memory Seat Module, Memory Seat Module harness is open or shorted, Memory Seat Module circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 1,839

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 18, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0851 Description

The Memory Seat Module has two battery voltage supply circuits. The battery 1 voltage supply circuit is used to provide power for the memory seat module logic and internal driver operation. The battery 2 voltage supply circuit is used to provide a high current supply for the memory seat module output devices.

OBDII Code B0851 - Memory Seat Module Battery Out Of Range - AutoCodes.com — B0851 Code - Memory Seat Module Battery Out Of Range

What does this mean?

What are the Possible Causes of the DTC B0851?

Faulty Memory Seat Module
Memory Seat Module harness is open or shorted
Memory Seat Module circuit poor electrical connection

How to Fix the DTC B0851?

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 B0851 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.

Need more information about the B0851 code?

Need more information on how to fix the B0851 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0851 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0851 Buick — Memory Seat Module Battery Out Of Range
B0851 Cadillac — Memory Seat Module Battery Out Of Range
B0851 Chevrolet — Memory Seat Module Battery Out Of Range
B0851 GMC — Memory Seat Module Battery Out Of Range

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 B0851 Code

1. What does the OBDII code B0851 mean?

The code B0851 indicates that the Memory Seat Module (MSM) is reporting a battery voltage level that is out of the expected range.

2. What are the common symptoms of the B0851 code?

Symptoms may include non-responsive memory seat functions, erratic seat adjustments, or the memory settings not being saved.

3. What causes the B0851 code to appear?

The most common causes are a weak or failing vehicle battery, poor electrical connections to the Memory Seat Module, or a faulty MSM.

4. How can I diagnose the B0851 code?

Start by inspecting the battery voltage, checking the wiring and connectors to the Memory Seat Module, and testing the MSM for proper functionality.

5. Will the B0851 code affect other vehicle systems?

It typically only affects the memory seat system, but in rare cases, it could interfere with other comfort features tied to the MSM.

6. Can a weak vehicle battery trigger the B0851 code?

Yes, a weak or low-voltage battery can cause the Memory Seat Module to detect an out-of-range voltage.

7. How do I fix the B0851 code?

Repairs may include charging or replacing the vehicle battery, cleaning and securing the MSM connections, or replacing the Memory Seat Module if itâ€™s faulty.

8. Is the B0851 code safe to ignore?

While it wonâ€™t typically cause a safety issue, ignoring the code may lead to loss of memory seat functionality and possible inconvenience.

9. How much does it cost to repair the B0851 code?

The cost depends on the root cause, ranging from $50â€“$150 for a battery or wiring repair to $200â€“$500 for a replacement Memory Seat Module.

10. Can the B0851 code clear itself?

If the underlying issue resolves, such as restoring proper battery voltage, the code may clear itself after a number of drive cycles. Otherwise, it will need to be cleared with a scan tool.