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Engine-Codes – Generic – B0851

B0851 Code - Memory Seat Module Battery Out Of Range

Quick Answer

The B0851 diagnostic trouble code indicates that the memory seat module battery is out of range. Common causes include Faulty battery within the memory seat module, Wiring issues or loose connections, Corrosion on the battery terminals. 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 battery within the memory seat module, Wiring issues or loose connections, Corrosion on the battery terminals.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code B0851 Description

The B0851 diagnostic trouble code indicates that the memory seat module battery is out of range. The memory seat module is responsible for storing and recalling the seat position settings for the driver. When the battery within the module is out of range, it means that the voltage level is either too high or too low, which can prevent the module from functioning properly. This can lead to issues with adjusting the seat position, memory settings not being saved, or the seat not moving at all.

OBDII Code B0851 - Memory Seat Module Battery Out Of Range
B0851 Code - Memory Seat Module Battery Out Of Range

Common Causes of B0851

  1. Faulty battery within the memory seat module.
  2. Wiring issues or loose connections.
  3. Corrosion on the battery terminals.
  4. Electrical system problems within the vehicle.
  5. Overcharging or undercharging of the battery.

Symptoms of B0851

  1. Inability to adjust the seat position.
  2. Memory seat settings not being saved.
  3. Seat moving unexpectedly or erratically.
  4. Warning light on the dashboard related to the memory seat system.
  5. Unusual noises coming from the seat when attempting to adjust it.

How to Fix B0851

  1. Begin by checking the battery within the memory seat module and replacing it if necessary.
  2. Inspect the wiring and connections for any damage or corrosion, repairing or replacing as needed.
  3. Test the voltage levels in the memory seat module to ensure they are within the acceptable range.
  4. Reset the memory seat module to clear any stored error codes and recalibrate the system.
  5. If the issue persists, consult a professional technician to diagnose any underlying electrical problems within the vehicle.

Cost to Fix B0851

The typical repair costs for addressing a memory seat module battery out of range issue can range from $100 to $300, depending on the extent of the problem and the cost of parts and labor. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate. Additionally, factors such as the vehicle make and model, as well as the location of the repair shop, can also impact the final cost of the repair.

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Code B0851 Information for Specific Makes

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 it’s faulty.

8. Is the B0851 code safe to ignore?

While it won’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 $50–$150 for a battery or wiring repair to $200–$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.

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