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B0851 Cadillac Code - Memory Seat Module Battery Out Of Range

Quick Answer

The B0851 diagnostic trouble code (DTC) indicates that the memory seat module in a Cadillac vehicle is experiencing a battery voltage issue, specifically that the voltage is outside the acceptable range. Common causes include A weak or failing battery that cannot maintain proper voltage, Corroded or loose electrical connections at the memory seat module or battery, A malfunctioning alternator that fails to provide adequate charging voltage. 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 Cadillac indicates Memory Seat Module Battery Out Of Range.
Common causes
Common causes include A weak or failing battery that cannot maintain proper voltage, Corroded or loose electrical connections at the memory seat module or battery, A malfunctioning alternator that fails to provide adequate charging voltage.
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 Oct 23, 2024
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Code B0851 Cadillac Description

The B0851 diagnostic trouble code (DTC) indicates that the memory seat module in a Cadillac vehicle is experiencing a battery voltage issue, specifically that the voltage is outside the acceptable range. This module is responsible for controlling the power seat functions, including memory settings for multiple drivers. When the battery voltage is too low or too high, it can disrupt the module's ability to store and recall seat positions, leading to inconvenience for the driver and passengers.

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

Common Causes of B0851 Cadillac

  1. A weak or failing battery that cannot maintain proper voltage.
  2. Corroded or loose electrical connections at the memory seat module or battery.
  3. A malfunctioning alternator that fails to provide adequate charging voltage.
  4. Faulty memory seat module that has internal issues leading to incorrect voltage readings.
  5. Wiring damage or shorts in the harness connecting the memory seat module to the vehicle's electrical system.

Symptoms of B0851 Cadillac

  1. Inability to set or recall memory seat positions.
  2. Erratic operation of power seat functions (e.g., seat moves unexpectedly).
  3. Warning lights illuminated on the dashboard related to the seat or electrical system.
  4. Other electrical components (windows, mirrors) may also exhibit malfunctioning behavior.
  5. Intermittent loss of power to the memory seat module.

How to Fix B0851 Cadillac

  1. Battery Inspection: Start by testing the vehicle's battery to ensure it is functioning correctly and providing adequate voltage. Replace if necessary.
  2. Check Connections: Inspect all electrical connections related to the memory seat module for corrosion or looseness. Clean or tighten as needed.
  3. Alternator Testing: Test the alternator output to ensure it is charging the battery correctly. Replace if it is not functioning within specifications.
  4. Module Replacement: If the memory seat module is determined to be faulty, it may need to be replaced. Ensure that the new module is programmed to the vehicle's specifications.
  5. Wiring Inspection: Conduct a thorough inspection of the wiring harness for any signs of damage or shorts. Repair or replace damaged wiring as necessary.

Cost to Fix B0851 Cadillac

The cost to repair the B0851 code can vary widely based on the specific issue identified during diagnosis. A rough estimate for battery replacement ranges from $100 to $300, while alternator replacement can cost between $300 and $800. Memory seat module replacement may range from $200 to $600, depending on the part and labor involved. Labor costs typically range from $80 to $150 per hour, depending on location and shop type. In metropolitan areas or dealerships, rates may be higher, while independent shops may offer lower rates. It is advisable to check local rates for a more precise estimate, as specific diagnosis time and labor rates can significantly influence the total repair cost.

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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 B0851 Cadillac Code

1. What does the OBDII code B0851 mean on a Cadillac?

B0851 indicates that the Memory Seat Module (MSM) has detected a battery voltage that is out of the expected range.

2. What are the common symptoms of code B0851 in a Cadillac?

Symptoms may include non-functional memory seat settings, intermittent seat adjustment issues, or failure to save new seat positions.

3. What causes the B0851 code to appear in a Cadillac?

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

4. Can a bad battery trigger code B0851?

Yes, a weak or undercharged battery can cause the voltage to fall out of range, triggering the B0851 code.

5. How do I diagnose the B0851 code on my Cadillac?

Start by checking the battery voltage and connections, inspect the wiring to the Memory Seat Module, and test the MSM for proper functionality.

6. Is it safe to drive with the B0851 code on my Cadillac?

Yes, it is generally safe to drive, but the memory seat functionality may not work properly until the issue is resolved.

7. How do I fix code B0851 on a Cadillac?

Common fixes include charging or replacing the battery, cleaning and securing electrical connections to the MSM, or replacing the Memory Seat Module if faulty.

8. Can a blown fuse cause the B0851 code in a Cadillac?

While unlikely, a blown fuse in the seat adjustment circuit could potentially cause voltage issues leading to the B0851 code.

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

The cost can vary depending on the issue, ranging from $50 for a battery charge or connection repair to $300-$600 if the Memory Seat Module needs replacement.

10. Can I clear the B0851 code without repairing the issue?

You can clear the code with an OBDII scanner, but if the underlying problem isn't resolved, the code will likely return.

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