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Engine-Codes – GMC – P0800 2014 GMC Sierra

P0800 2014 GMC Sierra Code - Active Transfer Case Control Module Requested MIL Illumination

Quick Answer

The P0800 code for a 2014 GMC Sierra indicates that the Active Transfer Case Control Module has requested the Malfunction Indicator Lamp (MIL) to illuminate. Common causes include Faulty transfer case control module, Wiring issues or damaged wiring harness, Sensor malfunction. 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
P0800 2014 GMC Sierra indicates Active Transfer Case Control Module Requested MIL Illumination.
Common causes
Common causes include Faulty transfer case control module, Wiring issues or damaged wiring harness, Sensor malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P0800 2014 GMC Sierra Description

The P0800 code for a 2014 GMC Sierra indicates that the Active Transfer Case Control Module has requested the Malfunction Indicator Lamp (MIL) to illuminate. The transfer case control module is responsible for managing the vehicle's transfer case, which controls the distribution of power between the front and rear wheels. When this code is triggered, it means that the module has detected a fault or issue that requires attention.

OBDII Code P0800 2014 GMC Sierra - Active Transfer Case Control Module Requested MIL Illumination
P0800 2014 GMC Sierra Code - Active Transfer Case Control Module Requested MIL Illumination

Common Causes of P0800 2014 GMC Sierra

  1. Faulty transfer case control module
  2. Wiring issues or damaged wiring harness
  3. Sensor malfunction
  4. Communication errors between the module and other vehicle systems
  5. Corrosion or water damage in the transfer case system

Symptoms of P0800 2014 GMC Sierra

  1. Difficulty shifting between 2-wheel drive and 4-wheel drive modes
  2. Stuck in one mode (2-wheel drive or 4-wheel drive)
  3. Illumination of the Service 4WD light on the dashboard
  4. Unusual noises coming from the transfer case area

How to Fix P0800 2014 GMC Sierra

  1. Begin by using a diagnostic scanner to retrieve the specific trouble codes and data related to the transfer case control module.
  2. Inspect the wiring harness and connectors for any signs of damage or corrosion. Repair or replace as needed.
  3. Test the sensors in the transfer case system to ensure they are functioning correctly. Replace any faulty sensors.
  4. Check for any communication errors between the module and other vehicle systems. Reset or reprogram the module as necessary.
  5. Clear the trouble codes and perform a test drive to verify that the issue has been resolved.

Cost to Fix P0800 2014 GMC Sierra

The typical repair costs for addressing a P0800 code on a 2014 GMC Sierra can range from $200 to $600, depending on the specific cause of the issue and the parts needed for repair. This estimate includes parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops often charge less.

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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 P0800 2014 GMC Sierra Code

1. What does the OBDII code P0800 mean on a 2014 GMC Sierra?

P0800 indicates that the Active Transfer Case Control Module has requested the Malfunction Indicator Lamp (MIL) to illuminate due to a detected issue in the transfer case system.

2. What are common symptoms of the P0800 code in a 2014 GMC Sierra?

Common symptoms include the Check Engine Light turning on, issues with shifting between 2WD and 4WD modes, unusual noises from the transfer case, or the 4WD system not engaging properly.

3. What causes the P0800 code in a 2014 GMC Sierra?

Possible causes include a malfunctioning transfer case control module, electrical wiring issues, a failing transfer case motor, or incorrect signals from related sensors.

4. How do I diagnose the P0800 code on my 2014 GMC Sierra?

Start by scanning for trouble codes, inspecting transfer case wiring and connectors for damage, testing the transfer case motor, and checking for software updates for the control module.

5. Can I drive my 2014 GMC Sierra with the P0800 code?

It is possible to drive the vehicle, but 4WD functionality may be compromised, which could impact performance in off-road or slippery conditions. Prompt diagnosis and repair are recommended.

6. How do I fix the P0800 code on a 2014 GMC Sierra?

Repairs may include replacing the transfer case control module, repairing or replacing damaged wiring, recalibrating the transfer case system, or replacing the transfer case motor.

7. How much does it cost to repair the P0800 code on a 2014 GMC Sierra?

Repair costs depend on the exact issue, but replacing the transfer case control module can range from $300 to $600, while wiring repairs or sensor replacements may cost less.

8. Can a software update fix the P0800 code on my 2014 GMC Sierra?

Yes, in some cases, reprogramming or updating the software of the transfer case control module may resolve the issue, especially if it’s related to a known bug.

9. What tools are needed to troubleshoot the P0800 code?

You’ll need a diagnostic scanner to read and clear codes, a multimeter to check wiring and connections, and possibly a transfer case system calibration tool.

10. Does the P0800 code always indicate a serious problem?

Not necessarily. While it can point to a serious issue with the transfer case system, it may also result from minor problems like a loose connection or a temporary glitch.

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