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P0800 2017 GMC Sierra Code - Active Transfer Case Control Module Requested MIL Illumination

Quick Answer

The P0800 code for a 2017 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 electrical faults in the system, Sensor malfunction or failure. 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 2017 GMC Sierra indicates Active Transfer Case Control Module Requested MIL Illumination.
Common causes
Common causes include Faulty transfer case control module, Wiring issues or electrical faults in the system, Sensor malfunction or failure.
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 13, 2024
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Code P0800 2017 GMC Sierra Description

The P0800 code for a 2017 GMC Sierra indicates that the Active Transfer Case Control Module has requested the Malfunction Indicator Lamp (MIL) to illuminate. This means that there is a fault or issue detected in the transfer case control system, which manages the distribution of power between the front and rear wheels in a four-wheel-drive vehicle. The transfer case control module plays a crucial role in ensuring proper operation of the transfer case, which is essential for optimal traction and performance, especially in off-road or slippery road conditions.

OBDII Code P0800 2017 GMC Sierra - Active Transfer Case Control Module Requested MIL Illumination
P0800 2017 GMC Sierra Code - Active Transfer Case Control Module Requested MIL Illumination

Common Causes of P0800 2017 GMC Sierra

  1. Faulty transfer case control module
  2. Wiring issues or electrical faults in the system
  3. Sensor malfunction or failure
  4. Mechanical problems within the transfer case
  5. Corrosion or damage to connectors in the system

Symptoms of P0800 2017 GMC Sierra

  1. Illumination of the Malfunction Indicator Lamp (MIL) on the dashboard
  2. Difficulty engaging or disengaging four-wheel-drive mode
  3. Unusual noises coming from the transfer case area
  4. Reduced traction or stability while driving in challenging conditions
  5. Dashboard warning messages related to the transfer case system

How to Fix P0800 2017 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 and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the transfer case control module and sensors for proper functionality. Replace any components that are found to be faulty.
  4. Clear the trouble codes from the system and perform a test drive to ensure that the issue has been resolved.
  5. If the problem persists, further diagnosis may be necessary to pinpoint the exact cause of the fault.

Cost to Fix P0800 2017 GMC Sierra

The typical repair costs for addressing a P0800 code in a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, parts and labor for this type of repair could range from $200 to $800 or more. It's important to note that diagnostic time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates typically range from $80 to $150 per hour, with rates potentially higher at dealerships or in metropolitan areas, and lower at independent shops. For a more accurate estimate, it's advisable to consult with a local auto repair shop.

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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 2017 GMC Sierra Code

1. What does the OBDII code P0800 mean on a 2017 GMC Sierra?

P0800 indicates that the Active Transfer Case Control Module has requested the Malfunction Indicator Lamp (MIL) to illuminate, typically due to a fault in the transfer case or related systems.

2. What are the common symptoms of the P0800 code in a 2017 GMC Sierra?

Common symptoms include the check engine light being illuminated, issues with 4WD engagement, unusual noises from the transfer case, or the inability to switch between 2WD and 4WD modes.

3. What causes the P0800 code to appear on a 2017 GMC Sierra?

The code can be triggered by a faulty transfer case control module, damaged wiring or connectors, low or contaminated transfer case fluid, or a malfunctioning shift motor.

4. Can the P0800 code affect drivability in a 2017 GMC Sierra?

Yes, it can impact drivability if the vehicle is unable to properly engage or disengage 4WD, potentially leading to handling issues or reduced performance.

5. How is the P0800 code diagnosed in a 2017 GMC Sierra?

Diagnosis involves scanning for trouble codes, inspecting wiring and connectors for damage, testing the transfer case control module and shift motor, and checking the condition and level of the transfer case fluid.

6. Can I still drive my 2017 GMC Sierra with the P0800 code?

While it may be drivable, continued use without addressing the issue can lead to further damage to the transfer case system and compromise vehicle performance.

7. What repairs are typically needed to fix the P0800 code in a 2017 GMC Sierra?

Repairs may include replacing the transfer case control module, repairing or replacing damaged wiring, servicing the transfer case fluid, or replacing the transfer case shift motor.

8. How much does it cost to fix the P0800 code on a 2017 GMC Sierra?

Repair costs can vary widely, ranging from $100 for simple wiring repairs to $1,000 or more for transfer case module or shift motor replacements, depending on parts and labor.

9. Can a software update fix the P0800 code on a 2017 GMC Sierra?

In some cases, a software update for the transfer case control module may resolve the issue if the problem is related to a programming error.

10. How can I prevent the P0800 code from returning on my 2017 GMC Sierra?

Regular maintenance of the transfer case, including fluid checks and timely repairs of any 4WD system issues, can help prevent the P0800 code from recurring.

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