Engine-Codes.com
Engine-Codes – GMC – P0800 2016 GMC Sierra

P0800 2016 GMC Sierra Code - Active Transfer Case Control Module Requested MIL Illumination

Quick Answer

The P0800 code for a 2016 GMC Sierra indicates an issue with the Active Transfer Case Control Module Requested MIL Illumination. Common causes include Faulty Active Transfer Case Control Module, Wiring or electrical connection issues, Low transfer case fluid levels or leaks. 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 2016 GMC Sierra indicates Active Transfer Case Control Module Requested MIL Illumination.
Common causes
Common causes include Faulty Active Transfer Case Control Module, Wiring or electrical connection issues, Low transfer case fluid levels or leaks.
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 30, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0800 2016 GMC Sierra Description

The P0800 code for a 2016 GMC Sierra indicates an issue with the Active Transfer Case Control Module Requested MIL Illumination. In simpler terms, this means that the control module responsible for managing the vehicle's transfer case has detected a problem that requires the Malfunction Indicator Lamp (MIL) or Check Engine Light to be illuminated. The transfer case is a crucial component in four-wheel drive and all-wheel drive vehicles, as it allows for power to be distributed between the front and rear axles as needed for optimal traction and performance.

OBDII Code P0800 2016 GMC Sierra - Active Transfer Case Control Module Requested MIL Illumination
P0800 2016 GMC Sierra Code - Active Transfer Case Control Module Requested MIL Illumination

Common Causes of P0800 2016 GMC Sierra

  1. Faulty Active Transfer Case Control Module
  2. Wiring or electrical connection issues
  3. Low transfer case fluid levels or leaks
  4. Mechanical problems within the transfer case
  5. Software or programming issues with the control module

Symptoms of P0800 2016 GMC Sierra

  1. Illumination of the Check Engine Light or Malfunction Indicator Lamp
  2. Difficulty engaging four-wheel drive or all-wheel drive modes
  3. Unusual noises coming from the transfer case area
  4. Reduced traction or stability on slippery surfaces
  5. Transmission shifting issues

How to Fix P0800 2016 GMC Sierra

  1. Begin by using a diagnostic scanner to retrieve the specific trouble codes and data related to the Active Transfer Case Control Module Requested MIL Illumination.
  2. Inspect the wiring and electrical connections leading to the control module for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Check the transfer case fluid level and condition. Top off or replace the fluid if necessary, and inspect for any leaks that may need to be repaired.
  4. Test the transfer case functionality by engaging four-wheel drive or all-wheel drive modes to ensure proper operation. Reset the control module if needed.
  5. If the issue persists, consider replacing the Active Transfer Case Control Module with a new unit to resolve the problem.

Cost to Fix P0800 2016 GMC Sierra

The typical repair costs for addressing a P0800 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing the Active Transfer Case Control Module and addressing any related wiring or fluid issues can range from $500 to $1500, including parts and labor. However, it is important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check with local shops for a more accurate estimate tailored to your specific situation. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

Need more information about the P0800 2016 GMC Sierra code?

Need more information on how to fix the P0800 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0800 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2016 GMC Sierra Code

1. What does the OBDII code P0800 mean on a 2016 GMC Sierra?

P0800 indicates that the Active Transfer Case Control Module has requested the Malfunction Indicator Light (MIL) to illuminate due to a detected issue.

2. What are the common symptoms of a P0800 code in a 2016 GMC Sierra?

Symptoms include the Check Engine Light turning on, issues with shifting into or out of 4WD, and possible drivetrain performance problems.

3. What causes the P0800 code in a 2016 GMC Sierra?

Common causes include a malfunctioning transfer case control module, wiring issues, communication errors between modules, or sensor failures within the transfer case system.

4. Can I drive my 2016 GMC Sierra with a P0800 code?

Driving may be possible, but it is not recommended as it could lead to further damage to the transfer case system or drivetrain.

5. How is the P0800 code diagnosed on a 2016 GMC Sierra?

A mechanic will use a scan tool to check for related codes, inspect the transfer case control module, wiring, and sensors, and perform tests to verify proper operation.

6. How can I fix the P0800 code on my 2016 GMC Sierra?

Repairs may include replacing the transfer case control module, repairing damaged wiring, or reprogramming the module if a software issue is found.

7. Is the P0800 code specific to the transfer case system?

Yes, this code is related to the transfer case control module, which manages the 4WD system in your GMC Sierra.

8. How much does it cost to repair a P0800 code on a 2016 GMC Sierra?

Costs vary but typically range from $100 to $500, depending on whether the issue involves module replacement, wiring repair, or reprogramming.

9. Can a dead battery cause the P0800 code in a 2016 GMC Sierra?

A low or dead battery can sometimes trigger communication errors, potentially leading to this code, but it’s not a common cause.

10. Does the P0800 code always mean the transfer case control module is bad?

No, it could also be caused by wiring issues, sensor failures, or software problems. Proper diagnosis is essential to determine the exact cause.

Discuss the causes and fixes for P0800 2016 GMC Sierra OBDII Code

Submit a New Comment

Code P0800 2016 GMC Sierra comments

No comments found for this page.