AutoCodes – GMC – P0800 2014 GMC Sierra

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

Quick Answer

Control modules constantly monitor the vehicle for any condition which may adversely affect vehicle performance. Common causes include Check Active Transfer Case Control Module for codes, Faulty Active Transfer Case Control Module. 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 Check Active Transfer Case Control Module for codes, Faulty Active Transfer Case Control Module.
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.

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Code Popularity 162

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 15, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0800 2014 GMC Sierra Description

Control modules constantly monitor the vehicle for any condition which may adversely affect vehicle performance. If a condition is detected, the module sets a Diagnostic Trouble Code (DTC) and sends a serial data message to the Engine Control Module (ECM). The ECM sets a DTC to inform that the module has set a DTC. The serial data message sent by the module also contains a request for the ECM to illuminate the Malfunction Indicator Lamp (MIL).
The DTC will be set when the ECM receives a serial data message from the Active Transfer Case Control Module indicating that DTC has been set in the module.

OBDII Code P0800 2014 GMC Sierra - Active Transfer Case Control Module Requested MIL Illumination - AutoCodes.com — P0800 2014 GMC Sierra Code - Active Transfer Case Control Module Requested MIL Illumination

What does this mean?

What are the Possible Causes of the DTC P0800 2014 GMC Sierra?

Check Active Transfer Case Control Module for codes
Faulty Active Transfer Case Control Module

How to Fix the DTC P0800 2014 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0800 2014 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0800 2014 GMC Sierra code?

Need more information on how to fix the P0800 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 itâ€™s related to a known bug.

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

Youâ€™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.