AutoCodes – Chevrolet – P0800 Chevrolet

P0800 Chevrolet 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 Chevrolet 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 1,179

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 Chevrolet 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 Chevrolet - Active Transfer Case Control Module Requested MIL Illumination - AutoCodes.com — P0800 Chevrolet Code - Active Transfer Case Control Module Requested MIL Illumination

What does this mean?

What are the Possible Causes of the DTC P0800 Chevrolet?

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

How to Fix the DTC P0800 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the P0800 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P0800 2014 Chevrolet Silverado — Active Transfer Case Control Module Requested MIL Illumination
P0800 2015 Chevrolet Silverado — Active Transfer Case Control Module Requested MIL Illumination
P0800 2016 Chevrolet Silverado — Active Transfer Case Control Module Requested MIL Illumination
P0800 2017 Chevrolet Silverado — Active Transfer Case Control Module Requested MIL Illumination
P0800 2018 Chevrolet Silverado — Active Transfer Case Control Module Requested MIL Illumination

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 Chevrolet Code

1. What does the OBDII code P0800 mean for a Chevrolet?

The P0800 code indicates that the Active Transfer Case Control Module has requested the Malfunction Indicator Lamp (MIL) to illuminate due to detecting an issue.

2. What are the common symptoms of code P0800 in a Chevrolet?

Common symptoms include the check engine light turning on, the 4WD system malfunctioning or failing to engage, and unusual noises or vibrations from the transfer case.

3. What causes the P0800 code to appear on a Chevrolet?

This code is often caused by a fault in the transfer case control module, electrical issues like damaged wiring or poor connections, or internal transfer case mechanical problems.

4. Can I drive my Chevrolet with the P0800 code?

While you may still be able to drive, the 4WD system may not function properly, and continued driving could potentially cause further damage. It's best to address the issue promptly.

5. How do I diagnose the P0800 code on my Chevrolet?

Diagnosing involves using an OBDII scanner to confirm the code, inspecting the transfer case control module, wiring, and connectors, and testing the functionality of the 4WD system.

6. How can I fix the P0800 code on a Chevrolet?

Repairs may include replacing or reprogramming the transfer case control module, repairing damaged wiring, or addressing any mechanical issues within the transfer case.

7. Does the P0800 code require reprogramming the Transfer Case Control Module?

In some cases, reprogramming or updating the module's software may be required, especially if the issue is related to outdated firmware.

8. How much does it cost to repair the P0800 code on a Chevrolet?

Repair costs vary depending on the specific issue but can range from $150 to $800, including diagnostics, module replacement, or transfer case repairs.

9. Can a software update fix the P0800 code on a Chevrolet?

Yes, if the issue is related to outdated software in the transfer case control module, a software update may resolve the problem.

10. What tools are needed to diagnose the P0800 code?

You'll need an OBDII scanner capable of reading manufacturer-specific codes, a multimeter to test wiring, and potentially specialized tools for working on the transfer case.