AutoCodes – GMC – C0870 2018 GMC Sierra

C0870 2018 GMC Sierra Code - Control Module Voltage Reference

Quick Answer

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Common causes include Battery voltage, Faulty Control Module, Control Module harness is open or shorted. 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: C0870 2018 GMC Sierra indicates Control Module Voltage Reference.
Common causes: Common causes include Battery voltage, Faulty Control Module, Control Module harness is open or shorted.
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 213

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 13, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0870 2018 GMC Sierra Description

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Damage to components, and incorrect data can occur when the voltage is out of range. The vehicle has multiple Control Modules that will set this Diagnostic Trouble Code (DTC).

OBDII Code C0870 2018 GMC Sierra - Control Module Voltage Reference - AutoCodes.com — C0870 2018 GMC Sierra Code - Control Module Voltage Reference

What does this mean?

What are the Possible Causes of the DTC C0870 2018 GMC Sierra?

Battery voltage
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC C0870 2018 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 C0870 2018 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 C0870 2018 GMC Sierra code?

Need more information on how to fix the C0870 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0870 2018 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 C0870 2018 GMC Sierra Code

1. What does OBDII code C0870 for a 2018 GMC Sierra indicate?

The code C0870 for a 2018 GMC Sierra refers to a Control Module Voltage Reference fault.

2. What are the common symptoms of OBDII code C0870 in a 2018 GMC Sierra?

Common symptoms of code C0870 in a 2018 GMC Sierra may include issues with the vehicle's electrical system, check engine light illumination, and potential drivability problems.

3. What are the possible causes of OBDII code C0870 in a 2018 GMC Sierra?

Possible causes of code C0870 in a 2018 GMC Sierra include a faulty control module, wiring issues, poor electrical connections, or a malfunctioning voltage regulator.

4. How can I diagnose OBDII code C0870 in my 2018 GMC Sierra?

Diagnosing code C0870 in a 2018 GMC Sierra typically involves using a diagnostic scanner to retrieve the specific fault code, inspecting the control module and related wiring, and testing the voltage reference system.

5. Can I continue driving my 2018 GMC Sierra with OBDII code C0870?

It is not recommended to continue driving your 2018 GMC Sierra with code C0870 present, as it may lead to further electrical system issues or potential drivability problems.

6. How can I repair OBDII code C0870 in my 2018 GMC Sierra?

Repairing code C0870 in a 2018 GMC Sierra may involve replacing the faulty control module, repairing or replacing damaged wiring, ensuring proper electrical connections, or addressing any issues with the voltage regulator.

7. Is it necessary to reset the OBDII code C0870 after repairs in a 2018 GMC Sierra?

Yes, it is recommended to reset the OBDII code C0870 after completing repairs in a 2018 GMC Sierra to clear the fault code and ensure the issue has been resolved.

8. Can a DIY enthusiast fix OBDII code C0870 in a 2018 GMC Sierra?

While some simple checks like inspecting connections can be done by a DIY enthusiast, diagnosing and repairing code C0870 in a 2018 GMC Sierra may require professional diagnostic tools and expertise.

9. Are there any preventive measures to avoid OBDII code C0870 in a 2018 GMC Sierra?

Regular vehicle maintenance, including checking the electrical system components and addressing any issues promptly, can help prevent OBDII code C0870 in a 2018 GMC Sierra.

10. How long does it typically take to repair OBDII code C0870 in a 2018 GMC Sierra?

The time required to repair code C0870 in a 2018 GMC Sierra can vary depending on the specific issue, but it may take several hours to diagnose and fix the underlying cause.