AutoCodes – Generic – C0870

C0870 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 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 4,156

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 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 - Control Module Voltage Reference - AutoCodes.com — C0870 Code - Control Module Voltage Reference

What does this mean?

What are the Possible Causes of the DTC C0870?

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

How to Fix the DTC C0870?

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 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 code?

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

Need Help with the Code?

Get the C0870 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0870 Buick — Control Module Voltage Reference
C0870 Cadillac — Control Module Voltage Reference
C0870 Chevrolet — Control Module Voltage Reference
C0870 Gmc — Control Module Voltage Reference
C0870 Pontiac — Control Module Voltage Reference
C0870 Saturn — Control Module Voltage Reference

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 Code

1. What are the common symptoms of OBDII code C0870 related to Control Module Voltage Reference?

- Common symptoms include erratic engine performance, issues with the vehicle's transmission, and potential illumination of the Check Engine Light.

2. What are the possible causes of OBDII code C0870?

- Possible causes of this code include a faulty control module, damaged wiring or connectors in the voltage reference circuit, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the root cause of OBDII code C0870?

- Diagnosing this code typically involves using a diagnostic scan tool to read the specific error codes, checking the voltage reference signal, inspecting the wiring and connectors, and testing the control module's functionality.

4. Can I drive my vehicle with OBDII code C0870?

- It is generally not recommended to drive the vehicle with this code present, as it can lead to further damage and potential safety risks. It's best to address the issue promptly.

5. What are some repair tips for fixing OBDII code C0870?

- Repair tips may include checking and repairing any damaged wiring or connectors, replacing the faulty control module or PCM, and ensuring all connections are secure and functioning properly.

6. How much does it cost to repair OBDII code C0870?

- The cost of repairing this code can vary depending on the specific issue causing it, the make and model of the vehicle, and labor rates in your area. It's best to consult with a qualified mechanic for an accurate estimate.

7. Can I reset OBDII code C0870 without fixing the underlying issue?

- While you can clear the error code temporarily, it is not recommended to reset the code without addressing the root cause. The issue will likely resurface, potentially causing more severe problems.

8. Is OBDII code C0870 a common problem in certain vehicle models?

- This code may be more prevalent in specific vehicle models known for control module or wiring issues. Checking online forums or consulting with a dealership can provide insight into common occurrences.

9. Are there any preventative measures to avoid OBDII code C0870 in the future?

- Regular maintenance, including checking the vehicle's electrical system, keeping wiring connections secure, and addressing any warning signs promptly, can help prevent issues leading to this code.

10. Can a DIY enthusiast fix OBDII code C0870, or is it best left to professionals?

- While some experienced DIY enthusiasts may be able to diagnose and repair this code, it is often best to consult with a professional mechanic or technician for accurate diagnosis and safe repairs.