AutoCodes – Generic – C0800

C0800 Code - Control Module Power Circuit

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 Faulty Control Module Power, Control Module Power harness is open or shorted, Control Module Power circuit poor electrical connection. 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: C0800 indicates Control Module Power Circuit.
Common causes: Common causes include Faulty Control Module Power, Control Module Power harness is open or shorted, Control Module Power circuit poor electrical connection.
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 44,944

How popular is this code, among other codes? Medium

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 Sep 23, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C0800 Description

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. The Powertrain Control Module (PCM) sets the OBDII code when the system voltage is not to factory specifications. The following control modules will set this Diagnostic Trouble Code (DTC): Body Control Module (BCM), Instrument Panel Cluster (IPC), Radio and Sensing and Diagnostic Module (SDM).

OBDII Code C0800 - Control Module Power Circuit - AutoCodes.com — C0800 Code - Control Module Power Circuit

What does this mean?

What are the Possible Causes of the DTC C0800?

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

How to Fix the DTC C0800?

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 does this mean?

Code Tech Notes

- C0800:03 Control Module Power Circuit Low Voltage
- C0800:07 Control Module Power Circuit High Voltage
- C0800:0D Control Module Power Circuit High Resistance
- C0800:11 Control Module Power Circuit High Input

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0800 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 C0800 code?

Need more information on how to fix the C0800 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0800 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0800 Buick — Control Module Power Circuit
C0800 Cadillac — Control Module Power Circuit
C0800 Chevrolet — Control Module Power Circuit
C0800 GMC — Control Module Power Circuit
C0800 Saturn — Control Module Power Circuit

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 C0800 Code

1. What does the OBDII code C0800 mean?

The C0800 code indicates a problem with the control module power circuit, often related to insufficient or interrupted power supply to the module.

2. What are the common symptoms of a C0800 code?

Symptoms may include warning lights on the dashboard, erratic vehicle behavior, or failure of certain electrical systems to function properly.

3. What causes the C0800 code to be triggered?

The code can be caused by a weak or faulty battery, poor ground connections, damaged wiring, or a failing power control module.

4. Can a bad alternator cause the C0800 code?

Yes, a malfunctioning alternator that cannot maintain proper voltage levels can trigger the C0800 code.

5. How do I diagnose a C0800 code?

Use a multimeter to check the battery voltage, inspect wiring and connectors for damage or corrosion, and test the ground connections and power supply to the control module.

6. Can I drive with a C0800 code?

While the vehicle may still be drivable, ignoring the code can lead to further electrical issues or damage to the control module.

7. How do I fix the C0800 code?

Repairs may include replacing a weak battery, repairing damaged wiring, cleaning corroded connectors, or replacing the control module if it is defective.

8. Can clearing the C0800 code solve the issue?

Clearing the code may temporarily turn off the warning light, but the underlying issue must be repaired to prevent the code from returning.

9. How much does it cost to repair a C0800 code?

The cost depends on the root cause, ranging from a simple battery replacement ($100-$200) to more extensive repairs like module replacement, which can cost several hundred dollars.

10. What tools are needed to troubleshoot the C0800 code?

Youâ€™ll need an OBDII scanner, a multimeter, and basic tools for inspecting and repairing wiring and connectors.