AutoCodes – Generic – C0800:03

C0800:03 Code - Control Module Power Circuit Low Voltage

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: C0800:03 indicates Control Module Power Circuit Low Voltage.
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 3,098

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 Sep 23, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0800:03 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 C0800:03 - Control Module Power Circuit Low Voltage - AutoCodes.com — C0800:03 Code - Control Module Power Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC C0800:03?

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

How to Fix the DTC C0800:03?

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 C0800:03 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.

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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 C0800:03 Code

1. What does OBDII code C0800:03 mean?

C0800:03 indicates a low voltage issue in the control module power circuit, which may affect communication with various vehicle systems.

2. What are the common symptoms of code C0800:03?

Symptoms may include warning lights on the dashboard, erratic electrical system behavior, or failure in communication between control modules.

3. What causes the C0800:03 code to appear?

Common causes include a weak or failing battery, loose or corroded electrical connections, faulty power supply wiring, or issues with the control module itself.

4. Can a bad alternator trigger code C0800:03?

Yes, a failing alternator that isn’t properly charging the battery can cause low voltage issues and trigger this code.

5. How do you diagnose code C0800:03?

Diagnose by checking the battery voltage, inspecting wiring and connections for damage or corrosion, and testing the alternator and control module function.

6. How can I fix code C0800:03?

Repairs may include replacing the battery, fixing damaged wiring, cleaning electrical connections, or replacing the control module if faulty.

7. Can driving with code C0800:03 cause further damage?

Yes, prolonged driving with low voltage can strain electrical components and potentially lead to additional system failures.

8. Is code C0800:03 limited to specific vehicle makes or models?

No, this code can appear in any vehicle equipped with OBDII systems, though the exact repair steps may vary by manufacturer.

9. Will clearing the C0800:03 code fix the problem?

No, clearing the code does not resolve the underlying issue; repairs must be made to address the low voltage condition.

10. How much does it cost to repair code C0800:03?

Repair costs vary depending on the underlying cause, ranging from minor fixes like cleaning connections to more expensive repairs like replacing a control module.