C0800ABS / Electrical

Control Module Device Power / Battery Voltage Circuit

C0800 indicates the control module (often the ABS/EBCM) has detected a device power supply or battery voltage problem. Voltage is out of the acceptable range, which can set false ABS faults and disable the system.

🚗 Yes, but check the battery and charging system, as low or unstable voltage can disable ABS.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Weak battery$120-$300

35%

An old or failing battery causes low or unstable voltage.

#2Charging system fault$150-$600

25%

A failing alternator or belt causes voltage swings.

#3Poor power or ground connection$20-$250

25%

Corroded terminals or grounds cause voltage drops.

#4Module wiring fault$50-$300

15%

Damaged power feed wiring to the control module.

🩺 Common Symptoms

ABS and other warning lights on
Dimming or flickering lights
Multiple electrical codes stored
Hard starting or dead battery

💰 Repair Cost: DIY vs Shop

DIY Cost

$20-$300

Shop Cost

$100-$600

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose C0800

1Load-test the battery and check its state of charge

2Test alternator output and voltage at idle and load

3Clean and tighten battery terminals and ground straps

4Check the module power feed and grounds

❓ Frequently Asked Questions

Can I drive with C0800?

Yes, but the underlying voltage issue can disable ABS and leave you stranded, so test the battery and charging system soon.

How much to fix C0800?

Often just a battery or ground repair, from about $20 up to a few hundred for a charging fault.

What causes C0800 most often?

A weak battery, a charging system fault, or corroded power and ground connections.

🔗 Related Codes

C0561C0121C0110C0710