Control Module Power Supply Voltage Low
The power supply voltage to the control module is below the acceptable range.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The control module isn't getting enough power to work correctly, usually seen when voltage drops below 7 volts.
What the computer is actually seeing
The control module detects a power supply voltage below 7 volts, resulting in a reduced functionality or a failure to operate properly.
What a healthy reading looks like
Normal power supply voltage should be between 12 and 14 volts with the engine running.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the battery voltage; it should be between 12.4 and 12.7 volts when off, and over 13.5 volts when running. If not, charge or replace the battery.
- 22. Inspect the alternator; check for approximately 14 volts output. If output is low, test or replace the alternator as needed.
- 33. Examine all wiring and connectors to the control module for damage or corrosion. Repair or replace as necessary.
- 44. Verify ground connections to the control module. Clean or repair ground points if resistance is found.
Common causes
- Weak battery
- Faulty alternator
- Bad ground connection
- Wiring issues in the power supply circuit
- Corroded connectors
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It can be, but performance may be compromised, and reliability is uncertain. Address it soon.
Will this code come back after clearing it?
It may, especially if the underlying issue isn't resolved. Expect to troubleshoot further.
Why is this code showing with other codes?
These codes often appear together due to a common power supply issue affecting multiple modules.
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