Brake Control Module Supply Voltage
This code indicates a supply voltage issue with the brake control module.
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)
Inside the vehicle's brake control module, there's supposed to be a steady power supply, usually around 12 to 14 volts. If the module gets less voltage than that, it throws this code to alert you there's a problem.
What the computer is actually seeing
The brake control module monitors its own supply voltage and looks for a stable range typically between 12.0V and 14.5V. If the voltage falls below about 10.5V, it'll set this code and may stop functioning.
What a healthy reading looks like
Expected supply voltage should be between 12.0 - 14.5 volts when the engine is running and the electrical systems are normal.
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.
- 1Check the battery voltage. It should be between 12.0V and 14.5V. If it's low, charge or replace the battery before proceeding.
- 2Inspect the wiring and connectors to the brake control module for damage or corrosion. Repair any issues found.
- 3With the vehicle running, use a multimeter to check the supply voltage at the brake control module connector. Compare your reading against expected values (12.0V - 14.5V). If it's low, investigate further for high resistance or poor connections.
- 4If voltage is within range but the code persists, consider testing the brake control module for faults. Follow the manufacturer’s diagnostics for specific tests.
Common causes
- Faulty wiring or connectors to the brake control module
- Weak or faulty battery
- Voltage drops due to high resistance in connections or circuits
- Faulty brake control module
- Bad ground connection
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's generally safe if the brakes function properly, but you should fix it soon to avoid brake system failure.
Will this code come back after clearing it?
It might, especially if the underlying issue isn't fixed. Make sure to address all the potential causes.
Why does this code sometimes pair with other codes?
Multiple codes can indicate a common problem, such as electrical issues affecting more than one module.
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