Brake System Control Module Power Supply Circuit Low Voltage
Low voltage detected in the brake system control module power supply.
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 brake system control module isn't getting enough power to work properly, possibly due to wiring issues or a weak battery.
What the computer is actually seeing
The control module sees voltage below 9 volts on its power supply circuit when it should be between 10-16 volts during normal operation.
What a healthy reading looks like
Power supply voltage should be between 10 to 16 volts.
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 to 12.7 volts (engine off) and between 13.7 to 14.7 volts (engine running). If low, recharge or replace the battery.
- 22. Inspect battery terminals and cables for corrosion or loose connections. Clean and tighten as necessary.
- 33. Check the wiring harness leading to the brake system control module for fraying, shorts, or disconnections. Repair or replace as needed.
- 44. With the ignition on, check the voltage at the brake system control module power supply pin. If below 10 volts, further inspect the circuit back to the battery for issues.
- 55. If all wiring checks out and voltage is still low, test the brake system control module itself for faults.
Common causes
- Bad battery connection
- Weak or dead battery
- Corroded or damaged wiring
- Faulty brake system control module
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive as it may affect braking performance.
Will this code come back after erasing?
If the underlying issue isn't fixed, the code will likely return.
Why does this relate to brakes?
The brake system control module is crucial for controlling braking systems, including stability and anti-lock functions.
Working a real vehicle right now?
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