Invalid Data Received from Brake Control Module
The brake control module is relaying inconsistent information.
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What it means (plain English)
Inside the vehicle's computer system, the brake control module sends data about brake pressure. If that data doesn't match expected patterns (like pressure readings suddenly dropping to 0 or back to normal), the engine control unit (ECU) throws a fit and logs this code.
What the computer is actually seeing
The ECU sees erroneous data coming from the brake control module, indicating potential faults in communication or sensor errors between 0 and 5 volts where brake pressure levels should be consistent and proportional to driver input.
What a healthy reading looks like
Brake pressure should typically be between 0 and 3000 psi, and the signal voltage from the module should reflect those pressures accurately (0-5 volts). Any voltage significantly outside of this range indicates a fault.
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. Inspect the wiring and connectors for the brake control module and the pressure sensor. Look for frayed wires or corrosion. Fix any issues found.
- 22. Check the brake pressure sensor output. Use a multimeter to ensure the voltage is within 0-5 volts while applying brake pressure. If the output is out of range, replace the sensor.
- 33. Verify the functionality of the brake control module. If wiring and the sensor are good, check the module's operation according to manufacturer specifications.
Common causes
- Faulty brake control module
- Wiring issues (shorts or opens)
- Poor connections or corrosion at connectors
- Faulty brake pressure sensor
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's best to avoid driving until the issue is resolved, as brake functionality may be compromised.
Will the fault code come back after clearing it?
If the underlying issue isn't fixed, the code will likely return.
Why does this code often pair with SPN 741?
They both relate to the brake control module, and issues in that system can often trigger multiple related fault codes.
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