Lost Communication With Anti-lock Brake System (ABS) Control Module
The vehicle's computer can't talk to the ABS 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)
The car's main computer expects to receive data from the ABS module to manage braking effectively, but it's not getting any. This could lead to reduced braking performance or safety issues.
What the computer is actually seeing
Control module communication error signals that the ABS control module is not responding, usually indicated by a voltage signal that is either missing or outside the expected range.
What a healthy reading looks like
Expected voltage signal from the ABS module should be around 0.5 to 5.0 volts. If the module is not communicating, the voltage may read 0 or stay fixed above those values without varying.
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 for any blown fuses related to the ABS system. If a fuse is blown, replace it and recheck for the code.
- 22. Inspect the wiring and connectors between the PCM and ABS module. Look for frayed wires or corrosion, and repair as necessary.
- 33. Use a scan tool to check live data from the ABS module. If it's unresponsive, move to the next step.
- 44. Test the power and ground circuits to the ABS module using a multimeter; power should be present (typically 12V) and the ground should be solid without resistance.
- 55. If power and ground are good, then the ABS module may need replacement.
Common causes
- Wiring issue between the PCM and ABS module
- Corroded or damaged connectors
- Faulty ABS control module
- Blown fuse for ABS power supply
- Software compatibility issues between modules
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive until the issue is fixed; braking performance could be compromised.
Will this code come back?
Yes, if the underlying issue is not resolved, the code will likely reappear.
Why does this code pair with others?
Multiple communication issues might indicate a broader electrical problem, affecting several modules.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →