AEB (Active Emergency Braking) System Operational Status Fault
The AEB system has detected a fault condition affecting its operation.
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 Active Emergency Braking system is not working properly, which helps in automatically applying brakes in case of an imminent crash. This fault can hinder the car's ability to stop on its own when necessary.
What the computer is actually seeing
The system monitors inputs from various sensors including speed, distance to obstacles, and vehicle dynamics sensors. If the data from these sensors indicates a discrepancy or abnormality beyond threshold values, the code C1245 will trigger.
What a healthy reading looks like
Speed inputs should register 0-20 mph for optimal AEB activation; distance-to-obstacle readings should be under the configured limit (commonly around 10 meters) for brake activation to be functional.
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. Start with a visual inspection of all AEB system wiring and connectors for damage or corrosion. Decision: Are all connections secure and undamaged? If yes, proceed to step 2. If no, repair connections and retest.
- 22. Check the vehicle battery voltage. Ideal state is 12.6V or higher at rest. Decision: Is voltage satisfactory? If yes, proceed to step 3. If no, charge or replace battery before continuing.
- 33. Using a scan tool, clear the C1245 code, then perform a road test to see if it reappears. Decision: Does the code return? If no, the issue was transient or fixed. If yes, proceed to step 4.
- 44. Test the AEB sensor(s) using the scan tool to monitor live data while replicating conditions of operation (obstacle detection). Decision: Are the sensor readings within expected values? If yes, consider module programming/updates. If no, replace malfunctioning sensor.
Common causes
- Faulty AEB sensor
- Wiring issues or connectors for AEB sensors
- Software glitch in AEB control module
- Low battery voltage affecting system performance
Typical repair cost
$$$ (typically between $400-$1200 depending on the issue)
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive the vehicle, but you will not have the AEB assistance, which can be a safety risk in critical situations.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this problem occur so often?
The AEB system relies on various sensors that can be vulnerable to environmental factors and wear, leading to faults.
Working a real vehicle right now?
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