Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Possible Causes
2021 Ford Edge SE, 4WDSECTION Possible Causes
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
- Incorrect sensor input
- Stuck valve
- ABS module and HCU assembly
- Y1: GUIDED DIAGNOSTIC QUESTION
- This step is for vehicles equipped with EPB system or an EBB unit.
- Were you sent here from diagnostics in the Parking Brake and Actuation article or the Power Brake Actuation article?
- Y2: RECHECK THE ABS MODULE FOR DTCS
- Ignition ON, engine OFF.NOTE: To access the ABS ECU Reset routine when using Ford IDS, go to Chassis, then Braking and click ABS ECU Reset.
- Using a diagnostic scan tool, carry out the ABS ECU Reset routine.
- Clear the ABS DTCs.
- Ignition OFF.NOTE: If DTC U2007:4B or U3000:4B is present, allow the vehicle to cool for a minimum of 30 minutes.
- Ignition ON, engine OFF.
- Using a diagnostic scan tool, carry out the ABS ECU Reset routine.
Carry out the ABS self-test.
- Record the ABS module DTCs.
- Are any of the DTCs from the Fault Trigger Conditions table present and active in the ABS module?
- Ignition ON, engine OFF.
- Y3: RECHECK THE ABS MODULE FOR DTCS
- Ignition ON, engine OFF.
- Clear the ABS DTCs.
- Ignition OFF.NOTE: If DTC U2007:4B or U3000:4B is present, allow the vehicle to cool for a minimum of 30 minutes.
- Ignition ON, engine OFF.
- Using a diagnostic scan tool, carry out the ABS ECU Reset routine.
Carry out the ABS self-test.
- Record the ABS module DTCs.
- Are any of the DTCs from the Fault Trigger Conditions table present and active in the ABS module?
Yes No Go to Y5. Go to Y4.
- Y4: VERIFY THE ABS MODULE TO HCU FASTENERS
- Ignition OFF.
- Verify all ABS module-to- HCU fasteners are tightened to their correct torque specifications. Refer to the Anti-Lock Brake System (ABS) and Stability Control article.
- Are fasteners tightened to their correct torque specifications?
Yes No Go to Y5. TIGHTEN all ABS module fasteners to their correct torque specifications.
Go to Y5.
- Y5: CHECK FOR CORRECT ABS MODULE OPERATION
- Ignition OFF.
- Y6: CHECK FOR CORRECT ABS OPERATION
- Ignition OFF.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.