Possible Causes

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

Incorrect sensor input
Stuck valve
ABS module
ABS module and HCU assembly

Fig 1: Antilock Braking System (ABS) Module Connector - C135

Courtesy of FORD MOTOR COMPANY

Harness Side

Y1: GUIDED DIAGNOSTIC QUESTION

This step is for vehicles equipped with EPB system or an electric brake booster.
Were you sent here from diagnostics in the Parking Brake Actuation article or the Power Brake Actuation article?

Yes	No
Go to Y5.	Go to Y3.

Y2: 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 30 minutes.
Ignition ON, engine OFF.
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 Y6.	Go to Y4.

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 30 minutes.
Ignition ON, engine OFF.
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.
ABS Module connector disconnected. (C135)
Using a good light source, inspect the electrical connector for the following:
- corrosion - install new connector or terminal and clean the module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary
ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
Operate the system and determine if the concern is still present.
Is the concern still present?

Yes	No
INSTALL a new ABS module. CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new ABS module. REFER to the Anti-Lock Brake System (ABS) and Stability Control article. ORDER a replacement ABS module and INCLUDE the RVC on the form. If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

Yes

INSTALL a new ABS module.
CHECK OASIS for any service articles: TSB, GSB, SSM or FSA.
If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions.
If no service articles address this concern, INSTALL a new ABS module. REFER to the Anti-Lock Brake System (ABS) and Stability Control article.
ORDER a replacement ABS module and INCLUDE the RVC on the form.
If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.

The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

Y6: CHECK FOR CORRECT ABS OPERATION

Ignition OFF.
ABS Module connector disconnected. (C135)
Using a good light source, inspect the electrical connector for the following:
- corrosion - install new connector or terminal and clean the module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary
ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
Operate the system and determine if the concern is still present.
Is the concern still present?

Yes	No
INSTALL a new HCU. CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new ABS module and HCU assembly. REFER to the Anti-Lock Brake System (ABS) and Stability Control article. ORDER a replacement ABS module and HCU assembly. INCLUDE the RVC on the form. If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

Yes

INSTALL a new HCU.
CHECK OASIS for any service articles: TSB, GSB, SSM or FSA.
If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions.
If no service articles address this concern, INSTALL a new ABS module and HCU assembly. REFER to the Anti-Lock Brake System (ABS) and Stability Control article.
ORDER a replacement ABS module and HCU assembly. INCLUDE the RVC on the form.
If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.

The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.