If the traction control system is not working after the anti-lock brake control unit has been replaced, it is possible that the two systems are related. The anti-lock brake control unit is responsible for modulating the brake pressure to each wheel, and the traction control system uses the same sensors and actuators to control wheel slip. If the anti-lock brake control unit is not functioning properly, it could affect the traction control system's ability to function properly.
To remedy this issue, you should take your vehicle back to the service garage and have them inspect the work that was done. They may need to re-install the anti-lock brake control unit or replace it with a new one. They may also need to reprogram the traction control system to ensure that it is working properly.
