How do I fix code U0121?
How to repair the U0121 engine code
- Address additional DTCs that may be triggered.
- Deploy a digital multimeter (DMM) to test the CAN bus.
- Use a scan tool to attempt communication with the ABS.
- Check ABS circuits with a DMM.
- Attempt to reprogram the ABS to verify if there’s a software issue.
- Replace the ABS.
What is diagnostic code U0121?
What does OBD-II fault code U0121 mean? Code U0121 stands for Lost Communication with Anti-lock Brake System Module. Anti-lock brakes are required on all modern vehicles. The antilock braking system (ABS) prevents wheel lockup by modulating the brakes in an emergency situation.
What is ABS control module?
The ABS control module is a microprocessor that runs diagnostic checks of a vehicle’s antilock braking system and processes information from wheel-speed sensors and the hydraulic brake system to determine when to release braking pressure at a wheel that’s about to lock up and start skidding.
What causes ABS control module to fail?
The most common ABS problems occur when sensors become contaminated with debris or metal shavings. Malfunctions also occur when sensor wiring becomes damaged, resulting in intermittent or no continuity.
How do you check ABS brake module?
Zitat von Youtube: Test component activation and now these things for the returning pump this is the break part. But before we go there okay check you can check your whole brake module guys bring with the little valves.
Where is the ABS control module located?
ABS Control Module Location
The ABS control module is found in the engine compartment of most vehicles. However, it can also be found on the driver’s side frame rail in a few models. You may need to lift the vehicle to find the ABS control module. It could also be located under plastic panels or covers.
What does lost communication with body control module mean?
U0140 is a generic diagnostic trouble code (DTC) that stands for “Lost Communication With Body Control Module.” This code generally means that the BCM isn’t properly transmitting or receiving signals. A U0140 code can have a wide variety of indications.
What does lost communication with TCM mean?
It means that the transmission control module is not communicating with one or more modules that are connected with it through the CAN bus/controller area network system.
How do I reset my ABS control module?
Zitat von Youtube: Do not start your engine just turn it to the on position. And you'll know it's on when all the lights start illuminating. And step number 2 come down below and three quick presses of your gas pedal.
How do you fix an ABS control module?
If your ABS Warning Light turns on frequently, your mechanic can try to reset the ABS control module (like resetting a computer) to see if it fixes the problem by: Disconnecting the positive cable from the vehicle battery. Holding down on the brake pedal to drain the vehicle’s electrical system.