What does the OBD II fault code u0121 mean?
What Does Code U0121 Mean? OBD II fault code is defined as “ Data bus: anti-lock brake system (ABS) control module – no communication”, and is set when communication between the ABS brake system control module and the PCM (Powertrain Control Module) is lost for a specified time.
What’s the code for Mazda 3 at light always on?
3. Reset the ECU, start the car in neutral. Code still there, AT light always on. The second time i put the car in reverse, it made another big clunk so I avoid putting it into reverse now. I towed the car to a nearby Mazda dealership and there it waits for a $98 diagnostic.
What causes the u0121 code to be active?
If you can access codes from the ABS module, then the U0121 code is either intermittent or a memory code. If unable to access codes for the ABS module, then the U0121 code that the other modules are setting is active, and the problem is there now. The most common failure is loss of power or ground.
What does u0121 stand for in data bus?
U0121 – Data bus: anti-lock brake system (ABS) control module – no communication Trouble Code Fault Location U0121 Data bus: anti-lock brake system (ABS) c
What does code u0121 mean on a car?
What does 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.
3. Reset the ECU, start the car in neutral. Code still there, AT light always on. The second time i put the car in reverse, it made another big clunk so I avoid putting it into reverse now. I towed the car to a nearby Mazda dealership and there it waits for a $98 diagnostic.
What causes an ABS controller to set code u0121?
Defective ABS control module. In some cases, replacement of other, unrelated control modules such as transmission control modules can lead to a loss of communication, and hence the setting of code U0121. Voltage spikes due to incorrect jump starting procedures or other causes can damage one or more controllers, including the ABS control module.
Where can I buy a Mazda3 Transmission Control Module?
As I suspected, the TCM failed every test they threw at it, but it did have good power and ground going to it. So apparantly this was just a complete transmission control module failure. The TCM is $613 for the part to be ordered directly through from Mazda’s warehouse in Irvine.
Why is my u0101 code not working?
If you can access codes from the TCM module, then the U0101 code is either intermittent or a memory code. If unable to talk to the TCM module, then the U0101 code that the other modules are setting is active, and the problem is there now. The most common failure is loss of power or ground.
Defective ABS control module. In some cases, replacement of other, unrelated control modules such as transmission control modules can lead to a loss of communication, and hence the setting of code U0121. Voltage spikes due to incorrect jump starting procedures or other causes can damage one or more controllers, including the ABS control module.
What does lost communication with steering column control module mean?
Lost Communication With Steering Column Control Module What does that mean? This is a generic communication system diagnostic trouble code that applies to most OBD-II vehicle makes and models. This code means that the Steering Column Control Module (SCCM) and other control modules on the vehicle are not communicating with each other.
What Does Code U0121 Mean? OBD II fault code is defined as “ Data bus: anti-lock brake system (ABS) control module – no communication”, and is set when communication between the ABS brake system control module and the PCM (Powertrain Control Module) is lost for a specified time.
If you can access codes from the TCM module, then the U0101 code is either intermittent or a memory code. If unable to talk to the TCM module, then the U0101 code that the other modules are setting is active, and the problem is there now. The most common failure is loss of power or ground.