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.

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.

Is the ABS pump on my Mazda 3 faulty?

MODEL 2010-2011 MAZDA3 It sounds like Miami weather. I really have the feeling this error is related to the temperature but cannot find out why. This looks like another lead I should explore. Any other idea ? Dear all I got an update. Yesterday I got the car diagnostic by another mechanic. DTC code C0020.

What is code c0020 on Mazda 3?

Unable to clear Code C0020 with an ODN/ABS scanner. Checked the harness for open and shorts and related fuse and all seems ok. Failure is pointing to the actual ABS motor control unit.

What does the code u0121 on a CAN bus mean?

At the ends of the bus, there are two terminating resistors. Code U0121 indicates the ABS module is not receiving or transmitting messages on the CAN bus. Code U0121 is typically caused by one of the following:

How to read ABS / TCCM / PCM codes?

The 0 converts to a P0 followed by 172, which is combined to be code P0172. 5. To clear codes, send the following commands: Click to expand… Response should be “6C F1 XX 54”.

What is the OBD 2 fault code for ABS?

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 does the p0731 code on the PCM mean?

What the P0731 code means. The P0731 code occurs when the PCM detects a discrepancy between the speeds of first gear’s input RPM sensor and transmission output RPM sensor. As a result, the vehicle cannot shift into first gear, and it could indicate that the transmission is slipping.

What does p0121 mean in engine control module?

What Does P0121 Mean? Your TPS “A” Circuit has an expected output voltage range, as does your TPS “B” Circuit (if so equipped). When code P0121 occurs, it means that your Engine Control Module (ECM) recognized that your throttle position “A” circuit’s expected output voltage has either gone above or below the sensor’s expected range.

The 0 converts to a P0 followed by 172, which is combined to be code P0172. 5. To clear codes, send the following commands: Click to expand… Response should be “6C F1 XX 54”.

What does lost communication with ABS module 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 does it mean when your ABS module says u0121?

Code U0121 indicates the ABS module is not receiving or transmitting messages on the CAN bus. Code U0121 is typically caused by one of the following: Sometimes U0121 can pop up intermittently, or it can result from a dead battery.

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