What should I do if I lost communication with my ABS module?

What should I do if I lost communication with my ABS module?

If any repairs were made, clear the diagnostic trouble codes from memory, and see if the U0121 code returns or if you are able to communicate with the ABS module. If the code does not return or communication is re-established, then the fuses/connections were most likely your problem.

What does lost communication with anti lock brake system ( ABS ) mean?

Lost Communication With Anti-Lock Brake System (ABS) Control Module. What does that mean? This is a generic communication system diagnostic trouble code that applies to most vehicle makes and models. That may include but are not limited to vehicles from Mazda, Chevrolet, Dodge, VW, Ford, Jeep, GMC, etc.

How to repair lost communication with Transmission Control Module?

Hook the red lead of your voltmeter to battery positive (B+) and the black lead to each ground circuit. Once again you should see battery voltage at each connection. If not, repair the power or ground circuit problem. Next, check the two communication circuits. Locate the CAN C+ (or HSCAN + circuit) and CAN C- (or HSCAN – circuit).

What should I do if my abs code does not return?

If the code does not return or communication is re-established, then the fuses/connections were most likely your problem. If the code returns, locate the CAN C bus communication connections on your particular vehicle, most importantly the ABS module connector.

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 Transmission Control Module is not communicating?

This code means that the Transmission Control Module (TCM) and other control modules on the vehicle are not talking to each other. The circuit most often used to communicate with is known as Controller Area Network bus communications, or simply put, CAN bus.

What should I do if my ABS module is not working?

An ABS module that does not respond to the scan tool will need to be diagnosed. Before condemning the ABS module, its circuit should be checked with a DMM. Like any other electrical device, the ABS module must have proper power and ground. If everything up to this point checks out OK, the ABS module is likely the problem.

How does ABS communicate with other onboard computers?

The ABS module communicates with other onboard computers (referred to as modules) over the controller area network (CAN) bus. The bus is composed of two lines: CAN High and CAN Low. Modules communicate over the CAN High bus at a rate of 500k bits/second, whereas communication over the CAN Low bus is limited to 125k bits/second.