Is there no communication with the ABS module?

The testing methods shown in this video can be used in any no communication condition. In this video we are working on a 2001 Volkswagen Passat. The engine is a 1.8 turbo. the customer complaint is a solid/flashing ABS and Brake light. Using the factory scantool Odis we find that there is no communication with the abs module.

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 should I do if I lost communication with my abs?

If all tests have passed and communication is still not possible, or you were unable to clear the U0121 fault code, the only thing left that can be done is to seek assistance from a trained automotive diagnostician, as this would indicate a failed ABS module.

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 is the ABS light different from the brake light?

The ABS light differs from the BRAKE light as it is usually controlled by a computer module. When this light is on, there are often trouble codes stored to help the owner or a technician diagnose the source of the fault in the anti-lock braking system. The BRAKE light on most vehicles is activated by…

Can a failed ABS sensor trigger the Bas light?

If you have an ABS sensor that has failed, it will also trigger the ABS, ESP, BAS light. Because the ESP system depends on the ABS system to function properly, the ESP system will also get disabled.

Is the TCM on a LBZ truck tuned?

Did you tune the TCM also, the A50 TCM had some issues as opposed to the A40 in the LBZ trucks when tuning them. Click to expand… Yeah TCM is tuned. Put efilive on truck probally 9 months ago and have had zero issues with the way things have been tuned.

How does the ABS module affect the brake pads?

The ABS module or in some models the SBC Brake module will apply pressure to the brake pads at each of the individual wheels depending on the directions it receives from the vehicle’s control units. While it is less likely to fail, it is known to be a problem as well. Replacing the ABS Module can be costly.

If you have an ABS sensor that has failed, it will also trigger the ABS, ESP, BAS light. Because the ESP system depends on the ABS system to function properly, the ESP system will also get disabled.

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.

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 does the ABS module work on a car?

The motor and accumulator are also used to reapply brake pressure during ABS application. The ABS module controls the pump motor and accumulator. The ABS module communicates with other onboard computers (referred to as modules) over the controller area network (CAN) bus.

Navigation