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Matt, Mechanical Engineer
Category: Audi
Satisfied Customers: 237
Experience:  BEng hons Mech engineering, in auto industry 22 years
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abs red warning flashing alternates between ABS and ESP warning

Customer Question

abs red warning flashing alternates between ABS and ESP warning lamps
Submitted: 4 years ago.
Category: Audi
Expert:  Greg replied 4 years ago.
Hi ..

Can you communicate with the engine controls or the airbag system but have no comms with ABS only ..

For example did you have any engine malfunction codes .

Customer: replied 4 years ago.

thanks for replying.

I have no idea whether there are any engine malfunction codes.

I have however noticed

1. stereo stopped working, pulled the fuse and replaced it and stereo started working again.


2. one horn stopped working for some time, until I pulled the fuse and replaced it . The horn started working again.


3. Indicator relay sometimes starts clicking intermittently.


4. The ESP lamp has for a long time stayed alight while driving and sometimes comes on when the car is stationary.


5. Since the red flashing ABS light has started coming on, it seems to have affected 1. cruise control. 2. Traction control. 3. power loss from engine.


I am thinking along the lines of a problem with the Fuse Panel, or possibility of a suspected single wire which exits from the engine loom then crosses the rocker cover on the nearside travelling down the side of the engine and under by the sump but have as yet not been to trace it any further. This wire I found had been trapped under the Rocker Cover after a new gasket was replaced.

Expert:  Greg replied 4 years ago.
Hi Robert ..

This is very possible , you will have to trace the wiring harness tp be sure .

But to make it easier is to know what malfunction codes you have ,
with the codes this will help you know which and where to check on the harness.

All it takes is one ABS sensor to fail and it will cause all the other warning lights to come on
the most common is the brake light switch and wheel speed sensors ..

See what codes you can get using just PCM OBD II codes ..

Rgds Greg