abs brake module

[jack]

hi all new here have some experience with mechanical repairs but not much with electronics
i have a 2009 Chrysler town and country 3.8 engine that has the abs brake light on (and also check engine) when i plug the scanner i get a code saying cannot communicate with abs module not sure if my diagnoses is right but i take that the abs module has to be repaired or replaced i found a new one online for about 200 a mechanic quoted me 1000 to repair it
my questions are
1 can i just replace the module or do i have to program it
2 can i send it to a place like module masters for rebuilding
3 is my diagnosis even right
thanks for any help

Topic

[jack]

one more thing i forgot the speedometer also does not work

[Richard Kirshy]

First thing: Is your scanner capable of reading ABS?

Next thing, if the ECM cannot communicate with abs module.
That does not necessarily the ABS module is dead and requires replacement.
There may be a bad connection or damaged wire causing the issue.
Now about your speedometer not working …
That may also be causing a issue with the ABS.

[jack]

my scanner is able to read abs faults its an anovva 3160 g and the speedometer stopped working the same time about im going to try and disconnect the wiring harness and see if i can find any corrosion i want to try removing it to see if i can have it tested or rebuilt

[Ole Eggers]

Had a VW Golf 4 that did that. It was corrosion on the plug on the ABS module. Try some contact spray and see if it helps. It did for me. Erase the faults afterwards and go for a drive.

[Richard Kirshy]

Your free to do as you please..
But I believe your putting the cart before the horse.
Consider this..
The ABS is a function of vehicle (wheel speed)
Now not knowing the system setup on your vehicle and how the ECM, ABS and speed sensors interact with each other.
My suggestion would be to trouble shoot and repair your speedometer issue.

But that is your choice..
Good luck and keep us posted

[jack]

how would i go about troubleshooting the speedometer

[jack]

from what i under stood the wheel sensors connect to the abs and the abs sends the signal to the pcm which displays it on the speedometer
when i do live data on the scan tool it always says 0 mph

[jack]

also i was under the impression if the the wheel speed sensor was bad i would get an abs fault code

[Richard Kirshy]

[quote=”qwerty360″ post=188890]how would i go about troubleshooting the speedometer[/quote]

Here is a list of the possible causes of an inoperative speedometer and/or instrument cluster on this vehicle, in order from most likely cause to least likely:

1. Instrument cluster self test, recalibrate the cluster (usually needed after a jumpstart). Try the steps at the bottom of this post to perform the cluster self-test.

2. Faulty Instrument Cluster

3. Battery cables, terminals or connections.There is a small orange wire that goes to the battery positive terminal that can get corroded and/or break or become loose. Clean and tighten the battery connections and this orange wire in particular. It should be completely free of corrosion.

4. Faulty body control module or other miscellaneous modules. This can be diagnosed with the test below.

5. Problem with instrument panel wiring or wiring connector.

6. Blown fuse #24 or fuse #21

7. Battery re-connect. Sometimes the battery just needs to be disconnected for 5 minutes to let the modules reset.

I would check all of these things before deciding to replace the cluster or any module.

*Check to see if the instrument cluster will perform the self test: Begin with the ignition switch in the off position. Hold down the trip reset button until the word “Sof” and a number appear in the odometer window. If the cluster will not self test, then it is most likely a bad instrument cluster.

If a compatible scan tool is available:

Try to communicate with all the modules on the vehicle to see which ones are working and which ones are not.

If unable to communicate with any modules, start unplugging one at a time until the communication comes back. The module that is disconnected last is taking down the bus circuit. Replace that module.

So as you can see there are many possible causes for this problem on this vehicle. Some of them are very cheap and easy to fix so it is important to check these things

[Richard Kirshy]

[quote=”qwerty360″ post=188892]also i was under the impression if the the wheel speed sensor was bad i would get an abs fault code[/quote]
Correct, but you have a comm failure fault

[jack]

i tried connecting to all the modules the only one i was not able to connect with was the abs

[jack]

thank you nightflyr for your thorough answer i will try the tests you said when i get home

[jack]

So here are the errors in getting u1110 and u0121 and u1120 I’m trying to do the display test but it’s not going is the key supposed to be off acc or on

[Richard Kirshy]

The ignition switch in the off position. Hold down the trip reset button until the word “Sof” and a number appear in the odometer window.

[Richard Kirshy]

U1110 means the PCM didn’t receive a vehicle speed signal from the Anti-lock brake Module over the CAN C bus.
If you have the U0121, then you may just need an ABS module.
U1120 is a lost wheel distance message. It has the same possible causes as the above. Both can also be caused by a short in the CAN C bus as well. You need a mechanic for this one, unless you have the proper scan tool to run a Powertrain Verification Test.

[Author]

Replies