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2012 Road Glide Ultra. 16K miles. w/Thunder Max ECM. Code U1040 - what is it and what is the solution?

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DTC U1040 indicates that the ABS module is not capable
of sending its state of health message. ( and this makes the ABS Light not flash ) check connections on the Module ...all fuses ...

Possable causes :
Open ABS fuse
Open battery circuit
Open ground circuit
Open serial data circuit
Short to ground in power circuit
ECU malfunction

Posted on Oct 18, 2013

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SOURCE: ultra classic 99 changed air filter to k/n do i

changing the air cleaner is like installing a stage 1 kit, if you have not replaced the exhaust but plan to, do it before you have the ECM redone.

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SOURCE: were are the batterys located

Quickest solution is to call your Harley dealer service center. My softail battery is under the seat.

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SOURCE: 2002 harley davidson electra glide ultra glide classic will not start

test batt--must be at 12.6 v for proper fire--mite hav a bad one or alternator is failin------get a book on maintenance details

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SOURCE: what the max pressure for rear shocks on a 2012 ultra classic

Max pressure is 50 psi.

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I have a 2013 road glide and just painted inner faring and hand controlled I got it all back together and the dash will light up but I have no ignition to the motor or turn signals or alarm I also checked...


the part numbers are just part numbers, no diagnostic significance for your problem.

U1040 is a priority 8 and = Loss of ABS serial data

You will need to find out what wiring or connector(s) etc was/were damaged when you had the inner fairing off.

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If I remember correctly this is an ABS code. Try changing the ABS fuse then clearing the code. I know this has worked in the past. Good luck.

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2012 Road Glide Ultra. 16k miles. w Thunder max ECM. Throwing code U1040. What is it and what is the solution?


U1040 = Loss of ABS serial data

Does the "CHECK ENGINE" light stay on?
If not, then it's a "HISTORIC" code (not current).

Clear the code and see if it comes back, as it might have just been a glitch.

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