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2013 silverado no com between modules

Customer Question
2013 silverado no com between modules
Submitted: 1 year ago.Category: Chevy
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Customer reply replied 1 year ago
at differnt times was able to pull codes u0073 u0100 u0121 u0140 abs u0100 u0140 u0137 then at times no comunication have power and ground at abs check 3 spot for body grounds all fuses good when it happens dash will shut down also
Customer reply replied 1 year ago
also vehicle looses power and then wont start for awhile no comunication to ecm trailer brake abs trans instrument steering stability bcmwiggiled wires made no differnce
Customer reply replied 1 year ago
problem started all of a sudden attempted to clear codes when i was able to comunicate but naturaly reappeared
Customer reply replied 1 year ago
i know nobody wants to get involved with this one am i right
Answered in 3 hours by:
6/7/2016
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
CHRIS ZAPANTIS
Category: Chevy
Satisfied Customers: 159
Experience: AUTO TECH at G&M EXXON
Verified

Ill give it a shot

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Did you look at the connector for the trans? They sometimes chaffe while rubbing against the trans.

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Im Chris by the way.

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Put that thing up in the air and look at the connector.

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Check for chaffing and pins pulling out.

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Let me know.

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Did I lose you?

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Customer reply replied 1 year ago
looked at connections found no pins pulled and no corosion trans abs ecm and trailer brake
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Did you check the wires by the side of the trans for chaffing?

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Customer reply replied 1 year ago
followed wires from trans along frame found no problem
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

What bothers me is that you can communicate at times. Its not constant. There has to be a wiring issue here.

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

give me a minute.

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

The connector at trans is round right?

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Also look under dash wiggle all wire harnesses to side fuse box and by break pedal they have at least to different places where rubbing has occured.

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Customer reply replied 1 year ago
trans plug is round
Customer reply replied 1 year ago
alteady did do the wiggle under dash the brake pedal is stationary so nothing was moving to wear wiggled and nothing changed
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

have you seen this bulletin?

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Customer reply replied 1 year ago
my thought something with can bus wiring???
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

yes but where are they damaged?

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Look at that bulletin it can be anywhere.

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

it can be a loss of power or ground also

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Somewhere in the harness.

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Customer reply replied 1 year ago
i sort of knew this but was hoping for some type of direction to isolate
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

I hear you.

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Customer reply replied 1 year ago
my understanding it could even be a module but dont how to isolate to take out of equation
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

What bothers me is that its intermittent

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Usually when a module goes bad its bad.

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

can you do a complete system scan? What kind of scanner do you have?

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Customer reply replied 1 year ago
a autel and geynisis
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

if you scan it right now tell me the codes

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Customer reply replied 1 year ago
which system do you want scanned
Customer reply replied 1 year ago
ecm or trans or abs or trailer brake or bcm or instument
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

it wont scan complete car?

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

scan ecm

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Customer reply replied 1 year ago
had cleared codes early in day and only ran on jack since codes came up p0700 p2544 p0575 p1506 u0073
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

ok gimme a minute

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

let me check those meanwhile scan tcm.

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Customer reply replied 1 year ago
tcm unable to comunicate bcm unable to comunicate abs unable to comunicate trailer brake unable to comunicate instrument no problem found no codes
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

can i get the eigth digit of the vin?

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

so basically you can communicate only with ecm.

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Customer reply replied 1 year ago
g
Customer reply replied 1 year ago
at this time but have been able to comunicate with the others at differnt times though out the day
Customer reply replied 1 year ago
never was able to get trailer brake
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

it does start though correct

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Customer reply replied 1 year ago
it does it was towed in would only go about 10mph then quit would not resrsrt i got it after being towed started up everytime
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

So youre a professional? I would start by diagnosing U0073.

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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Do you have alldata or mitchell?

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Customer reply replied 1 year ago
just a friend helping out and no alldata or mitchell
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

ok if its ok with you I will opt out because I get up in 6 hours. I cant help you till tomorrow night. If you want I can go through the checks with you then, or i can opt out so you can get help in the daytime. Let me know.

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Customer reply replied 1 year ago
would like to try first thing in morning with someone if possible
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

ok no problem I will opt out so you can do so. Good luck!

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Customer reply replied 1 year ago
is anybody out there to help
Chevy Mechanic: Master Auto Tech., A.S.E. Certified Master Technician replied 1 year ago
Master Auto Tech.
Master Auto Tech., A.S.E. Certified Master Technician
Category: Chevy
Satisfied Customers: 612
Experience: Over 20 years working on imports and domestic cars
Verified

I'm sorry you are having problems with your vehicle. I will try to help.

I'm a full time mechanic and have been a mechanic for over 20 yrs and I work part-time here on JustAnswer to help you and others repair their own vehicles, and I get credited by your ratings.. So before leaving the site make sure and leave me a rating. You can still reply to me as many times as neeed, even after the rating.. I will need for you to be my hands and eyes since I'm not there.

ok I will give it a stab. I just read your replys. So start by unplugging modules and as you do rescan the pickup. When the other modules are readable start plugging the rest in but leave the one unplugged and see if they will all be readable with that one unplugged. let me know what you find. Thanks Sonny

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Customer reply replied 1 year ago
well that absolutly confussed me unplugged abs scanner still on ecm unplugged trailer same unplugged trans no more comunication to ecm pluugged abs in nothing trailer nothing trans in ecm comunicated code u0121 p0575 p0700 p150c p2544 u0073 u0101 u0121 u0140 tcans codes p0121 abs codes c0110 u0100
Chevy Mechanic: Master Auto Tech., A.S.E. Certified Master Technician replied 1 year ago

just for kicks try unplugging the ecm and then scanning the rest of the systems.

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Customer reply replied 1 year ago
did you give up or quit
Chevy Mechanic: Master Auto Tech., A.S.E. Certified Master Technician replied 1 year ago
I'm sorry, I was waiting for a reply to the last thing I sent.
I asked if you would mind unplugging the ecm and checking the rest of the system with it unplugged.
It shows it went thru but maybe it didn't.
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Chevy Mechanic: Master Auto Tech., A.S.E. Certified Master Technician replied 1 year ago
Also with the GENISYS you can do a complete system scan not just ecm. So ea time you unplug modules it would be good to scan everything. Not just the ecm. That way you can see what is killing the can bus line.
Also was there any work done on the vehicle recently?
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Chevy Mechanic: Master Auto Tech., A.S.E. Certified Master Technician replied 1 year ago
Well I have to sign off for the day. I'll opt out and see if the other guy can help in the mean time.
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Customer reply replied 1 year ago
is there anybody going to respond or am i on my own someone let me know please so i can do something
Chevy Mechanic: Master Auto Tech., A.S.E. Certified Master Technician replied 1 year ago
Ok so I'm back on for the day, I apologize, I have a weird work schedule so I sign off early and back on early. I will try to help some more but not completely sure if I can help you fix it or not with out being there so please be patient with me.
So here we go, if you can, try disconnecting the ecm and scanning the other modules and see what happens.
Also check for any chafed wires down by the emergency brake. Look very closely and carefully
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Chevy Mechanic: Master Auto Tech., A.S.E. Certified Master Technician replied 1 year ago
Are you still wanting help?
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Customer reply replied 1 year ago
just not lining up on scheduje juct took truck to dealer
Chevy Mechanic: Master Auto Tech., A.S.E. Certified Master Technician replied 1 year ago
Ok no problem. Would you mind posting what they find? I'm curious to see what it is.Thanks
Sonny
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Master Auto Tech.
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Satisfied Customers: 612
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