2011 Chevy Traverse No Com bad ground

This video shows how a bad ground can raise the CAN bus voltage causing a no crank situation.
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[@laddie5133]

Keep up the good work Brian love your videos it's nice to see your hands on videos in the field yes your right in what u say we are all learning everyday that's why u only learn when dropped into sorting the faults out in hands on approach A1 Brian first class keep up the good work

[@andrewk778]

A great diagnostic video. I enjoy your videos. You have a nice presentation style. Thank you for sharing.

[@weldingjunkie]

Thanks for sharing Brian great video. Grounds can def lead you in wrong direction sometimes until you do tug test. I love your deductive thinking approach and bypass reasoning. Catch you on the next one.. Jay

[@wyattoneable]

Thanks. I'm trying to learn as much as I can though you smart guys. I appreciate the lessons.

[@BrianMann216]

You are smart by trying to learn. No better way to get ahead.

[@spelunkerd]

Wyatt, I keep finding your name in the comments section on videos I search out, ha ha.

[@philh9238]

i was confused for a second when you unplugged the abs module. i thought that was the culprit. but you worked your way upstream of the system unplugging the next module in line. nice work. but ifi had the schematic to look at longer i wouldnt of got confused.

[@BrianMann216]

Thanks for the comment Phil. I am always trying to keep the videos as short and to the point as possible as not to loose viewer interest. Do you think that more time of diagram on screen or talking about how I interpreted how the circuit works would be good in the future?

[@philh9238]

Yes I do think so

[@8power0]

BRIAN EXCELLENT VIDEO , THAT WAS ONE OF THE BEST SYSTEMATIC DIAGNOSTIC PROCESSES I HAVE EVER WATCHED . I CAN ONLY DREAM OF BECOMING A TRUE DIAGNOSTICIAN ON THIS LEVEL ONE DAY . I HAVE A QUESTION , FOR GENERAL DIAGNOSTICS AND RELEARNING IS A JUMP BOX ADDIQUIT . I HAVE BEEN LISTENING TO YOUR ADVICE ON STABILIZING THE POWER OF THE VEHICLE YOUR WORKING ON I HAVE SEEN YOU USING POWER SUPPLYS IS THERE POSSIBLY A LOW COST POWER SUPPLY YOU MIGHT BE ABLE TO SUGGEST THANK YOU SO MUCH AND PLEASE KEEP UP THIS GREAT CONTENT YOU ARE TRULY APPRECIATED !

[@richarddavis9886]

Thank you good information I'm going to check that ground get the car up in the air on the hoist and check the engine ground I just clean the battery terminals up and I just clean the ground cable from the battery to the frame of the vehicle

[@spelunkerd]

Excellent practical demonstration. I had always thought there were only two 120 ohm CAN resistors in parallel, giving 60 ohms when measured at the DLC. To my surprise, in the schematic shown at 4:13, there is a 120 ohm resistor inside the DLC itself (on top of the one shown in the Diff control module and the ECM)! Hmmm, that's confusing. Is that resistor inside the DLC out of the circuit when you measure resistance from a breakout box? Do you still normally get 60 ohms if you measure at other CAN tap points, say at a (still connected) module somewhere else?

[@BrianMann216]

Good observation. If you look closely you will see on the schematic in little boxes in those circuits saying -MH8 or MH8 (I think MH8 or MH6 hard to see in video I even looked up schematic and hard to see there as well). The vehicle has one or the other so still just 2 120 Ω resistors on this Bus. So if this vehicle does not have a rear diff module one of the 120 Ω resistors will be all by itself. Note usually the stand alone resistor when equipped will be near the optional module that it is in place of, however there are exceptions, always consult SI. Would it be helpful if I do a video on wiring diagrams?

[@spelunkerd]

@@BrianMann216 Brian, thanks for the response! I get dealer repair manuals for all the vehicles I work on, but the communication networks are often not discussed in enough detail to help with repair. Presumably dealers have other documents that explain those connections more fully, but I haven't been able to find any of those. Thanks for your video like this one! Well explained communication diagnostics, like shown here, here are gold. Dave

[@johnf6687]

It was always a big issue 02 sensor ground s and coolant sensor pigtails”

[@thisisyourtransmission]

Good job. Question, how did that bad ground make the can bus signal high voltage?

[@BrianMann216]

The chips within modules are provided voltage , powers and grounds that is , from the module it self. If the low reference (ground) for the module is high, all the low refreences for the vehicle will higher than they should. IE a old school GM PCM can have a bad ground and still communicate , however sensors on the 5v reference will all read higher than they should. Everything can get skewed.

[@thisisyourtransmission]

@@BrianMann216 OK, you know how I am. I put things in layman terms. You are saying "if the foundation is crooked, then the whole house will be crooked.

[@brucedavenport3335]

Brian 2011 traverse starter dragging replaced it. car on start fuel pump doesn t run check engine flashes fast

[@neverstoplearning382]

Hello sir and thanks for this great explanation. Do you know any good book for CAN communication understanding and troubleshooting. I really need to get better at this. Your feedback is much appreciated. Best regards.

[@BrianMann216]

Wiki pages and the web have lots of great information IE www.csselectronics.com/screen/page/simple-intro-to-can-bus/language/en. Also many companies produce some great manuals IE ATG ( automotive training group),

[@ladedrickharris4965]

I am having the same issues with a 2010 Chevrolet Traverse 3.6l. I have a crank no start after engine replacement. You did not show how you back probed your wires on the TCM or any wires.

[@hb0mbnonya590]

My 2011 traverse died while driving & there were never any lights that came on , on the dash twice & even with Battery charged it acts like it doesn't want to start... Please help me Thanks :At my wits end

[@johnny_5inco]

Did you find the culprit?

[@michaelwoon5242]

What exactly was the root cause in this particular case? G110?

[@BrianMann216]

Yes it was the bad ground.

[@hughganis9015]

@Brian Mann I really enjoyed the video I’m a student at a tech school to become an auto technician but in my spare time for extra money I run a tiny shop. I recently done an engine swap on a traverse and run into the same issues. Wiggle the same wires and was wondering if you can give me an idea of witch ground solved your issue and where is it at. It would be much appreciated. Thanks.

[@hughganis9015]

Also ignore my name on here.

[@jessewilkinson1010]

What could cause no electricity inside the vehicle outside of the vehicle but it still gets power to the fuse box

[@BrianMann216]

Bad connections, open circuits, blow fuses.

[@jessewilkinson1010]

@@BrianMann216 what could cause the circle around the park indicator to not show and car still doesn't start

[@BrianMann216]

@@jessewilkinson1010 really depends on all kinds of things, No comm with TCM, other comm issues, wiring.... the list goes on .. what codes are setting?

[@sanjonewio4085]

I'm having the same problem

[@justinpuzak2558]

What were some of the symptoms when costumer brought it in?

[@BrianMann216]

No crank, no start, no communication.

[@rkonarske]

I’m having the exact problem, no check engine light, no crank, no start, no communication. Can I ask what ground it was? Where was it located? Desperate for help before sending it to shop.

[@juanmondragon87]

Did you get the answer? I got the same issue

[@8power0]

BRIAN EXCELLENT VIDEO , THAT WAS ONE OF THE BEST SYSTEMATIC DIAGNOSTIC PROCESSES I HAVE EVER WATCHED . I CAN ONLY DREAM OF BECOMING A TRUE DIAGNOSTICIAN ON THIS LEVEL ONE DAY . I HAVE A QUESTION , FOR GENERAL DIAGNOSTICS AND RELEARNING IS A JUMP BOX ADDIQUIT . I HAVE BEEN LISTENING TO YOUR ADVICE ON STABILIZING THE POWER OF THE VEHICLE YOUR WORKING ON I HAVE SEEN YOU USING POWER SUPPLYS IS THERE POSSIBLY A LOW COST POWER SUPPLY YOU MIGHT BE ABLE TO SUGGEST THANK YOU SO MUCH AND PLEASE KEEP UP THIS GREAT CONTENT YOU ARE TRULY APPRECIATED !