2007 Equinox 3.4 U0131 No Comm to Pwr Steering

Ben & Tyler,

About 6 months ago, or less I had trouble with the EGR, I followed Paul's advice and checked the passage in the intake. While I had the throttle body off I cleaned it so it should be in good shape. In regard to the freeze frame, since it's a pending code I don't get any freeze frame I guess because there's never anything there when I check, however, a few weeks back when this all stated up again with the P0300 and my daughter called cuz the MIL was on, I did have freeze frame and I could see it was at idle when it coded. Today when I was driving it the only very few misfires I saw were at idle, accelerating, cruising and decel, no misfires.

Ben... I checked that ground today, I don't understand what I saw. I checked the resistance from the battery ground to the eyelet, I buried the point of the probe into it to be sure I got under any amount of oxidation that may have caused a false reading. I saw about 2 ohms or so. I didn't like that so I removed the eyelet and tested it again touching at the inside diameter of the eyelet and saw... zero ohms. wth?! how could it possibly be better disconnected? At any rate, I used some fine sandpaper and shined up the mounting surface on the eyelet taking care not to break through the copper plating and also cleaned up the steel bracket it was attached to. I coated the surfaces with dielectric grease and reassembled it. Now just touching it shows zero ohms and loaded it shows a voltage drop of 9.6 mV

I put it all back together, jump started it and drove it for an hour, I didn't like the LTFT at 11 and the fact that the calculated airflow as 5 to 7 gramps/sec more than the MAF reading so I cleaned the MAF and drove it a bit more. I saw an improvement, the LTFT now is around 5 to 6. But, once I shut it off and put the ammeter on it I saw a draw of 495 mA. I watched it for about an hour and it never got below 400 mA so I started pulling fuses once again and the CLSTR fuse dropped it to 9 mA, I assume that is the Instrument Cluster. So, once again, it's something different popping up. I watched for about 10 seconds, reinserted the fuse and saw the tach and speedo jump and react to the applied power, then settle down. The current draw went right back up but within 30 seconds, was back down to 9 mA. Why? I just don't get it. If it wouldn't settle down before why does it settle down when everything else is under power except it when it's powered up. So, I closed the battery disconnect, turned the key on, turned on the blower, the wipers, the rear wiper, moved the windows, shut everything off, opened the knife switch, started a timer and within an hour it was back down to 9 mA.

Nothing is consistent on this thing. One little thing I found though was a cracked evap purge solenoid vacuum nipple, must not have been leaking much though or I'd have gotten a code for an evap leak when it wasn't able to pull a vacuum on the tank. I fixed that before the hour long drive I mentioned earlier. Also, the passenger seat data is showing "Small 1" when I am in the seat, and "Small 2" with me a 5 gallon jug of water in my lap. I weigh 150# by the way. I went to the functional test and tried to recalibrate it but it says the module is locked and SPS is required to unlock it. Seems like these modules have gotten corrupted somehow. It's really tempting to get a Jbox and reflash them.

One last thing speaking of modules, you asked if the BCM was a new one, Ben, when I had the console apart today I noticed that it is a Denso, why am I not seeing AC Delco? Aren't all GM modules AC Delco?

Sorry for the long post,
Gary

I assume you mean ma and not mv? As far as modules go that may be a reman I know Dorman makes a reman module for these worst part is there almost as much as an oem one.... might be worth checking grounds on the instrument cluster as well maybe you have an issue there I can get you diagrams for it if you need it

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Sorry, yes, mA, I edited it, it's been a long day. I will see if the wiring diagram that I have access to shows me where the instrument panel ground is, if I can't then I'll have to ask for help.

I emailed the old Verus log to you.

Thanks Ben,
Gary

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Hmm that didn't come out legible I'll repost in the am

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This was before the bcm replacement? and I assume you have replaced the wheel bearing and the low voltage code was likely from a dead battery from your parasitic draw. Was the Vin reprogrammed ? I'll look into it more tomorrow.

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Ben wrote: ... might be worth checking grounds on the instrument cluster as well maybe you have an issue there I can get you diagrams for it if you need it

G201, same ground as the BCM. One thing I should probably do it check it from the BCM connector, that way I can make sure the crimp on the eyelet is getting a good connection. Today I was checking from the eyelet itself.

Hmm well then check voltage drop at your power wires into bcm and maybe instrument cluster and probably wouldn't hurt to check the power steering module as well I'll supply diagrams on those if you need them

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Hey Gary just wondering if you made any headway on this car the network codes can be set by a low battery I don't remember maybe we discussed that and decided that was not the case with this code if you need any info I'm happy to pull it up and post it I'll be near my shop computer all this week .

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Even though the Pico was saying that battery was still good after being fully discharged several times and staying that way for days, I came to believe it was not any good after all. I had it charged up and put the DMM on it set to max/min and watched it for a full 24 hours, the car was drawing between 2 and 15 mA for about an hour or so, then would burst up to 180 mA for some period of time but I could never catch it. It must just be for an instant, I read somewhere that there is a type of a keepalive for the Instrument Panel and it sounds like that may what it happening. At any rate, it's been sitting for three days now and it is still doing fine, even with all of the doors open for several hours, you'll read about that in a moment...

So, my next task is to get the passenger airbag working, according to my Solus and GM TDS I need to unlock the module and then hopefully my scan tool can perform the preload test and get it going again. I'm not getting any errors, it just is way off on the calibration. With me in the seat it says Small 1 and with a 5 gallon jug of water on my lap it says Small 2. I don't know what it supposed to say for an adult, hopefully it just needs calibration.

So in all that digging around, scanning the modules I see that I have no module information on the Power Steering, the module communicates, it just there are no PIDS that say anything that I can use if I do have to reprogram it; no base model part number nor end model part number, etc. Along with that I am getting a No Communication from the Heated and Ventilated Seat and also from the Rollover Sensor. That car does not have Heated Seats so it sure makes sense that there would be no communication from the module cuz it ain't there, but what is talking to the scan tool to even lead it to believe there should be something there? And the rollover sensor isn't there either, I had the seats and the carpet up to check the grounds under the seat/carpet and I was looking right at the SDM (airbag controller) and the rollover sensor is supposed to be right there, either beside or behind it according to Mitchell and I think I saw that on TDS as well. Any ideas on what's up with that?

I'm considering getting a Jbox to unlock the Passenger Presence module, I've had it in mind to get one for about a year and I think it's time. Does anyone have any experience with Tech2Win with a Jbox? I am wondering if I will be able to run that injector balance test that keeps failing saying "Fuel Enable Flag Not Set by Theft Deterrent System". I'm also wondering if that Fuel Enable flag could be affected by the BCM in some way.

Thanks in advance,
Gary

Ben wrote: This was before the bcm replacement? and I assume you have replaced the wheel bearing and the low voltage code was likely from a dead battery from your parasitic draw. Was the Vin reprogrammed ? I'll look into it more tomorrow.

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Ben,

I apologize, somehow I missed this question, yes this (everything in the Verus report) was all before the BCM replacement one month to be exact, and about the wheel bearing, I think you may be referring to the ABS sensor code... well, I followed along with one of Paul's videos to test the sensor and thought it was bad, turns out Paul did a later video explaining how to test the latest type of sensors, I don't remember the details at the moment but they are powered up off the 12 volt line I think and then they vary the current draw in square wave kind of fashion iirc. At any rate, I retested it according to the new information and it was good. Now I've a spare sitting on the shelf cuz I had ordered a replacement already and opened the bag.The original is still in there and the ABS module hasn't said anything about it since. This is a recurring theme with this car.

I'm not sure how to see if the VIN was reprogrammed, I will go out and see if there is a PID for it. I sure hope so, but I didn't think they would start and run without it, but I know so little about these. I'm learning but I have a long way to go. Unfortunately, the technology is probably outpacing my learning speed.

Thank you so very much for checking up on me! I really appreciate that.
Gary

What scanner are you using now?

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Ben,

I have a Solus Edge running version 15.2

Gary

I may have asked this already but what modules do you have codes in and what are the codes is it only the u0131 in the bcm and the p0300 in the ECM or do you have codes elsewhere also don't clear the codes as they come up let all the spice cycle monitors complete so we can see if we have any more codes that haven't come up yet

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I just drove it tonight for the first time since putting the new battery in Sunday, started up just fine but the battery voltage was down to about 12.0 so not too great from the 12.8 Sunday. The alternator was charging at a rate that pegged my inductive gauge, it reads to 75 and it was past that some. I may yet have some battery drain issues to contend with but I am gonna focus on this P0300 for now.

We drove it to my daughter's house, stayed for dinner and a visit, about 2 hours later we left and the check engine light came on within two blocks after leaving, it is a P0300 and that is the only code that I see right now.

I was most disappointed to see that I have no way that I can find to save the Freeze Frame data like I can in my Actron. Is there a way and I am not seeing it? (Solus Edge)

I called SnapOn today and talked to them about that "Fuel Enable Flag Not Set by Theft Deterrent System" when I try to run the injector balance test, they said it is rare but they have seen it and when it does happen not even using a factory scan tool will solve it. He suggested turning the car on, waiting about a full minute or so and then connect the scan tool, but it did not help.

One more new oddity, on the way there, about 20 minutes into the trip the charging rate dropped to about 13.2 from 14.4, no idea why, it was fine once again on the way home. I think this thing has a poltergeist. :evil:

The modules that I have had codes in the last few weeks are the ECM, the P0300 and the BCM has been complaining about a no comm to the power steering, I think that is all.

Gary B wrote: We drove it to my daughter's house, stayed for dinner and a visit, about 2 hours later we left and the check engine light came on within two blocks after leaving, it is a P0300 and that is the only code that I see right now.

I was most disappointed to see that I have no way that I can find to save the Freeze Frame data like I can in my Actron. Is there a way and I am not seeing it? (Solus Edge)

There is no way to save it directly, unfortunately. I just end up using the 'S' button mapped to the screenshot function, and just take a screenshot for every page of freeze frame data. It's about eight shots on a GM, but better than nothing. :lol:

Sounds like the miss comes back after sitting for a few hours, then... Just thinking about how you can set the vehicle up to catch it misfiring.

I called SnapOn today and talked to them about that "Fuel Enable Flag Not Set by Theft Deterrent System" when I try to run the injector balance test, they said it is rare but they have seen it and when it does happen not even using a factory scan tool will solve it. He suggested turning the car on, waiting about a full minute or so and then connect the scan tool, but it did not help.

Interesting. :blink: Sucks that it didn't help, but I'll keep that one in mind for next time.

One more new oddity, on the way there, about 20 minutes into the trip the charging rate dropped to about 13.2 from 14.4, no idea why, it was fine once again on the way home. I think this thing has a poltergeist. :evil:

This may not be a bad thing! GM is famous for having a bazillion different 'charge modes', depending on battery temp, charging system load, state of charge, on and on. A shop owner I used to work for once told me to check an alternator for overcharging, as the gauge was showing over 15V on a test drive. Nope, normal condition at times.

Hi…
I would look at all connections pcm etc. This vehicle is known for bad connections. I have found issues just an inch or two in the harness. I also found bad body Grounds the same way. I also found that the person before me opened one of the pins on the PCM thus not making good contact…


Good luck.

Doc n2mx

Doc n2mx wrote: Hi…
I would look at all connections pcm etc. This vehicle is known for bad connections. I have found issues just an inch or two in the harness. I also found bad body Grounds the same way. I also found that the person before me opened one of the pins on the PCM thus not making good contact…


Good luck.

Doc n2mx

That's funny years ago I worked on a nearly new 1 it had a oxygen sensor heater circuit code ended up being the pin wasn't inserted in the ECM connector all the way. I believe it was from the factory that way

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Tyler wrote: Sounds like the miss comes back after sitting for a few hours, then... Just thinking about how you can set the vehicle up to catch it misfiring.

It was bad first thing this morning, probably a dead miss on Cylinder 2 for a while, it counted up 388 misfires in about 30 seconds. Got better pretty quick and as soon as I got it in drive and started down the road it was fine. It almost never misfires when it is not idling.

Tyler wrote: This may not be a bad thing! GM is famous for having a bazillion different 'charge modes', depending on battery temp, charging system load, state of charge, on and on. A shop owner I used to work for once told me to check an alternator for overcharging, as the gauge was showing over 15V on a test drive. Nope, normal condition at times.

Hopefully that's all it is then, on the way home it settled down to 12.8 pretty early on. When I got home I put the inductive gauge on it and it was less than 20A, that, I would think, could be accounted for with the fuel pump, modules, etc.

I put the Pico on it tonight, I have secondary ignition waveform saves from each cylinder and Vlotage/Current Ramp from Cylinder 6 Fuel Injector, it's the only one I can get voltage on. I looked as the current ramps for most of the rest of them, I couldn't identify a couple of them, but the one I was most interested in is cylinder 2, that is the one that had the really high count this morning. Cylinder 2 misfires at a rate of about 5:1 for the others.

Gary