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Discussion Starter #1
First time getting any type of CEL. Sitting in the driveway after having just started engine and noticed CEL light on. Scrolling through the screens to look at Oil Pressure, Temp, etc.., when Low Oil Pressure light followed by Service Electronic Throttle (I think) and engine shut down. Sat there a minute thinking "oh crap." 2015 Laramie Longhorn with 99,428miles. Hit the start button again and it tried to start but wouldn't turn over. Looked under the truck and no oil on the driveway, but still stressing out.

I have GDE tuned ECM installed. Put OEM ECM back in before calling dealer for tow. After doing the swap, I went ahead and hit the ignition and let it cycle up and then hit the start button and it started right up. No CEL, no warnings and sounded totally normal. Drove a couple miles down to Lowes and back, no issues.

Deciding now whether to try to make 20mile drive to the office, or still have it towed to selling dealership, which happens to be just down the street from the office.

I'm just wondering why it would get these warnings and engine shut down with the GDE ECM, and seemingly run fine with the OEM now installed?

On a side note, just got the claim approval paperwork Wednesday and was going to swap them out to get the AEM update anyway. I usually put 100miles on the OEM module before taking the truck into the dealership for anything.

Guess I'll try and make the drive and see what happens.
 

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Just drive it with stock ECU and if it melts down all the way dealer will have all the codes and data logging they need to pull off the stock ECU.
 

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Discussion Starter #4
Made it to the office, no issues. A few errands to run and will keep monitoring. Not that much of car tech guy that I've ever bothered to get any type of code reader. Don't know if it could still be read after swapping out the module. Dropping the truck off Monday morning for the AEM update after putting some miles on it over the weekend. If it makes it through the weekend.
 

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codes are stored in the ECM you removed , ( the GDE one )
if there is something wrong with the truck , the CEL should appear again
then you or the dealer should see them in present stock ECM , wow , at 99,428 miles , how lucky is that ,
before turning 100,000 K and being told " out of warranty "...
 

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Discussion Starter #6
codes are stored in the ECM you removed , ( the GDE one )
if there is something wrong with the truck , the CEL should appear again
then you or the dealer should see them in present stock ECM , wow , at 99,428 miles , how lucky is that ,
before turning 100,000 K and being told " out of warranty "...
Good to know. I wasn't sure if codes were stored anywhere else. I'm guessing then that the dealer will have no clue unless it happens again. So other than buying a code reader, my only way to know is to take it into a local shop with the GDE module reinstalled?
I did send an email to GDE as well. Was surprised I got a reply from them after hours. I will probably swap GDE back in after the AEM update Monday.
So far, no new CEL or warnings.
I was thinking the same about the mileage, but I do have the 6/120,000 extended warranty as a back up.
 

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Those trucks are very Finaky , you wrote "" noticed CEL light on. Scrolling through the screens to look at Oil Pressure, Temp, etc..,
when Low Oil Pressure light followed by Service Electronic Throttle (I think) and engine shut down.""
..
whenever engine shuts off , the dash shows oil presssure warning , and other lights , just take a look now while everything runs great ,
sometimes just touching both gas and brake pedal at the same time , the truck throws a fit , bizarre that it acted the way you described
on other attempts to start the truck .

a cheap scanner here : https://www.wish.com/product/57b715f9f2bc0a5078fca0d1?hide_login_modal=true&from_ad=goog_shopping&_display_country_code=CA&_force_currency_code=CAD&pid=googleadwords_int&c={campaignId}&ad_cid=57b715f9f2bc0a5078fca0d1&ad_cc=CA&ad_curr=CAD&ad_price=34.00&fallback_cids=5a155ab4ef7b892896986b035ad9003c1b3a825219be84c05852bafdfef4091993814d1c5bddb600f954d41f8f8300cf5a307a688654037d58e422805b80dbaaf17ebf18f86f3f93&campaign_id=1643927883&gclid=Cj0KCQjwocPnBRDFARIsAJJcf97qUC0fe1nN7-4--MvjntqQyxhIA_XkdIJep8RwkRjabS6SpTZvzGgaAoHJEALw_wcB
 

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Discussion Starter #8
I had read about the gas/brake pedal issue in other threads. I don't think that happened, but I wasn't paying that close of attention at the time. Everything seems to have been normal for the past week. There are some noticeable differences in performance during the 350miles driven with the OEM module in there.

Dropped the truck off for the AEM recall/update this morning. The dealership is only about 2miles from my office and the GDE module will be going back in as soon as I get the truck back this afternoon. I'll be holding my breath when I go to start it up.
 

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Discussion Starter #9
AEM update done, 2mile drive back to the office, swapped GDE module back in.

Got the shop next door to hook up their code reader. P0087-Fuel Rail/System Pressure Too Low, and P016F-not known to their coder.

View attachment 80572 View attachment 80574 View attachment 80580 View attachment 80582

Cleared the codes. Sending follow up email to GDE as well.

Driving down to San Diego and back tomorrow, so we'll see how it does.
 

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Discussion Starter #11
So after putting in a search on this forum for P0087, found this is not an uncommon occurrence. From my reading, popular opinion seems to be that this may be due to running the fuel below 1/4 tank affecting the fuel/lift pump in the tank. Some tried changing the fuel filter to no avail. I still have not read yet where a real solution was found, but I'm still looking.
I will admit I am one of those that runs my tank down to the Low Fuel warning often. Looking through my mileage logs, my average fill up is between 23 and 24 gallons with an occasional one at 25gal. The tank had just been filled two days before (24.8gal) and only had 70 miles driven on it when I experienced the shut down. I guess just because I can get 600+ miles on a tank, maybe I shouldn't. I think I'll start filling up at the 550 mile point going forward.
 

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Discussion Starter #12
all I have on P016F :
"" P016F - that is a low fuel pressure code
can be fuel filter , if not , it can be a faulty fuel control actuator
see post # 53 by AZ rattler , in this thread :
https://www.ram1500diesel.com/forum/ram-1500-diesel-general-discussion/59692-p0299-dealer-replacing-fuel-injectors-3.html#post913360 ""

,,,
Thanks for that link. I hadn't done a search on the P016F code yet. At the very least I am learning that if a dealer says "contaminated fuel", DO NOT believe them.
My issue will be if it happens again with the GDE module in there, do I take it to the dealer that way, or swap back in the OEM module to see if it throws the code and then take it in?
As reported earlier, drove just over 350miles this past week with the OEM module in it without experiencing the shut down again.
 

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Glad that the original CEL and problem was not what you feared.

Do an update if there is a change. Now enjoy the ride.
 

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Discussion Starter #14
Final update for this, I hope. No new CEL or warnings over the weekend. Everything seems to be running as normal. I have been occasionally letting the fuel pump prime before hitting the start button, and I'm not hearing any unusual noises.
No issues during trip to San Diego on Saturday. Had to fill up while down there and only got 23.3MPG (hand calc) on this last tank. 350 of 550 miles driven with OEM module vs GDE module.
Rolled 100,000 on the way home Saturday night. I had never reset trip B and tried to record it turning over but was .3 miles too late as it reset to zero at 99,999.6.
Love this truck! Happy Driving!
 
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