I've had 2 separate reduced engine power warnings come across my dash this weekend while towing my 14k 5th wheel. Truck is stock, running a banks iDash and derringer. 108k miles, transmission drain and fill done 20k miles ago. Derringer has been set to level 6 since I got it years ago, without any issue, until now.

The issue arose on Friday. I was towing my 14k 5th wheel on a 3 hour trip for the weekend. About an hour in, I go to pass a slower moving vehicle. I get in the left lane going about 60, and lay into the throttle to get around the vehicle. The truck downshifts to 4th, then as its grabbing 5th, I get a severe shudder, almost like I just ran over a log and my hitch ripped out of the truck. None of that happened though, the truck just lurched for a moment before grabbing 5th gear where I complete the pass. Continue on my way, I turn off onto another highway and am accelerating again, gaining speed, going from 4th to 5th and suddenly the same sever shudder, only this time, it doesn't find a gear. I seemed to have no power, so I took my foot off the gas, put the truck in neutral, and it died. I then get a check engine light and somewhere along all that commotion I had gotten a reduced engine power warning on the dash.

I pulled over and checked all the codes.
P0093 Fuel System Leak Detected
P0069 MAP - Barometric System Pressure correlation
and a few more I didn't make note of as they pertained to turn signals and tpms issues.
Given the strange combination of codes, I wrote them all off as flukes due to the engine dieing, which at the time I was sure was an issue with the transmission shifting, as both instances were during 4th to 5th upshifts.

I then set the derringer to stock power, but left the wiring intact, and drove somewhat cautiously the rest of the way to my destination for the weekend.

Fast forward to today, returning home from the trip. About 2 hours into the travel home, cruise set at 65 mph, truck in 6th gear, and suddenly I get another shudder, similar to the ones I felt on friday, maybe less severe. However, there was no gear shifting this time, the shudder just occurred on its own. I was about a mile or so from a time when the shudder happened, and naturally as I'm slowing down into town, I get another reduced engine power warning on the dash and check engine light.

The codes I got today:
P0192 Fuel Rail Pressure Sensor Circuit A Low
B1124D Tire Pressure Sensor (The same one as friday I believe).

So at this point, I'm thinking its not a transmission issue but possibly a Derringer issue. Hindsight being that the two codes I had Friday pertained to the Fuel Rail Pressure sensor and the MAP sensor. I ignored those at the time, but having another different Fuel Rail Pressure sensor fault today leads me down that path.

So I drive to the next town to get to a more adequate place to stop, and then proceed to remove all the Derringer wiring connections to return the trucks stock MAP and FRP connections directly to their sensors. I made it the final hour home without anymore shudders. I did leave the check engine light active this time; I didn't clear the codes as I may have a dealer look at it. I noticed the exhaust brake didn't seem to function like it normally does now that the check engine light is on, which I've seen mentioned elsewhere.

Anyway, all this to say, I've removed the Derringer completely, but I'm not sure if I'm still facing an ongoing issue, or if this is just a case of the Derringer and/or its wiring harness causing some flaky readings on the Trucks PCM causing MAP and FRP sensor faults and reduced power warnings. I'm looking for a bit of confidence before I turn around and tow the camper on another 3 hour trip for a weekend getaway this Friday.

 

If it were me, I would clear the codes and using the trailer, repeat the scenario and see what you get.

 

Thats what I did Friday, and it bit me again on Sunday. I don't want to just blindly clear codes and wait for it to reoccur, especially if it really is facing a trip to the dealer. I'm hoping there is something that I can look at that I'm missing.

Friday, I was sure it was a transmission issue, so I ignored the codes at that time. I was wrong. Don't want to be wrong again on the side of the road this weekend if I can be proactive and find a resolution before heading out on the trip, or find out there's something severe wrong, and cancel my trip before it starts.

 

so we are ruling out the banks items.

Have you checked your air cleaner? Perhaps have a look at map sensor.

Also look at your fuel cap and ensure all the areas of contact on both surfaces are clean.

 

Air cleaner is relatively new, maybe 3000 miles on it. I'll pull it out and have a look.

I haven't noticed anything peculiar around the fuel cap.

MAP sensor I'll plan to pull out later today and have a look.

 

Your situation is only similar to mine in that I got the fuel rail pressure codes with my Derringer. None of the shutter. The short of it, I downloaded updates to the Derringer, still got codes. Disconnected it, drove it hard/towed, got no codes. Fuel rail pressures were normal. Called Banks and passed along my issues and troubleshooting. They replaced the Derringer and I have not had anymore codes. If I remember correctly, my unit was about 3 years old when this started. Hope this helps with your diagnosing the situation.

 

One thing to note…idash does not display permeant codes, idash only displays confirmed codes and pending codes.


a software tool like odblink will display perm, confirmed, and pending codes.


you can clear a confirmed and pending…but you can’t clear a perm code. To clear a perm code the pcm has to confirm the condition does not exist….it takes a while for the pcm to do that.


so…if you want to see all your codes…use a software tool like odblink.

 

[QUOTE=hernrick;21290447]This sounds similar. I got my iDash and derringer in May of 2021, so 3 years old at this point. Looking at Derringer updates, it looks like they haven't pushed an update since November 2020, so my Derringer is up to date. I will probably reach out to banks and see what they think.

When you got your replacement, did Banks specify what they thought was wrong with the old Derringer unit? did it come with the wire harness and the derringer module? And since the replacement, you've been running it again now with no known issues?

 

All codes were confirmed with either Forscan Lite on my Phone, or Forscan on my PC, connected to an OBDlink MX+ Bluetooth adapter. I am pretty sure that Forscan can display confirmed and pending codes, but correct me if I'm wrong. All of the codes are or were pending codes, not present at the time of reading.

Here's the freeze frame for the current code I have shown in Forscan.

 

I downloaded OBDWiz from the obdlink website, and connected with that. It shows P0192 as a confirmed code, but also notes that the Malfunciton indicator lamp is off. Which now that it look at it, it is. Sometime just now in my keycycles between plugging in the obdlink and connecting to Forscan and OBDWiz, the check engine light went out, but the code still shows confirmed, whereas Forscan shows it as Previously set, not present.

 

[QUOTE=mjs2011;21290487]I did not ask but the quick decision to replace the unit while talking on the phone seems to indicate they may have had the same issue as with other unit(s) or Banks customer service is just that good. The module was the only thing that was replaced. I use mine at varying levels during towing/non-towing and have not had any codes since obtaining my replacement. The "PC" code on the back of my unit is "61313-03-1C REV H".

Edit-replaced my unit June 2023

 

my experience is that odblink can see perm codes which forscan and idash can not.

which is important since codes that are perm can’t be cleared and needs the pcm or dealer to clear them one the pcm verifies the condition is resolved.

so…that means if you use forscan or idash….you will keep getting upper level codes which appear to be able to clear but keep coming back becuase you can see that it’s a perm code.

 

I haven't had any of the same code come back though, and have also checked with OBDLink software that none of the codes I have or had were permanent ones.

I'm pretty sure I've seen some permanent codes in the past with Forscan related to my def tank heater issue years ago. I just don't have any permanent codes now to be able to view.

 

[QUOTE=hernrick;21290556]
how had the system been running since you replaced the derringer

 

[QUOTE=speakerfritz;21297792]I have not had any more issues since the replacement iDash was installed. I've towed my 5ver down to the Texas hill country and back several times and into Oklahoma which are about 3-6 hour one way drives. This includes the hot (97 degree) summer.