No Power | 2005 Dodge Ram 2500 | 5.9 Cummins Diesel

2005 dodge ram 2500 300x200 Photograph

2005 Diesel Dodge Ram 2500

Customer complaint was severe lack of power and performance on this 05 Dodge Ram 2500 Diesel 5.9 Cummins. Other concern was poor shifting. I took the truck for a test drive as I graphed the data with my Snap-on Modis. There were no noticeable power or performance issues under light load. As I stepped into it about 3/4 throttle or more the issue that the customer felt would show it’s face. If you jumped on the throttle the truck would get up and go and then suddenly just fall on it’s face. The low power seemed to lag a little bit after revving up. If you got on the throttle hard and held it there the power would be there, suddenly drop off, but the rpm would stay up even though all the power was gone. It really felt like loss of fuel or an excessive exhaust back pressure issue.

05 dodge cummins airfilter 300x238 Photograph

2005 Dodge Cummins Scan Data | Turbo Boost Pressure Loss

I continued my test drive while I analysed the data I was graphing. Another thing I noticed was if I backed off on the throttle after I would lose power for a few seconds, I could get back into it and have my power again for a second before it would suddenly lose it again. Very strange feel to this one. To me, it really felt like the turbo would just quit working. I also noticed the transmission shifting issue that the customer told me about but I was pretty sure it was all related to the power issue.

05 dodge cummins baro 300x241 Photograph

2005 Dodge Cummins Scan Data | BARO Pressure Dropout

Back at the shop I went over all the graph data I captured. I also noted that there were no engine codes. The three things I wanted to check after my test drive was to see if I maintained fuel pressure, had turbo boost, and no excessive exhaust back pressure. Going over my scan tool data PID graph data I could see all of this. I didn’t even need to do any hands on testing yet. Looking at the exhaust back pressure data PID indicated that I did not have an exhaust restriction. My fuel pressure sensor also confirmed that I did not lose much fuel pressure at the time of the abrupt power loss. The turbo boost pressure sensor showed a dramatic loss of pressure at the time of power loss. Now I have a place to start.

Was the PCM cutting the turbo charger? Was the turbo just going bad? Why would the PCM cut back the turbo charger? Did the PCM even have much control over the turbo charger on this truck? A lot of questions

dodge cummins airfilter 300x243 Photograph

Dodge Diesel | Plugged Cummins Airfilter

that needed to be looked at. Looking over some more scan data I captured, I noticed that at the same time I loss power, my BARO pressure also dived. The BARO reading is normally pretty flat lined as outside air pressure doesn’t change very much very quickly. What would cause my BARO reading to drop out? Well a bad air restriction between the air intake and BARO pressure sensor would. I checked the air filter…….. Not often you see an air filter that is plugged bad enough to cause driveability issues as severe as this truck. Another one in the books.

Leave any questions or comments below. Thank you.

8 comments

  • James says:

    Thank you for posting this! My 05 has been doing the same thing. I was worried it was a fuel filter or a lift pump, but I wasn’t getting any errors. I went out and checked my filter box and my filter looked worst than the one you have posted and it was sucked up into the top of the housing.

  • Kyle says:

    My truck is doing the exact same thing but I have a brand new air filter any ideas?

  • kelly says:

    im having loss of power under loads and no codes,i switched to a k@n air filter and still having the problem

  • mike says:

    Hi Travis..I have an 05..started having towing issues..use to pull good on hills now shifts down..LOW power loaded. Pulling 25psi and nuclear egts..like 1300/1400 or so, then I back out of it. No probs felt unloaded..lots of pwr. Still egts getting a bit high but cool right down, level at about 8-1000 degs at 120kms flat strech, and can spike my psi to 29/31 when i get on to it from the stop. I found a leak in the diaphram of my w/gate actuator..not too bad of a leak bad enough that I tried a mity vac and wont draw a vac. but do you think that this little bugger is wasting that much air at high load to loose approx 5psi of the boost?

  • Danny says:

    Dewitz diagnostics thumbs up.03 Dodge Ram 2500 Diesel loss of power at 2500 rpm.Your scan tool was right on the money with its graphing.I was having the same exact problem.Turned out to be a plugged air filter.Thanks

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