Compression Ignition Addict
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One time power loss during regen
I experienced a power loss issue over the weekend, which I can't reproduce, but concerns me. Details below, If anyone can provide some feedback it would be appreciated.
truck: '08 F250, 6.4L, 74K miles
Issue: I was driving along ~70mph using cruise control Saturday and without warning, cruise control was kicked off, and I had an immediate loss of power. I was able to maintain speed at ~50mph with very little throttle or boost response, going down hills, and on the uphill, I could barely maintain 35 mph (gentle hills). The transmission wouldn't downshift when I hit the throttle, but I think that's because the motor wasn't producing any power. If I floored the accelerator I could get the RPMs do go up just over 2000RPMs, but no boost to support.
Hesitant to pull over to the side of the highway and strand myself with the family in the truck, I limped along to the next exit (10-12 miles down the road). While I was limping down the road, I ran through the on board diagnostics tool several times. No Check engine lights, no check transmission lights, the only item that popped up was that the truck was in regen mode. Two things to note here. First, in the 5 1/2 years and 74K miles that I've owned this truck, it has never lost this type of power in regen mode before, ever! Second, usually regen lasts 5-8 minutes. During this event, regen just kept going. I monitored it for over 10 minutes, and I assume that regen started before I started monitoring. So, it was a very long regen cycle that didn't terminate (at least as witnessed in the diagnostic screen) until I shut the truck down.
When I exited the highway, there happened to be a Ford dealership, although it was closed, I figured that would be a good place to get stranded if I shut down the truck and it wouldn't start or go. So, I did. I shut down the truck, gave it a minute and then started it back up. I took a ride around the block. Regen mode was no longer active, and I was no longer having power issues. We proceeded on our trip without issue.
I've put close to a hundred miles on the truck since the event, with no further instances, and no error messages.
I'm preparing for an extended trip and this issue concerns me. I'll be traveling 1000+ miles, towing a large load. If this event had taken place while towing, I would have likely had a serious issue.
I'm afraid that since there were no error messages, if I take it to the dealership they aren't going to be able to find anything wrong.
My question is has anyone experienced this type of issue in the past, or can any of the techs out there help explain what might have happened? I see lots of threads about power loss during regen, but none seem to match exactly. I'm honestly not sure whether the regen caused the power loss, or was a result of the event.
2008 F250 CC 4X4
Job I 6.4L