Stuck in PA under a load with 5mph derate. It started out with the SPN 3364 FMI 2 (bad DEF quality, conversion low) and associated derate codes. I ran a regen or two, and the SPN 3364 cleared. But the SPN 5246 derate codes are still there! And now there is SPN 5397 FMI 31 - too many regens?!
The weird thing is, I'm getting a really good NOX conversion rate, 80% or so, while regening. Shouldn't it be enough to clear the codes? Is the SPN 5297 the problem now?
This truck has always had a SPN 3364 issue when hauling 40000lb+ over hilly terrain, but usually just running it clears it up in a few miles. Not tonight...
I really don't want spend $$$ calling out a guy with a laptop when I myself am a guy with a laptop. Any advise?
Derate to 5mph crisis - regen not clearing codes for some reason
Discussion in 'Freightliner Forum' started by PermanentTourist, May 10, 2019.
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You have a legit hardware or sensor problem. Gonna have to get something fixed / changed.
When mine went to stop engine / 5 mph, it turned out to be a wire in the main after treatment wiring harness went kaput. 2 days later it was fixed after being towed in.
@bzinger just had his towed in for 5 mph derate / stop engine with bad DEF tank issue.
Might wanna start looking for a decent tow service and where a dealer is. -
If ya got a manual unplug your speed sensor at the back of the trans. Itll get ya unloaded but youll lose your speedo
Dave_in_AZ and PermanentTourist Thank this. -
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bzinger Thanks this.
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PermanentTourist Thanks this.
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bzinger Thanks this.
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PermanentTourist said: ↑I'm worried that's gonna confuse my corporate elog qualcomm box. It won't put me on drive, and then I will be getting calls from the logs department about why I am 500 miles down the road while being off duty.Click to expand...
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PermanentTourist said: ↑I'm worried that's gonna confuse my corporate elog qualcomm box. It won't put me on drive, and then I will be getting calls from the logs department about why I am 500 miles down the road while being off duty.Click to expand...
Email yourself the last 7 days before you try it.
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