I had a wrench icon come on the dash about a mile from work this morning. Didn't notice any difference in driving that last bit. Got to work, left it on and saw it was supposed to be limp mode. I happened to have my code reader with me and didn't get any codes. Stopped the truck, restarted and it was gone. Any ideas?
Wrench icon
- Thread starter Dennis_H
- Start date
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jkayca
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What year is the truck?
Dennis_H
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Sorry, 2010 XLT. Been running great with no issues. Was about 20 degrees this morning, but it did it after it warmed up and I had driven about 18 miles. Will give it a quick trip at lunch to see if it comes back.
stamp11127
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Depends if your code reader can read the historical codes. The lower end readers only read active codes. You may have to read it when it comes back on.
Dennis_H
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I hadn't turned it off so the wrench icon was still on when I read it. There were no active or pending codes then. It's not a top of the line reader, but does give engine and transmission module codes, live data with TPS info, load, temps, etc. Didn't see anything weird, but I'll watch it.
Dennis_H
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I drove it a couple miles up the road, went through a drive through to get a drink, and came back to work. Ran fine with no indication of any issue. Got up to 60 or so briefly. My scanner does show live data from CAN, and it looked fine now. Any ideas on what to monitor if I see it again?
Did you notice any performance changes on the drive to work?
Dennis_H
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Not really. The indicator came on in a short stretch between red lights, then it is about 1/2 mile to turn in to work. I wasn't pushing it then and when that indicator came on, and after, I probably was a little more cautious looking at gauges, etc.
Maybe it was a fluke, but I don't know where to look yet if it does happen again.
deweysmith
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Did it display a message at all? Did one of your dash lights come on? My red parking brake light came on and the display read "CHECK BRAKE SYSTEM" with a wrench icon popped up briefly during a drive the other day, we talked about it over here.
Dennis_H
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No other indicators. I don't know what caused it, and I'll see if it comes back, but is a little disconcerting to not have any idea why it happened.
stamp11127
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Not a fluke - data from a sensor or sensors was/were out of range then came back into range. At this point could be anything.
deweysmith
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It should have at least set a code somewhere. I would take it to AutoZone/Advance/O'Reilly/whoever else and have them scan it. They have fancy (expensive) Bosch scanners that should be able to read codes from every module. They could look at historic codes and see if there's anything there.
Dennis_H
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I'll see if I can get in to my mechanic, but it won't be till Monday now. Won't be driving it much this weekend, so hopefully the historic codes will still be there. There was nothing in my freeze frame screen on mine, but I don't think it threw a code that stores it there.
chuck s
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deweysmith
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Typically historical codes stay for 50 ignition cycles so they should be there still
Dennis_H
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I had it scanned today and there was an error in the historical data.
U0109 Lost Communication with Fuel Pump Control Module (FPCM)
I have driven about 70 miles since it happened and have noticed no issues. Don't know if that set the wrench icon briefly or not, but had no other errors reported... Will keep watching, but so far, it was a weird 1 time occurrence.
U0109 Lost Communication with Fuel Pump Control Module (FPCM)
I have driven about 70 miles since it happened and have noticed no issues. Don't know if that set the wrench icon briefly or not, but had no other errors reported... Will keep watching, but so far, it was a weird 1 time occurrence.
deweysmith
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I’m sure it did. Here’s the code description from ALLDATA.
Basically, the FPCM expects a modulated signal from the fuel pump to monitor expected fuel pressure, and it hadn’t gotten that signal for a few seconds, so it set the code. Once the signal resumed, the icon probably disappeared.
A short in the wire, corrosion on the wire harness, it could have been a number of things.
The FPCM is decently accessible, I think. Its connector is near the rear left wheel well, I’m not sure if it’s above the fuel tank or on the side. Personally, I wouldn’t worry about inspecting it. I don’t see this as a sign of impending failure or anything.
Basically, the FPCM expects a modulated signal from the fuel pump to monitor expected fuel pressure, and it hadn’t gotten that signal for a few seconds, so it set the code. Once the signal resumed, the icon probably disappeared.
A short in the wire, corrosion on the wire harness, it could have been a number of things.
The FPCM is decently accessible, I think. Its connector is near the rear left wheel well, I’m not sure if it’s above the fuel tank or on the side. Personally, I wouldn’t worry about inspecting it. I don’t see this as a sign of impending failure or anything.
chuck s
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My '07 5.4V8 fuel pump had some short of short in 2016 and the truck just rolled to a stop on the interstate one winter evening. 30 minutes sitting on the shoulder waiting for a tow I tried a restart and it did. Crapped out two or three more times getting to my house. Felt just like hitting the rev limiter on another car. All gauges were in the green. New fuel pump (after a tow to the dealer) got it fixed.
-- Chuck
-- Chuck
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