Lomion5 Posted April 15, 2012 Share Posted April 15, 2012 So here's the story, the CEL was on and the car (an 05) was dropping into limp mode seemingly at random. Now a few grand later I've replaced 2 cats, plugs, wires, and MAF. No more CEL, still dropping into limp mode whenever it feels like it though. Sometimes I can dive a few hundred miles before something happens, other times I can only get a few hundred feet. Multiple garages are clueless...thoughts? Today when it happened I was able to just turn it off and let it sit for about a half hour before driving it home without incident. Any ideas are welcome! I'm out of my league here... Link to comment Share on other sites More sharing options...
No DRFT Posted April 15, 2012 Share Posted April 15, 2012 What was the CEL code? I have no control over drippie. Link to comment Share on other sites More sharing options...
Lomion5 Posted April 15, 2012 Author Share Posted April 15, 2012 It was P0420, Catalyst System Efficiency Below Threshold Link to comment Share on other sites More sharing options...
RuskiTrombone Posted April 15, 2012 Share Posted April 15, 2012 Should've done this first. 4 out of 13 cars I've owned had a P0420 code around 80-100k miles. I think it's a way for the manufacturer to make people trade in their cars. http://honda-tech.com/showthread.php?t=1841240 Link to comment Share on other sites More sharing options...
SCASEYS Posted April 15, 2012 Share Posted April 15, 2012 i get random limp mode on occasion too, think mine is TGV related. I just put it in nuetral and turn off and back on. just about every time boost is back. I donated to LegacyGT.com which allows me to have this nifty signature. If anything SCASEYS posts ever becomes a sticky i'm gonna light this whole place on fire Link to comment Share on other sites More sharing options...
bmx045 Posted April 16, 2012 Share Posted April 16, 2012 i don't think the car goes into limp mode(legit limp mode) for a flashing cruise. it simply wont let you use cruise or S#. if it's not accompanied by a CEL it *might* be a BIU issue or a cruise control unit problem.... plug in the white connectors inside your dash fuse panel, turn the key to on position, hit and hold the odometer button while the gauge needles sweep. this will display ALL fault codes with the ecu and BIU. Link to comment Share on other sites More sharing options...
Lomion5 Posted April 17, 2012 Author Share Posted April 17, 2012 Ok, so might be BIU. I'll see if I can check that out. I have also been told other possibilities include throttle body, fuel filter, or oxygen sensor. Do those sound like they could trip limp mode without throwing a code? Link to comment Share on other sites More sharing options...
bmx045 Posted April 17, 2012 Share Posted April 17, 2012 most, if not all, engine problems throw a CEL (check ENGINE light) Link to comment Share on other sites More sharing options...
Lomion5 Posted April 18, 2012 Author Share Posted April 18, 2012 I know right?! So frustrating. I'll do my best to check on the BIU. Link to comment Share on other sites More sharing options...
Lomion5 Posted April 20, 2012 Author Share Posted April 20, 2012 Ok so I have been driving the last few days using only the tiptronic. I haven't gotten the car to limp yet. Looks like this may be a temporary solution, though time will tell. Does this shed any light? or just further complicate things? or really make no difference at all. Link to comment Share on other sites More sharing options...
Lomion5 Posted April 24, 2012 Author Share Posted April 24, 2012 Ok so I made it unitl today using the tiptronic. After quickly decelerating after someone cut me off and the hit their brakes, the car dropped into limp mode. Again, no CEL. Thoughts? Link to comment Share on other sites More sharing options...
bmx045 Posted April 24, 2012 Share Posted April 24, 2012 tranny code Link to comment Share on other sites More sharing options...
SCASEYS Posted April 24, 2012 Share Posted April 24, 2012 tranny avatar I donated to LegacyGT.com which allows me to have this nifty signature. If anything SCASEYS posts ever becomes a sticky i'm gonna light this whole place on fire Link to comment Share on other sites More sharing options...
FJuan Posted April 24, 2012 Share Posted April 24, 2012 Do you notice it going into limp mode after a few WOT runs? Mine went into limp mode after WOT with no CELs. Found out I had faulty spark plugs. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
mwm5094 Posted April 24, 2012 Share Posted April 24, 2012 sounds personal....... Link to comment Share on other sites More sharing options...
Lomion5 Posted April 25, 2012 Author Share Posted April 25, 2012 Transmission place I took it to said the car wasn't throwing any codes, transmission or otherwise, but I imagine SOMETHING has to happen that the computer can see to throw the car into limp mode. Maybe they were just clueless as to what to do with it? As far as WOT runs, I've been pretty timid with the throttle for the most part, afraid that WOT might trip limp mode as you suggest. Plugs and wires have been replaced but hey, plugs are relatively cheap so maybe it would be worth replacing them again? Thanks for the ideas everyone, I'll maybe try to get the tranny checked for codes again... Link to comment Share on other sites More sharing options...
FJuan Posted April 25, 2012 Share Posted April 25, 2012 Replacing the plugs wouldn't hurt. I only had 15k miles on my previous plugs before I started having issues. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
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