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My adult daughter's '15 XLT started going into limp mode a few days ago. She says when she or the kids are driving and it goes into limp mode, if they shut if off and restart it, it will do ok. Sometimes for long periods, occasionally in short order. I scanned it last night and the only code showing was P0420 which said something about the catalyst percentage on circuit 2. I cleared the code and told my daughter it may be a clogged catalytic converter problem, but not sure. After I cleared the code, it hasn't come back on but the truck has gone into limp mode a couple of times between last night and this morning. When I talked to my diesel mechanic just now, he said he doesn't think it's the cats, and that it might be a timing problem. He said if it were the converters it wouldn't clear the limp mode by just shutting if off and restarting. So now I'm scratching my head and don't know which direction to go.
I will add that this is her and my 3 teenage kids only form of transportation right now, and she's a single mom/working nurse and one grandson works. I'm presently working on his car after he ran off the road, and the Grand Prix the other two kids use is getting the transmission rebuilt, so they're all depending on the Expedition for everything, so this is urgent. Any ideas, comments or experience with this type of problem would sure help me decide on what the next step should be. Thanks in advance for any help. Lee
I will add that this is her and my 3 teenage kids only form of transportation right now, and she's a single mom/working nurse and one grandson works. I'm presently working on his car after he ran off the road, and the Grand Prix the other two kids use is getting the transmission rebuilt, so they're all depending on the Expedition for everything, so this is urgent. Any ideas, comments or experience with this type of problem would sure help me decide on what the next step should be. Thanks in advance for any help. Lee
