1122union

I am stumped. If I drive in D3 at about 30mph for about 4 miles, the cel will come on (2007 Civic EX). A little after that, the car will go in limp home mode. If I stop the car, switch it off and back on, the light goes out and there is no more problem. When I check for codes, there aren't any.

The same thing will happen if I have it in Drive and travel about 25 miles at 75.

Thanks

RK

97emsedan

That's a curious problem. When you started the description I thought it might be your TPS relay or the sensor itself. That would throw the car into limp mode as it did for mine. I am getting the TPS relay replaced. Speed related limp modes are not my strong suit but I would venture to say your transmission control module or a speed sensor might be to blame.

1122union

Update. Still have CEL and limp home mode but this time I have codes. The codes are, Po301, 302, 303, 304 and 300. All I have to do to get the CEL to turn off is to turn off the engine and turn it back on. The codes seem to say that I have a miss on all cyl. However, I do not feel a miss.

Any help would be appreciated.

tech8

What is the approximate mileage on the car? Has the spark plugs ever been changed?

DaveSi677

hmmm kinda curious... like tech8 mentioned what is the mileage and have the spark plugs been changed?

1122union

The plugs and coils were replaced 6 thousand miles ago and the milage is 190K.