70 has somthing to do with the trans...but is very generic also the D4 light should flash since it's a trans problem, to get a the true code that will narrow down the problem your going to need a scanner your local autozone is a good place for a free code read. as honda's factory codes tends to telll you the ares of the problem but the sae (P-code) will narrow down your search butmostlikely it's a tranny problem .