This is exactly what happened. I have a 98 prelude. The car has been running just fine. The other day I was backing out of my driveway and rubbed pretty hard on some stones. About 15 minutes later my check engine light came on. I checked the code and it is code 70 automatic transaxle. The car is also not hitting v-tec where it should be now. It hits it about 6300 rpms and is kind of hesitant. Does anyone know what could be doing this? PLEASE HELP..... You can post or email me at archer806@verizon.net. Thanks.....

 

the ecu will go into "limp mode" with some cel's to protect the engine. You shouldn't be vtec-ing until you fix the problem.