Ford Mustang Forum banner

2005 GT 4.6 pcm/wiring? Issues please help!

741 Views 1 Reply 2 Participants Last post by  Cobrajet67
Okay I bought a 05 roush 5 speed 4.6 about 2 maybe 3 weeks ago not it was wrecked in the front in of course one of the first things I fixed everything else seemed amazing other then a fan not wanting to kick on but heck that’s fixed now too anywho it’s back to normal other then some paint work but I drove it to work for about a week it’s a new car so I didn’t want to get in it or anything to hard but one time so it drove wonderful I was starting to fall in love with the car then one Friday afternoon it went to fail safe mode and wouldn’t start easy and when it did it was real choppy the dead I replaced the Trottle body so it stays started now but still goes in safe mode after so long I’ve checked plugs cleans plugs I’ve checked almost 85% of the wiring I’m at a lost again I can start and drive but no telling how far and how long and I half to use a $800 dollar code readers to clear the codes to get it back out of safe mode

PPLEASE HELP IF IT WAS A 99-04 neweadge I would have it under control.
Bicycle tire Automotive tire Tread Tire Bicycle part
Vehicle Car Hood Automotive lighting Automotive tire
Product Communication Device Gadget Portable communications device Telephony
Font Electric blue Automotive lighting Display device Automotive exterior
Font Sky Display device Gadget Electric blue
Wheel Car Land vehicle Tire Vehicle
Fixture Gas Electric blue Font Motor vehicle
Fluid Communication Device Gadget Font Audio equipment
Car Tire Automotive parking light Vehicle Grille
Car Plant Grille Automotive lighting Automotive tire
See less See more
1 - 2 of 2 Posts
Punctuation maaaan... I mean really, there's going to be a lot of people on here that won't even respond to a post with a complete lack of any punctuation like yours.

Without even looking up these codes I can tell that most are rare and unusual. This points to a basic electrical problem as the source. Bad power or ground issues will cause multiple unusual codes to come up.

I would check the battery voltage after sitting for a day. It should be 12.5v-12.7v.
When the car is running the alternator should be putting out 13.5v-14.5v on the back charging post.
  • Check the ground at the block for a good connection and all other ground straps.
  • Check the battery terminals and clamps for corrosion.
  • Check the battery cables for damage, splits in the insulation where corrosion may have eaten thru, or exposed/frayed wire strands.
  • Like
Reactions: 1
1 - 2 of 2 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.