Anti-theft Immobilizer problems

Anti-theft Immobilizer: Security system that prevents the car from starting if the ignition key is not the correct one.

What is the immobilizer on a Mustang? Why does it fail?

Top problems

Anti theft activated/series of dashes

Ford Mustang 2001 convertible , 4.6 250ci fuel injectors 199999 miles

I noticed when I did the ccrm swap because my cuztomer was concern over the crank no start condition. Ended up finding out the pink an black wire that runs from inertia cuttoff switch to the fdpm was an open circuit for what ever reason. I did the repair swapping it out for a new harness. Can anyone help me out its been headache for a rookie :(

JAYPEE5800blk from United States 7 months ago

Comment

Same issue here

1 report

Turn the key and it won't turn over ( changed battery )

Ford Mustang 2006 4.0 186000 miles

I pulled the old battery off for about 5 day's. Replaced with a newer one, and my issue is it won't turn over ,When I turn the key on all the lights on dash is on including theft light I checked connections and tested relays and checked every fuse. Still won't crank. In leaning towards anti-theft or safety switch in the shifter. Any in put would be a great help. It's a 2006 v6 mustang.

Popeye337 from United States a year ago

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Same issue here

5 reports

Moparman from United States a year ago

I have a 2014 3.7 v6

Same issue with 6000plus I changed starter relays and fuses. Associated. Im trying the diode to pump fuse needed to order one from ford parts counter. 4 bucks for the fuse if this dont work idk. It seems like this issue isnt easy or straight forward thing. Ford said it could be, 1. Pcm 2. Wiring 3. Bad battery 4. Starter relay 5. Blown fuses 6. Starter motor 7. Transmission 8. ABS module. That's a lot of could be problems. They were so excited when I asked the cost of all those items if they were to do them with labor its ridiculous. I spent money on issues they said and im already close to a grand.