Anti-theft Immobilizer problems
Anti-theft Immobilizer: Security system that prevents the car from starting if the ignition key is not the correct one.
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What is the immobilizer on an E-250? Why does it fail?
Related problems:
See owner's manual
Top problems
No communication with pcm,abs,trailer control module,TCM, and no start 
Solved
Ford E-250 2010 5.4 litre 135000 miles
Anti theft light flashing rapidly and gauges flicker once in awhile. Found some melted wires for the trailer control module and repaired but still can't communicate with all this modules. It has u0100, u0155 and some other u codes.
1 reply
Best answer (according to MBrown)
MB
Communication wires at the brake control mudule relay was melted together at the brake controller relay.
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