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[Mac man]

I went to start my truck and nothing......the antitheft/security light was blinking rapidly which the manual states it has a problem and to try the other coded key, I did not have the other key with me so I tried everything else; took it out of Park and put it back in, locked and unlocked the doors with remote and keyless entry still nothing. Tried all of this several times and was ready to give up when I thought, why not tilt the wheel up and down just to try something else and bam it's all good and the truck started.

they thought it was the ignition module, than they thought it was the instrument cluster. They finally found out that it was the PCM (main computer).

2000 Expedition. Dealer changed out the PCM, ECM, climate control unit and cluster. found after extensive going through the whole system. After pulling the wiring harness for the ECM and also the PCM Communication cable found there was no shorts in that but what did find was from the steering column. Down in the column runs the wiring harness that has a ground wire that broke and it was caused by the shifter that's in the column. It took six days to figure out exactly what was happening. traced every wire on that vehicle from under the dash to the motor housing. found that it was a manufacturer defect at time of assembly.