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DTC P1623: Code Word Or Key Id Read/Write Error In Pcm: Testing

NOTE: Record freeze frame data. Check for service bulletins and on-line information.
  1. Using scan tool, clear all DTCs. Turn ignition off. Start engine. Recheck DTCs. If same DTC is present, replace PCM and go to next step. PCM is mounted to passenger floor, behind glove box. Perform reprogram procedure. See PROGRAMMING in SECURITY & LOCKS article in ACCESSORIES & EQUIPMENT. If same DTC is not present, go to next step.
  2. Perform after repair procedure. See AFTER REPAIR PROCEDURE  . If DTC is not present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
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