C 1500 Suburban 2WD V8-393 6.5L DSL Turbo VIN S (1996)
5. If the PCM fails to reprogram, do the following:
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Check all of the PCM connections.
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Check the Techline terminal/equipment for the latest software version.
^
Try again to reprogram the PCM. If the reprogramming fails again, replace the PCM. Refer to PCM replacement.