Diagnostic Aids
When fault is present, PCM assumes the D3 position until a correct combination is received by PCM. Until then, some gear select positions may not be possible until fault is cleared (repaired). Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wire connections or damaged harness.
Perform intermittent check by monitoring circuit and code status while wiggling related wiring and connectors. If failure is induced, monitored circuit status will change rapidly and/or related code will set.