DTC 50

DTC 50 (P1638): Motor Control Module (MCM) Internal Circuit Problem
1. Reset the MCM.
2. Turn the ignition switch ON (II).
Is DTC 50 indicated?
YES-Substitute a known-good MCM and recheck. If the symptom/indication goes away, replace the original MCM.
NO-intermittent failure, system is OK at this time.