If your experiencing erratic shift behavior, unpredictable converter lockup or scan tool connectivity issues, there's a chance your TCM is faulty. Replace it with this Genuine USED Allison transmission control module (TCM) from DHD. TCM's are blank and will require re-flashing.
2001-2005 Duramax with Allison LCT1000. 2500HD/3500HD. 2WD & 4WD
To help us insure inventory levels and keep the cost low, a $75 refundable core charge will be applied to your order during checkout. Cores must be free of banjo thread defects, broken connectors bodies, bent pins, and match the model you ordered. In the event you'd like to avoid the core charge, please check the box "Return Core First". This will hold your order until your core is received.