P1870

PI01880A: No TCC Apply , MIL On , TCC Surge , Possible P0740 , P1870 , or 39 after Installation of Reman ( SRTA ) 4T60 / 4T60E - kw case cover converter slip transmission - (Mar 18, 2004)

Subject: No TCC Apply, MIL On, TCC Surge, Possible P0740, P1870, or 39 after Installation of a Reman (SRTA) 4T60/4T60E.

Condition/Concern

Vehicle model years 1985 through 1999 remanufactured (SRTA) 4T60 and 4T60E transmissions build between 8/03 and 12/03 (Julian dates 3215 through 3337) may exhibit no or very little TCC apply, slipping TCC or possibly setting DTC P0740, P1870 or 39 immediately after installation.

Recommendations/Instructions

Dealer is to inspect the channel plate sleeve for being mispositioned. The channel plate sleeve tcc feed passage should line up with the channel plate passage. If the passages are not aligned the dealer is to replace the channel plate and if the torque converter shows signs of overheating (torque converter body discolored) also replace the torque converter. This channel plate sleeve is located in the channel plate where the oil pump drive shaft passes through and thrust washer item #514 rests against.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.