1870 code, TCC rough apply - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-09-2007, 09:14 PM   #1
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Default 1870 code, TCC rough apply

Hey all. I've a 96 Bonnie with 140K on the clock. Since I've owned it (bought it at 100K) it'* had a farly harsh TCC apply. Now, it'* throwing the p1870 code and the TCC is sometimes not coming in at all. I've talked to a tranny guy in my hometown who says theres a possible "fix" with a sleeve kit that can be installed in the valve body. Anybody had experience with this? Advise from any angle would be appreciated. I think the tranny is strong and I've run cars like this to 240K without rebuilding the tranny...can't spend $2200 on a full rebuild right now, but don't want to sink $600-700 in a "fix" if others haven't had success. Please advise!
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Old 08-13-2007, 11:16 AM   #2
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Do you notice that the problem is heat-related? In my '95, whenever the trans fluid got hot, the TCC would not lock-up. In my case, adding a transmission fluid cooler mostly solved the problem. I installed the $40 model from http://www.bulkpart.com and the trans now stays cool enough to shift and lockup normally on all but the hottest days. If I had bought the $60 model, maybe it would work fine even then.

Anyway, even if this does not solve your problem, it will not be money wasted. Keeping your trans fluid cool is probably the best thing you can do to prolong the life of the trans. An added benefit is that the engine runs cooler, too.
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Old 08-13-2007, 11:34 AM   #3
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There is an update for the TCC. It involves a new seat and an updated Solenoid. It prevents erosion of the seat over time, which can result in harsh TCC apply. I have this update in both of my 4T60E'*.
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