4T65E DTC P1811 Maximum adapt and long shift

 

Chevrolet: Impala, Lumina, Uplander (2000-2010)

Pontiac: Bonneville, Grand Prix, Aztec, G6, Montana (1997-2010)

Buick: Allure, Century, Lacrosse, Lesabre, Park Ave, Rainer, Rendezvous (1997-2009)

 

Volvo: S80 (1999-2002)

A common misconception about this code is that it is cause by a bad epc (electronic pressure control) solenoid. The dealerships often replace the epc solenoid to get rid of this code because a new epc will increase the resistance value an additional 5 ohms which fools the pcm (powertrain control module) and it can no longer pick up the failure. This code is actually caused by excessive end play in the 2nd gear drum. Once the pcm commands a shift from 1st to 2nd gear the extra play will cause an intermittent hard shift. Replacing the epc will keep the pcm from seeing the problem, but you will still be able to feel the malfunction. The only true fix is to remove the transmission from the vehicle and update the 2nd gear drum. When I say “update” I am referring to replacing the 2nd gear frictions, pistons, and exchanging the steels for a slightly thicker style. After this update it implemented then this code can never be reproduced by the pcm, even after excessive wear and tear.

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