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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P1811: Maximum Adapt & Long Shift >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The transmission fluid pressure is modified by an adaptive modifier which controls the shift execution time. This diagnostic tests the time required to accomplish the shift. If the shift takes longer than .65 seconds and the adaptive modifier cannot shorten this time, then a counter increases by one.

If the PCM detects a counter value of "2" during one trip, then DTC P1811 sets. DTC P1811 is a type "C" DTC.

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