Question about 2003 Chevrolet Impala

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Just wondering what is: P1811 Maximum Adapt And Long Shift

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The transmission 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 0.65 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
The 1-2, 2-3 or 3-4 shift is longer than 0.65 seconds, twice in one trip.
Ask the customer about possible overloading, exceeding the trailer towing limit, or towing in overdrive.

Ensure that the current PCM calibration is correct for the final drive ratio.

  1. Use the scan tool snapshot mode in order to record the shift times.
  2. Drive the vehicle in D4 in order to obtain a 1-2, 2-3 and 3-4 upshift.
  3. Record the shift times.
Did all the shift times exceed the specified value?
0.65 seconds
Perform the Line Pressure Check Procedure.
Refer to the Line Pressure Check .
Is the line pressure within specifications?
Go to Diagnostic Aids
You may want to take this to the dealer !

Posted on Apr 20, 2015


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Transmission code p1811

P1811....Long shift and maximum adaptation limit reached
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Seal cut, clutch worn out. and so on overhaul trans.
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