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Posted on Jan 02, 2017
SOURCE: code 1811 chevy impala
A common problem with the 4T65E autotransaxle is the pressure control solenoid (PCS) causing the hard shifting and in most cases upshifts only. If this is the case with yours then a scan with a trans capable scan tool may reveal a stored DTC of P1811 (max adapt, long shift) which would confirm the PCS (Pressure Control Solenoid) s suspect.
Checkn in THIS LINK description and test procedure.
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Posted on Aug 17, 2012
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