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P1811 is a transmission code for trans adapt long shift. There is a service bulletin for this code that recommends replacement of the pressure control solenoid in the transmission.
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Did you clean the cooler lines? 200 is to hot. 1811. Pull the side cover of the transmission and replace the EPC solenoid and both shift solenoids. Watch the check balls. Make sure they go back where they came from. After this you have to reset shift adapts. Takes a scanner.
Your PCM has the means to adjust shift pressures and timing to make all the shifts smooth but properly timed. This code means that the computer cannot adjust any more because of an issue. This could be a pressure control issue or possibly a leak at a clutch seal. I would talk to a reputable transmission shop and see what they have to say. Chances are that you will need transmission repairs.
B 1811. Open in driver side squib, 2nd step circuit.
The driver's side seat belt circuit is open. Remove the driver's side pillar cover, and look at the connector attached to the reel. Clean it with contact cleaner and place it back. If it does not solve the problem check the harness wiring for damage or broken wire.
Four digit codes are brand specific, for GM products the code is for a problem with the transmission control module. The time between shifts may be too long. You would need a factory shop manual to get the testing procedures for the code.
Hi there: 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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The 2 aren't connected to each other. Tranny flushes are NEVER good. Have it checked for codes. Code 1811 (EPC) VERY common in those trannys cause hard shifts.
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