2000 Buick Century transmission code p1811 max adapt & long shift. P1404 egr valve.

We changed fluid and filter. Ihave the following codes. What do they mean?  P1811 max adapt &
long shift.   
P1404 egr  p0742 tcc stuck on.

Answer: Could you tell me if these codes all came at the same time? Have they ever been
cleared, and then driven to see which code comes back first. I will wait for your reply and give you
some info. Thanks.

VISITOR:
Yes they were all read at the same time..I was told to change the trans,filter as soon as i could
and i did.I have not done or read any
codes since..I'm not equipped to do so without taking it to a
garage.I need to know what i have to get and do..Your welcome for the donation..Jerry.


Answer:
Well, the egr code p1404 is for closed position performance. The computer(PCM) does not see the
egr go to a fully closed position. 2 possibilities. The egr is bad or full of carbon and cannot close all
the way. Remove and cleaning sometimes can help, but not always. There also may be a pcm
re-programming for this code. A re-calibration of a false code setting. A re-programming adjusts
what the pcm want s to see. Only way to check that is to have the dealer scanner hooked up and
check for updates.

The p1811- max adapts and long shifts. The pcm is seeing a longer than normal up shift time, and
tries to compensate by raising line pressure. It can only do this to a point. When it can no longer
compensate, and the shifts are still too long, this code sets. Several things can cause this. Actual
internal
transmission component slipping, problem in the trans. Pressure control solenoid or valve
body. A Technician would have to hook up a pressure gauge and look at live transmission data to
determine this.

The p0742-tcc stuck on is usually a tcc solenoid or valve body problem. Either a failed solenoid,
stuck solenoid because of debre in the valve or valve body. Which brings me back to the p1811.
Any debre in the valve body can cause problems with either of these solenoids. If either solenoid
has come apart, small pieces of the solenoid would be in the valve body, and cause a problem with
other valves. As with the p1811, worst case is that the trans needs an overhaul. I know that is not
what you want to hear, but it is a possibility, especially if the old fluid was burned. This would have
to be properly diagnosed by a transmissionTech. Not something that can be fixed in your garage.
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2000 Buick Century Transmission Code P1811