Problem with my 2000 Buick Century transmission.
Year = 2000
Mileage = 111,000
Engine size = 3.1
dash lights = no
codes = p1811 max adapt & long shift. P1404 egr valve
work done to repair = changed fluid and filter.
tip/donation yes
tech = sf
question = I have the following codes. What do they mean? P1811 max
adapt & long shift. P1404 egr p0742 tcc stuck on
Year = 2000
Mileage = 111,000
Engine size = 3.1
dash lights = no
codes = p1811 max adapt & long shift. P1404 egr valve
work done to repair = changed fluid and filter.
tip/donation yes
tech = sf
question = I have the following codes. What do they mean? P1811 max
adapt & long shift. P1404 egr p0742 tcc stuck on
SF:
Thank you for tip/donation.
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, SF
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
SF:
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 upshift
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 trans. component slipping, problem in the trans. pressure
control solenoid or valve body. A trans. technician would have to hook up a pressure gauge
and look at live trans. 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 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 trans.
tech. Not something that can be fixed in your garage.
Thank you for tip/donation.
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, SF
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
SF:
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 upshift
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 trans. component slipping, problem in the trans. pressure
control solenoid or valve body. A trans. technician would have to hook up a pressure gauge
and look at live trans. 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 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 trans.
tech. Not something that can be fixed in your garage.
The exhaust gas recirculation (EGR) system is used to lower oxides of nitrogen (NOx) emission levels caused
by high combustion temperature. It does this by decreasing combustion temperature.
The main element of the system is the EGR valve. The EGR valve feeds small amounts of exhaust gas back
into the combustion chamber. With the fuel/air mixture thus diluted, combustion temperatures are reduced.
If a problem with the EGR system will not allow the PCM to control pintle position properly, DTC P0404 should
set. The PCM also tests for EGR flow. If incorrect flow is detected, DTC P0401 should set. See DTC list for
other EGR codes.
by high combustion temperature. It does this by decreasing combustion temperature.
The main element of the system is the EGR valve. The EGR valve feeds small amounts of exhaust gas back
into the combustion chamber. With the fuel/air mixture thus diluted, combustion temperatures are reduced.
If a problem with the EGR system will not allow the PCM to control pintle position properly, DTC P0404 should
set. The PCM also tests for EGR flow. If incorrect flow is detected, DTC P0401 should set. See DTC list for
other EGR codes.
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