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I honestly can't seem to make any sense off of this. In my mind this bunk goes out with the trash.

NIce!

Retrieve DTCs and make sure that you are not getting one of those DTC 21 or DTC 22. TPS low or high voltage.

Just what is the EPC?

The Detroit 6.2 and 6.5 diesel engines were never meant to be tuned because they were inexpensive high compression engines that was churned out by the factory by the thousands. When you do you run the risk of not only head gaskets but everything else like destroying the crankshaft mains in the...

Its all to common to see another 4L80-E transmission die off when they can last longer. They.were at the time were one of the strongest transmissions built for light truck duty. Other than the low/reverse band there were no bands to wear out or adjust and it's computer controlled. If you have a...

TPS is the best place to start. Proper adjustment using a test block gage .646.

You are right. No voltage means highest line pressure. The TCM controls that function through variable width to the force motor pressure control solenoid. Higher voltage means less pressure to the clutches. Think of it as a safety mechanism to prevent clutch slippage. Now find out why the...

Doug There is a reason why your transmission is shifting as hard as it is. The computer might be doing it to protect the clutches.

Doug It is really good to hear from you again. I hope that all is well with you. I have a new addition to the family. I have been wracking my brain on how to stuff a 6.6 Duramax in it. They say that all things are possible but I don't know.

I am new to your forum but not new to maintenance. I am glad to come on board.

It probably would be more practical to start the truck, put it into drive and increase the RPM to about 1200 with brake modulation and let the torque converter heat up the transmission and continuing to do it until you see the temperature increase.

Solenoid B stuck in off position. I believe that this could mean that the solenoid will not actuate. I cannot remember how the TCM computer finds this information but I can lead you in the right ball park. If its an electrical problem chances are you can find the problem yourself. Its been a...

Reflashes are common and commonly done at the dealer. I would recommend just the dealer. Yes you can adjust the shift points however talk to the dealer about it. As quoted from Buddy. I can definitely vouch for what he is saying.

+1 Additives are completely necessary. A multibillion dollar business.

Agreed. Agreed again. This pressure adjustment we are talking about is sometimes referred as governed pressure because of vehicle speed as the vehicle speed is sensed. The Throttle position sensor sends TP signal to the computer. The pressure adjusted at the PCS solenoid is not...

Good information ferminator.

Pressure test that dammm transmission. There is a pressure port on the driver's side. Run a fitting, line and pressure gauge. Make the line long enough so you can see it while driving. There should be around 85-100 in the forward ranges. The reverse will be higher. If the pressure...

Those ABS sensors actually work this way. They have a magnet and create their own current. There are two leads. Sometimes you will find that one of the sensor wires (leads) will scrape or suffer road damage/debris. If one of those (fragile) leads take a beating the ABS will light up...

+1 To the ferminator