Is 4L80E computer controlled?
Is 4L80E computer controlled?
All 4L80E transmission use electronic controls; typically from the Powertrain Control Module. Some vehicles have shift maps that are selectable by the driver based on usage, such as towing.
Does a 4L80E have a thermostat?
It does not control a thermostat – there is none. Some aftermarket coolers have their own thermostat for that purpose.
Why do I have bad shifting on my 4L80E?
In addition to erratic shifting, the trans control program will default to backup shifting mode if you drive it long enough with this bad sensor, and as a result line pressure through the valve body will be boosted to maximum value, creating harsh shifting.
What do you need to know about GM 4L80E transmission?
Because the 4L80 transmissions are sometimes used in conversion applications with earlier, non-PCM controlled engines, GM and aftermarket control modules are required and used to control the operation of the transmission in these scenarios. The 4L80E transmission may feature two speed sensors, one for turbine input speed and one for output speed.
What kind of transmission controller does US shift use?
US Shift Electronic Transmission Control Systems let you take charge of your 6R80, 4R70W, E4OD, 4R100, 4L60E, or 4L80E transmission and unlock its true potential. Our transmission controllers are compact, packed with features, and have a built-in display for tuning as well as user-friendly software for more in-depth tuning.
When did the GMC 4L85 transmission come out?
The 4L85 transmission was introduced in 2002. Some of the differences included a 5-pinion output gearset and 5-pinion reaction gearset. Though not a transmission development change, in 2006 GM specified a new transmission fluid formulation and required its use (for warranty) in the 4L80 series.
Because the 4L80 transmissions are sometimes used in conversion applications with earlier, non-PCM controlled engines, GM and aftermarket control modules are required and used to control the operation of the transmission in these scenarios. The 4L80E transmission may feature two speed sensors, one for turbine input speed and one for output speed.
In addition to erratic shifting, the trans control program will default to backup shifting mode if you drive it long enough with this bad sensor, and as a result line pressure through the valve body will be boosted to maximum value, creating harsh shifting.
The 4L85 transmission was introduced in 2002. Some of the differences included a 5-pinion output gearset and 5-pinion reaction gearset. Though not a transmission development change, in 2006 GM specified a new transmission fluid formulation and required its use (for warranty) in the 4L80 series.
What causes OD on a 4L80 diesel?
Since your transmission has 200Ks on it the problem is likely that the valve sleeve bore has worn. When the Torque converter Solenoid strokes the piston the transmission fluid leaks past when hot. The hydraulic signal get so weak that it will no longer activate the control valve within the pump thus kicking in OD.
