The 4L80-E is a codename for automatic transmissions from the General Motors (GM) designed for longitudinal engine setup. It was a 4-speed automatic transmission used in various GM cars (especially Chevrolet and GMC SUVs/trucks) and in a few models of Rolls Royce and Bentley.
There are few reliable transmissions that can handle vehicles with high horsepower. 4L80-E is one such transmission. However, these transmissions can face a few problems at times and many people have faced issues regarding this transmission. The most common issue is that it does not move in any gear. We will address this issue here so that you can fix it without wasting too much money.
A few of the common reasons why the 4L80-E transmission won’t move in any gear are as follows:
- Pump failure
- Leakage of transmission fluid
- Excess transmission fluid
- Incorrect installation of Torque Converter
Some important FAQs:
1) Why does the 4L60-E transmission won’t move in any gear when hot?
When the engine and transmission become hot, it is important that the transmission fluid is filled in the appropriate quantity so that it remains cool and allows the transmission to work efficiently.
- If you face issues when the transmission is hot, there might be either a leak or the transmission fluid is burnt.
- When the gears work with a low level of transmission fluid or burnt fluid, there might be wear and tear in the gear system which might result in gear slippage and hence cause the gear not to shift.
- In some cars, an issue called dragging clutch occurs when the transmission gets hot. In this, the clutch disk is not able to separate from the flywheel due to which changing the gears does not work. You may have to get the transmission cable adjusted by a mechanic.
Solution: If there is a leak, fix it and then change the transmission oil to the appropriate level and
you are good to go.
2) What are the electrical problems that the 4L80-E transmission face?
The easiest way to determine the electrical problems in these transmissions is to run an OBD scanner by attaching it simply to the port present under the dashboard area. A thorough scan by an OBD scanner will determine:
- If any electronic sensors are faulty
- If other electrical parts are damaged
Solution: Replace the faulty sensors and electrical parts with the new ones.
3) Why does my 4L80-E show no line pressure?
Correct line pressure is required so that the gears do not slip and they shift swiftly.
A few common reasons due to why 4L80-E shows no line pressure are:
- Low transmission fluid
- Clogged filter
- Pump leak
- Faulty pressure regulator
- Worn oil pump
Solution: Check the level of transmission fluid and fill it to the required level, clean/change the filter.
If the issue still persists, check if the pressure regulator is fine, and fix/replace the pressure regulator if it is faulty.
4) What are the symptoms of a clogged filter of a 4L80-E transmission?
A clogged filter can be detrimental to the working of a 4L80-E. A few signs by which you can tell that you have a clogged filter are:
- Wear and tear of several internal components of the transmission such as seals, gaskets, bearings, etc.
- An unusual noise when the gearbox is in neutral mode.
- A burning smell
- Hard gear changes
Solution: Firstly, clean/change the filter, then, check and fix any leaks. If the issue still persists, check
the transmission fluid if it is burnt, then change it.
5) What are the speed sensor problems with 4L80-E transmission?
People have encountered speed sensor issues with their 4L80-E transmission. The speedometer shows incorrect speeds, the first thing you should check is the speed sensor. If replacing the speed sensor solves the issue, you are good to go. We recommend you get an inspection done by a mechanic and you should be fine.
Solution: This might be due to a faulty speed sensor. You should replace the speed sensor and you
should be good to go.
It is well-known that the GM products are reliable and built to last, and the 4L80-E transmission is no different. Its behavior of not shifting into gears is observed fairly consistently but we have cracked the solution for this problem. If you face any issues with it, there are often cheaper ways to fix them. These repairs will empty your pockets rapidly if you leave the vehicle in a garage for the repair. If you do a little bit of research and refer to this article for the issues, you might find a cheaper and simpler way to fix the issues.