4l80e head scratcher.. need help

[Mogman]

ok, but you are wrong, sorry. It is not "in the shifter"

In 4l80es, the NSS is on the driver side of the transmission. It is a large black component with a large electrical connector or several I have owned several, and had similar issues. Limp mode can be enabled with a fault in this switch. Safety thing, go figure.

View attachment 950007

Further @Mogman.........if you know the NSS is not the culprit, then what would solve the OPs issue?

You have owned several on HMMWVs? I have never seen that switch on a HMMWV, but I don't get to play with the latest (ECV/REV) trucks

 

[weaponoffreedom]

but I don't get to play with the latest (ECV/REV) trucks

Well there it is.

Look fella, I am not here to argue or measure dicks with you. OP stated 1999, which would be obd2 era. OP stated module issues. OP stated intermittent......

 

[weaponoffreedom]

I am 100% wrong, yet almost right.

I see you are one of those folks. Again, what knowledge so far has been conveyed to the OP, by you to solve this issue........enough such that you are 100% certain, than my suggestion is shit and clearly wrong?

I also see you are a moderator btw, but the question still stands.

 

[Mogman]

I only want to get the correct information out there to help folks in need.
NO HMMWV ever had an ODB-II, they use the same transmission and TCM configuration that was used on the 6.2L mechanically injected non ECM vehicles before the mid 90s.

Again I ask have you seen that NSS switch on a HMMWV?

And yes I admit when I am wrong.

EDIT, all HMMWVs have mechanical injection like the 6.2L, none have the electronically controlled IP like the civy 6.5L has, this is due to "standardization" which makes maintaining all HMMWVs easier due to having many common parts, and possibly to limit the damage of Nuclear electromagnetic pulse.
This is why none of the HMMWVs have an ECM/PCM therefore no ODB-II only ODB-I in the TCM because it remains a gen 1 TCM throughout production

 

[weaponoffreedom]

I only want to get the correct information out there to help folks in need.
NO HMMWV ever had an ODB-II, they use the same transmission and TCM configuration that was used on the 6.2L mechanically injected non ECM vehicles before the mid 90s.

Again I ask have you seen that NSS switch on a HMMWV?

And yes I admit when I am wrong.

EDIT, all HMMWVs have mechanical injection like the 6.2L, none have the electronically controlled IP like the civy 6.5L has, this is due to "standardization" which makes maintaining all HMMWVs easier due to having many common parts, and possibly to limit the damage of Nuclear electromagnetic pulse.
This is why none of the HMMWVs have an ECM/PCM therefore no ODB-II only ODB-I in the TCM because it remains a gen 1 TCM throughout production

I understand, and respect the good flow of accurate info.

No I am not versed in HMMMVS other than riding in them.........but i am versed in the 4l80e and vehicles it came in, owned dozens.

The e in 4l80e stands for electronic............all other parts electronic were discussed, but that switch....which does allow safe starts, but can also, when not functioning correctly, put into limp mode.

 

[Mogman]

AGAIN what I am trying to say is that the HMMWV does not have that switch so it could not be an issue.
Start the video around 2:00
All HMMWVs use the early style shift shaft because they do not have a NSS mounted to the side.

Again the neutral safety switch in a HMMWV is in the shifter not on the transmission and it has nothing to do with the transmission, it only prevents starting the engine if the SHIFTER is out of position, the safety switch is only between the start switch and the starter solenoid and has no electrical connection to the transmission whatsoever.
I just don't want people that do not know better thinking their problem is because the NSS is missing from the transmission or that the neutral safety switch could cause transmission issues.

 

[Rpaint82]

In transmission hell.... 09 rev 6.5TD 4l80e. Was in limp mode (pressure control solenoid)

Replaced all the internal solenoids, and internal wiring harness with all OEM parts.

Still in limp no change.. Replaced TCM.

Now it shifts through 3rd but will not go into 4TH OD. Transmission light still on saying code 73 pressure control solenoid. Only thing i haven't Replaced is the speed sensors and neutral safety switch. What am I missing??!!