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All codes are clear, code 63 was triggered by a little bit of transmission fluid in the Transmission Connector. Cleaned out and shifting with no issues. Still working on the transmission light being on. Funny thing is, when its off and you hit the breaks... the transmission light gets brighter...

I’m going to take it for a test drive tomorrow. To see if it now shifts correctly. Only code I have is a Code 63 from the transmission flashing light. Other than the normal start 12 and end 12 flash. I’ll check the connections on the ignition switch. Still using the factory ones.

Has anyone come across fault code 63 for the 4L80e transmission?

Found the wire for the 12v side on the rear battery was connected to the forward battery. Swapped and the over voltage code cleared. Now I have codes 63 and 83. Has anyone seen this code 63? I cannot find it in the manual, and I triple checked it flashed code 63 as well. The lamp indicator dims...

Yeh its strange that it comes on when the ignition is off. So comes on when it goes to run, when I'm waiting for the glow plugs to warm up, turns off when running, and turns back on when I switch the ignition off. It will only stay off when I turn the batteries to off (installed a battery...

Anyone know of any Mechanics or shops that can work on HMMWV's? -Giuseppe-

W What type of rim did you end up going with for the 17" rims? I live up in NH and I'm looking to do this for the winter time.

Has anyone dealt with a DTC 53 code? The transmission warning light comes on when vehicle is on run to warm up glow plugs. Goes away when it is running (Still stuck in 2nd gear) and comes back on when the ignition is switched to engine off. I was not sure if there was something that is a typical...

Hello, received my HMMWV about 5 months ago. She is a 1993 M1025 A2 GMV. Has been fun to say the least getting her ready for the road. I’ll be searching around the forums and probably asking questions on some issues I have. Mainly on the transmission. As the light only comes on when I start...