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6.5L Turbo Diesel 1992-00 6.5L Turbo Diesel - Welcome to the Internet's first discussion forum for the 6.5L diesel engine. Tips on performance, upgrades, cooling, fuel economy, troubleshooting and more.

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  #11  
Old 02-11-2019, 08:37 AM
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What 56 pan said.

No codes or SES could certainly point to the switch.

Have you actually tried pulling the shift lever into 3rd when it does its thing ??

Dropping out of lockup will give the feeling that it's out of 4th gear as most of the 6.5 rigs hit lockup at 45 mph and it is a very firm shift and when the lockup is unlocked there is not much difference in feel between 3 and 4...


When it does it's thing try manually shifting to 3rd and see if the RPM go up.

If this is the case, then its the lockup and likely the stop light switch.
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  #12  
Old 02-11-2019, 08:41 AM
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I never owned a truck with a mechanical pump an an automatic transmission, but I'm pretty sure you can check for codes by putting a jumper (paperclip) in the DTC socket. There's an article on the member's section of the web site that discusses how to do it on a 94-95 model year.

Yeah, the ignition switch... There's a separate set of contacts that powers the instruments and the trans. If you have issues with the tach as well, Bob's your uncle... You can check the voltage on the instrument fuse to see if that's what's happening.
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  #13  
Old 02-11-2019, 09:07 AM
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92 and 93 had a tranny control module

Too bad GM did not stick with the mechanical injection...would have saved many of us a lot of excess pain and suffering. for sure...
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  #14  
Old 02-11-2019, 10:38 AM
Yukon6.2 Yukon6.2 is offline
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Quote:
Originally Posted by mikeyg1975 View Post
I thought about that, I'm going to get a scan tool and see if it's throwing any codes, and with TPS sensors being cheap and plentiful, maybe I'll throw one on there and see what happens.

Hi No codes were thrown on his truck...
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  #15  
Old 02-12-2019, 07:17 AM
56pan 56pan is offline
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Quote:
Originally Posted by Robyn View Post
92 and 93 had a tranny control module

Too bad GM did not stick with the mechanical injection...would have saved many of us a lot of excess pain and suffering. for sure...
Total agreement with the 2nd sentence.
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  #16  
Old 02-13-2019, 03:08 PM
Kennedy Kennedy is offline
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Quote:
Originally Posted by 56pan View Post
My '93 C2500 6.5 diesel did the exact same thing. Only has a TCM and stored no codes. It was a bad ignition switch. Badly worn and with green corrosion. The clue is shutting it off, restarting, and the trans works right again. Hope this helps.

Start with this ^^^

Those trucks of that era had poor switches especially when they got some age and miles on them. The trans requires stable voltage to do its electrical pwm thing.
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  #17  
Old 02-19-2019, 07:17 PM
mikeyg1975 mikeyg1975 is offline
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Quote:
Originally Posted by 56pan View Post
My '93 C2500 6.5 diesel did the exact same thing. Only has a TCM and stored no codes. It was a bad ignition switch. Badly worn and with green corrosion. The clue is shutting it off, restarting, and the trans works right again. Hope this helps.
I appreciate everyone's input and the winner goes to 56pan and all others who suggested the ignition switch!! I finally had time to work on it today and changed out the ignition switch with a genuine ACDelco NOS part, just test drove it tonight, works like a champ!! I'm glad I asked y'all because I never would have thought that!!
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  #18  
Old 02-20-2019, 06:36 AM
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Good deal...

Glad you are all fixed.
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  #19  
Old 02-21-2019, 07:20 AM
56pan 56pan is offline
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Quote:
Originally Posted by mikeyg1975 View Post
I appreciate everyone's input and the winner goes to 56pan .......
Even a blind hog gets an acorn every now and then. Glad you're fixed.
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