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2002 Chevy Silverado 2500 transmission issue, HELP!

2002 Chevy Silverado 2500 transmission issue, HELP!

Postby Bowhunter111911 [OP] » Apr 22 2013, 11:12pm

Hey guys I am new here and I have got a problem that is driving me insane. My transmission on will not stay in overdrive. Sometimes it works fine like it should and other times it will kick out, going down the road at 55-60mph everything is fine and im happily crusing at around 1800 rpm and then all of a sudden it will kick out of OD and stay like that for 5-10 miles or so then drop back in back and fourth back and fourth until I get where I am going. Some days its fine and will only do it once others it does it 3-5 times depending on how far I drive. I brought it in and they said it was my break control switch, I replaced that and no fix. I am almost sure it is an electrical issue because it doesnt malfunction all the time and when its not doing it the tranny works like a champ. Any input would be great!
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Re: 2002 Chevy Silverado 2500 transmission issue, HELP!

Postby masterem88 » Apr 30 2013, 3:18am

Is it overdrive or the torque converter unlocking? Is it like 3-400 rpm change or like 1000 rpm change. And you really need to get a shop to watch it on a scanner to see if its being commanded out of overdrive or lockup or if its doing it unwanted. Tps, vehicle speed sensor, coolant temp, trans temp, internal trans problems, just to name a few can cause this depending on if its overdrive or actually lock up changing,sensors need to be graphed out to see these minor spikes in voltage that are common to cause this. Especially tps and vehicle speed sensors. Any in and out of overdrive or lockup get my full blown diagnosis to cover it all if nothing stands out from normal test drive and scan. Whats fluid condition look like? Any recent wort done besides the brake switch? And a bad brake switch can cause lockup to dissengage but not overdrive so you know.... theres a big difference between the two and two completely different diagnosing strategies. So let us know which one it is.
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Re: 2002 Chevy Silverado 2500 transmission issue, HELP!

Postby Bowhunter111911 [OP] » Apr 30 2013, 3:44am

Its the 3-400 rpm change. I dont know what the difference would be if it unlocks or kicks out of over drive. when it does it if I hit the gas hard it will grab passing gear but then still will not drop into overdrive. Just yesterday in 100 miles it did it twice for about 5 miles total.
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Bowhunter111911
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Posts: 2
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Joined: Apr 22 2013, 11:04pm
Years of membership: 1 year of membership
Year: 2002
Make/Model: Chevrolet Silverado
Extra Info: 2500 6.0L
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Re: 2002 Chevy Silverado 2500 transmission issue, HELP!

Postby masterem88 » Apr 30 2013, 4:16am

Lock up is not a gear like overdrive is. Lock up is part of the torque converter. Its easiest for you to learn about it on youtube with a video rather than me typing it all
-ASE Master Automobile Tech- Associates Degree in Automotive Technology
-Russ Moore Transmission Specialists
-Northeast Allen County Fire Department
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Combustion on 4 pistons [L2]
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Joined: Oct 06 2012, 10:47pm
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Location: fort wayne, IN
Year: 2000
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Extra Info: K1500 Z71 5.3L
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Re: 2002 Chevy Silverado 2500 transmission issue, HELP!

Postby gear.man.tex » May 18 2013, 5:43am

IM FIGHTING A SIMILAR ISSUE, my research has lead me to map sensor without a code or chk eng light, the map sensor does the same thing as the old days modulator valve beside keep proper a/f ratio for the engine, or is it the tps, throttle pos sensor? like the old 700 r4 had a cable it gets the tps data instead, ive got a v10 dodge doing that too and id like to know, my 1500 chev, my mothers old buick with 3800 i think wasnt kicking out torque conv lock when supposed to, IM TRYING TO FIGURE OUT LOCKUP! let me know of you findings please so i can help lots of people with our same problems
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