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Overdrive going on and off

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Old 04-07-2018, 04:53 PM
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Default Overdrive going on and off

I have a 2002 dodge 2500 gas truck. I’m having a problem with the overdrive going on and off. The first time it does this is when you tap the brake pedal. I narrowed this issue down to the white and pink wire on the brake light switch. Second if you switch the heater control off and to ac the overdrive goes on and off with that. I’ve narrowed this down to the green and white wire on the heater control. Third when you shift it the overdrive light goes on and off. If you unplug the neutral safety switch this problem goes away. I’ve looked for shorts and can’t seem to find one. Any help will be greatly appreciated
 
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Old 04-07-2018, 08:24 PM
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What engine/trans?
 
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Old 04-07-2018, 08:29 PM
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5.9 gas and 46re I believe
 
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Old 04-07-2018, 08:34 PM
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You have a short somewhere..... going to need to look at wiring diagrams, and see where everything has something in common...... That is not going to be any fun to find.
 
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Old 04-07-2018, 08:37 PM
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Any suggestion as to where to find good diagrams
 
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Old 04-07-2018, 09:59 PM
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Grab the 01 service manual from here. It should be close at least.
 
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Old 04-07-2018, 10:01 PM
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Thank you
 
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Old 04-08-2018, 10:07 AM
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could the pcm be at fault? I've traced all these things back to a common plug on the pcm
 
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Old 04-08-2018, 10:40 AM
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It's possible..... Check that plug on the PCM, see if there is any damage, dirt, etc.
 
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Old 04-08-2018, 10:49 AM
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I’ve had a problem with the leak detection pump since I got it. It doesn’t get full voltage and comes from the same plug
 



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