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post #1 of 5 Old 04-16-2013, 02:03 PM Thread Starter
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Computer issue question?

Ok so here's the problem I am having. I have a 2003 6.0l powerstroke and ill be driving down the road or on the highway and it will randomly turn on tow/haul mode with the orange light blinking on and off. It won't shift at all when this happens usually. Another thing that happens sometimes is on the highway ill be going around 70mph and it will randomly have the tow/haul thing again and itll go to shift and itll get stuck in neutral or something and if i hit the gas it just revs and then eventually slam really hard into a gear and stay in that gear. I have an sct and it runs various codes. I have ran it at times on a custom tune with it running fine then this happens and then return it to stock and runs fine for a little and even a strategy tune which i was running over a weekend trip down to myrtle beach which was 8 hours with it running fine and then today it flipped out again. Let me know if anyone else has had this problem or knows of what the problem is. Thanks
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post #2 of 5 Old 04-16-2013, 02:14 PM
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Ill bet the blinking lights are all codes the truck is trying to send you. My old Pete i used to drive would blink like this. When I mentioned it to the mech he told me to write down how many blinks and what blinked. Sure enuff truck was just talking Peterbilt to me and I was to dumb to know.

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post #3 of 5 Old 04-16-2013, 02:46 PM
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Thats true, its letting you know theres a problem with the transmission. You need to have the codes pulled from the transmission controller and see. A lot of the times its a failing trans temp sensor. You can also return the tune back to stock and see if it helps.

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post #4 of 5 Old 04-16-2013, 03:38 PM Thread Starter
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i've ran the truck on stock before and it does the same problem. I know it prolly isn't good for the truck but i keep switching between the tunes until it freaks out again and then change it. I just had the tranny rebuilt by a powerstroke mechanic trusted maybe 2000k miles ago. And last time i had it in the shop i had him check everything and nothing came up. Ill run it tomorrow and see what codes my sct will pick up maybe thatll help with the answer
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post #5 of 5 Old 04-16-2013, 05:16 PM
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I did some searching and found that most times it the trans temp sensor, it causes the trans to go into a limp mode. If you conclude that its the sensor its not a hard fix although it is in the trans above the pan.

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