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Old 04-27-2011, 03:45 AM   #1 (permalink)
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Code p2509

My truck is showing trouble code p2509. I've looked it up but can't seem to find any solutions. Any suggestions? Also is there any way to clear that code without having a code reader or programmer?
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Old 04-27-2011, 04:16 AM   #2 (permalink)
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I had this same problem for the longest time and could not figure out why, I was told the batteries were connected wrong and the stealership told me I was going to have to replace the entire cluster because the internal computer was fried...I was immediately suspicious, if my internal computer was fried how would all my guages continue to work. Anyway I just said to myself truck still runs fine I'm not going to spend the $800 I was quoted for their "fix." After a while it seemed like the truck was having a hard time starting, my overhead MPG would constantely read 15.0, and would die quickly. Went to Oreileys and found out both my batteries were shot. Bought new batteries and truck fired up like new and never saw the code again and the overhead is working fine. Its been a good 6 months. Also before I realized the batteries were the problem I disconnected the batteries to try and clear the code it would work but it would come right back on within 30mins. If you already have new batteries I dont know what to tell you . Try the stealership maybe the can be nice and reflash the ECM and not quote you for a new cluster
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Old 04-27-2011, 12:50 PM   #3 (permalink)
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Thanks... I just replaced both batteries, code is still there.. Tried unhooking the batteries to clear the code and it would not clear at all like yours did... I have not had any problems with it starting or anything like that, the truck is running fine just can't figure out what to do about this code... Any other ideas?
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Old 04-28-2011, 07:44 PM   #4 (permalink)
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Any other ideas guys?
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Old 04-30-2011, 08:39 PM   #5 (permalink)
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Im right there with ya. Ive gotten this code in the past but the dealership just said they were stored codes. First time I got the code was about 3 months after having the truck. Second time was a few months ago, same explanation for the dealership. Batteries were cranking slow so I replaced with optima redtops about 2 weeks ago. I decided to drive another vehicle for a couple days and went to go start the truck this morning..... no crank. Batteries are @ 10v according to digital multimeter. Put them on the charger for a couple of hours and got the truck to crank and the engine light came on. Scanner read codes P2509 along with P0562. When first starting the truck, voltage was at 13.2v to 13.4v which is low considering first start voltage is supposed to be around 14.4v. My battery charger has a built in alternator checker and it says the alternator is no bueno. Taking to dealer first thing monday to hit them in the head with a hammer.
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Old 05-01-2011, 09:57 AM   #6 (permalink)
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There is so much info on this if you just search.Only think I can tell ya is clean your connector,post etc etc.Thats all it is
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Old 06-13-2011, 02:28 PM   #7 (permalink)
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Old 07-18-2012, 11:40 AM   #8 (permalink)
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I'm throwin this code as well mine won't start now though anyone figure anything out? The dealer told me I needed to flash the ECM
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