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Old 01-29-2011, 04:26 AM   #25 (permalink)
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Quote:
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i got the the same code the other morning when it was -12 out and tried to start. No a clue but its been 4 days and it hasnt gone away.truck runs normal with it on thou. . . maybe a valve adjustment is in order?
ya I got it all fixed, it was just a sensor $40. And the other code look in the above post!
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Old 02-26-2011, 01:38 AM   #26 (permalink)
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So what sensor did you change?
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Old 02-26-2011, 04:49 AM   #27 (permalink)
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The crank shaft one.....
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Old 04-13-2011, 01:05 AM   #28 (permalink)
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The crank shaft one.....
did your truck accelerate at stop signs with foot on brake:
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Old 04-14-2011, 12:17 AM   #29 (permalink)
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Ya sometimes it wanted to do it, y? That happen to u?
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Old 04-20-2011, 12:26 AM   #30 (permalink)
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Ya sometimes it wanted to do it, y? That happen to u?
yeah all the time now....it was every once in awhile!!!sorry for getting in on your thread...new to this won't happen again...
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Old 04-24-2011, 10:02 PM   #31 (permalink)
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no worries, its cool! after i changed my filters it slowly disappears and not doing it anymore.
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Old 07-17-2011, 03:48 PM   #32 (permalink)
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So is the general consensus that changing the batteries fixes the P2509? My trucks been starting really weak and threw P2509 and P1740 (think this one's from the low-stall converter I threw in). Have new batteries solves the weak start and codes? Report back! thanks!!
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Old 07-17-2011, 03:58 PM   #33 (permalink)
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Batteries have fixed everyone's P2509 issue that I know of.
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Old 07-21-2011, 06:23 PM   #34 (permalink)
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New batteries fixed mine, too! Make sure you change both. Six months ago, Autozone argued with me and only replaced only one of my failed bats (only 13 months old). Today, the second battery went bad so they ended-up replacing both for free.
I wish they would have listened to me six months ago. Good luck!
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Old 08-24-2011, 07:53 AM   #35 (permalink)
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I've just got this code P2509 last week. Couldn't figure it out at first, until the starter wouldn't engage. Used a hydrometer on the batteries, each have one cell very low, SG=1.150. I'm using a slow charger and the passenger side is at 1.250 on the bad cell, the drivers side is still at 1.150. I have read that the PCM takes voltage from the drivers side and must see 12 or 12.3. If it doesn't it lights up the CE lamp. I think it still has the OEM batteries.

Today I may swap sides on the batteries, then see if that changes things.
Besides I feel like doing a couple of 60 lbs deadlift

That will give me a chance to clean the terminals as well.

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Old 09-07-2011, 05:19 AM   #36 (permalink)
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Quote:
Originally Posted by gixxerjay View Post
Check engine light came on. Scanned it and it said that I had 1 code.(p2509 powerdowndata lost error)

Anyone have any ideas what this is?
hi, my8, P2509 "ECM/PCM Power Input Signal Intermittent,
it is probable a bad connection to the engine computer. It's got two power feeds, switched/key and constant. The motor won't run without the switched key power on. Long story short, the computer can detect if the power leads aren't solid. That code should give the dealer something to look for. Before bringing it in check the battery terminals, all the fuses, all the relays, and the PCM connector itself (if it's easily accessable).
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