2005 cummins problem diagnosis - Dodge Cummins Diesel Forum
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post #1 of 12 (permalink) Old 05-23-2019, 06:00 PM Thread Starter
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2005 cummins problem diagnosis

Hey I've got a 2005 cummins, it has 240k miles, completly stock, except for exhaust, intake, and 2micron fuel filter. Okay so the problem is when you have the truck in neutral and hit the throttle up to 3k and let off, the rpm's drop smooth down to 2k and then they go the rest of the way down in jerky steps back to idle. it is throwing trouble code P2509. Just wondering if its a computer problem, injectors, FCA, rail pressure relief valve,?? . the truck has never been tuned, and it doesn't smoke at all on startup, only a whisp of black at full throttle. And help would be appreciated.

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post #2 of 12 (permalink) Old 05-23-2019, 10:46 PM
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Check your battery connections, they are either loose, bad ground, or you need new batteries. That is usually what p2509 means(low power to ecm/pcm). Your idle is normal.

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post #3 of 12 (permalink) Old 05-23-2019, 11:03 PM Thread Starter
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Ok, after I posted I cleaned/brushed all battery connections, and and they were at 12.7v ( dont know what amps), but they crank the engine over very well. if you let it idle for extended period, say 10 minutes, it starts to miss slightly. also when you first start it up when its cold its normal ( it doesnt do the rpm hanging thing). and if you dry rev and hold it to about 1500rpm it missfires.
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post #4 of 12 (permalink) Old 05-23-2019, 11:44 PM
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Sounds like You need injectors.

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post #5 of 12 (permalink) Old 05-24-2019, 07:35 AM
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Like 05PowerHouse said fix P2509 , ECM controls fuel system.
Possible Causes
POOR CONNECTIONS AT THE BATTERIES
LOW BATTERY VOLTAGE
OPEN FUSED B+ TO ECM
OPEN GROUND CIRCUIT
BATTERY + SHORTED TO OTHER CIRCUITS
RETURN CIRCUIT SHORTED
BATTERY + SHORTED TO GROUND
INTERMITTENT CONDITION

Should check good 12.6 volt + volts fully charged batterys, load test them, seen batteries malfunction under load.
check voltage difference between batteries .02 volts to eliminate common issue where crossover cable is internally damaged, cause passengers battery to blow up.
Check grounds to batteries, then check wiring from side of PDC(fusebox) to ECM, connections and grounds on both.

FWIW, not a good idea to be revving engine up, if you have a fueling problem or bad injector ie spraying/leaking and or overfueling can easily cause cylinder/piston/ring damage .

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post #6 of 12 (permalink) Old 05-24-2019, 08:55 AM
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AFTER checking all the above electrical ,,, You sir may need new ( yes new not remans ) injectors. Sorry .

BUT FIRST run a health dose of cleaner thru it , it may help a bit . for a while .

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post #7 of 12 (permalink) Old 05-24-2019, 01:38 PM Thread Starter
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Quote:
Originally Posted by 02smokin View Post
Sounds like You need injectors.
okay so supposing that my injector are shot, is it okay/safe to drive for a little while till i can afford so bigger sticks, or would it be foolhardy to run it at all. i cant tell anything just crusing down the hwy, and no white smoke or anything...Just wondering?? okay i'll check all that electrical stuff, and just put big dose of Howes meaner power cleaner in it. "24hrsparkey'' yes when i get new injectors they will be brand new Bosch.
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post #8 of 12 (permalink) Old 05-24-2019, 02:19 PM
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I'd personally try this...

Try using Hot Shot's stiction eliminator and diesel extreme. This can sometimes fix injector issues (see reviews). You can pick up at an auto store or here: https://smile.amazon.com/dp/B00545OU...v_ov_lig_dp_it

If you get new injectors, consider BBI remanufactured. There have been very good reviews of them the past two months on this forum. They're probably what I'll go for if/when I need them.

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post #9 of 12 (permalink) Old 05-24-2019, 02:43 PM Thread Starter
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Thank you I'll pick those up at Napa today and throw em in there. Okay so people are suggesting running "cleaner" through it, I guess from that, that it okay drive it? just dont want one to stick wide open and take my whole engine with it. Thanks for the injector recommendation, I'll look into those also.
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post #10 of 12 (permalink) Old 05-24-2019, 04:14 PM
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Quote:
Originally Posted by Doozy View Post
Try using Hot Shot's stiction eliminator and diesel extreme. This can sometimes fix injector issues (see reviews). You can pick up at an auto store or here: https://smile.amazon.com/dp/B00545OU...v_ov_lig_dp_it

If you get new injectors, consider BBI remanufactured. There have been very good reviews of them the past two months on this forum. They're probably what I'll go for if/when I need them.
The stiction eliminator does not go in the fuel as far as I know... it goes in the oil.


also...

https://www.cumminsforum.com/forum/3...you-truck.html

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post #11 of 12 (permalink) Old 05-24-2019, 05:09 PM Thread Starter
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going to have batterys load tested today.......question, so the Check Engine Light isn't on, i just decided to do the 3x ignition thing and thats when I saw the p2509 code, so is there any difference since the CEL wasnt on??
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post #12 of 12 (permalink) Old 05-24-2019, 06:38 PM
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Quote:
Originally Posted by 2005CD View Post
going to have batterys load tested today.......question, so the Check Engine Light isn't on, i just decided to do the 3x ignition thing and thats when I saw the p2509 code, so is there any difference since the CEL wasnt on??
Sure, its not an active code, if the light is off, the code is stored in the memory. The low voltage is intermittent with key OFF, maybe your batteries are going out.

The signal is not constant and within parameters with the ignition key turned off. For one reason or another the voltage from the batteries is either low, is dropping due to a power drain or there is a bad connection.

Read more at: https://www.obd-codes.com/p2509
Copyright OBD-Codes.com
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