Question about 2004 Dodge Ram 3500 Truck

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Dodge 3500 diesel 2004 c code 23 and 27 and ac,,,,how to fix or figure out...these are three separate c codes...key cycles are beside them....how do I fix or clear them? please ...someone help me

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  • Hugh Danyluk
    Hugh Danyluk Apr 01, 2016

    To be precise...the key cycles I left out of the question...error codes 23, 27, and ac ..i know what it says for the codes...but don't know how to fix or clear or???? can anyone help?...i don't want to pay a dealership

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A C-23 code indicates that 27 key cycles ago, the headlamp switch input circuit was open - whatever that means.

Posted on Apr 01, 2016

Testimonial: "Two separate codes. 23, 27, as well as ac...i know what they say it means for each..just need to know how to fix....or clear...or????....can anyone help?"

  • Marvin
    Marvin Apr 01, 2016

    It can be caused by a failing diode in the alternator. Normal testing of the alternator will not show this.

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C codes,,,,,23,,,27,,,ac.... these are the error codes...not key turns....i know what they mean in English...but don't know how to fix or clear...can someone please help me....


UNHOOK YOUR NEGATIVE CABLE ON BATTERY AND TURN AND HOLD KEY TO START POSITION FOR A TEN SECOND COUNT WAIT 15 MINUTES AND THE CODES SHOULD BE CLEARED IF THE CAR THROWS ANYMORE CODES AFTER THIS THEN GO GET IT REPAIR, DO NOT CLEAR ANY NEW CODES BECAUSE THE SHOPS WILL USE A SCAN TOOL TO READ THE NEW CODES, THAT EASY, I HOPE I HELPED YOU WITH YOUR PROBLEM, THIS IS FROM bLEVINS AUTO REPAIR IN ALTURAS CA,,,, THANK YOU...

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