Hugh Danyluk Posted on Apr 01, 2016

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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

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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Marvin

Dodge Master 85,242 Answers
Posted on Apr 01, 2016

Marvin

Dodge Master

Joined: Jun 20, 2008

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

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 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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