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To access the C codes or chassis codes from the instrument cluster on a 2004 Dodge Ram, insert your key and turn it to the "ON" position. Simultaneously press the odometer reset button. This will enter you into the instrument cluster diagnostic mode where all the gauges will reach maximum values and then return to normal, all the warning lamps will illuminate, and your odometer will display the C Codes indicating any faults it has detected. For a comprehensive list of the C Codes and their meanings, click on this link and navigate to the section titled "INSTRUMENT CLUSTER FAILURE MESSAGE" at http://www.Dodgeownerforums.com/smf/index.phptopic=215.5;wap
In the 2004 Dodge Ram, there is a list of C codes including: C-code 01 for a shorted airbag warning indicator output circuit, C-code 02 for an open airbag warning indicator output circuit, and C-code 03 for a shorted ABS indicator output circuit. It is recommended to check the relevant diagnostic information for each issue.