When your engine is experiencing problems, the computer stores a trouble code. How you retrieve the code during diagnostics depends on the year your Dodge was made. Engine codes on 1994 through 1997 Dodge Rams are accessible manually through the "check engine" light on the dash. A DRB diagnostic scanner reads codes for models 1998 and newer. Many automotive supply stores offer diagnostic scanning for free if you don't have, or can't get, a device.
Insert the key in the ignition and turn the ignition on and off quickly in this sequence: on, off, on, off, on. Don't crank the truck. If you crank the engine by mistake, begin the sequence again as the process will be aborted.
Observe the "check engine" light. It will begin to make a series of flashes, indicating two-digit codes that represent the problem with your truck. The light will flash several times for the first digit, pause, then flash several more times to indicate the second digit.
The "check engine" light will flash Code 55 to signal the end of all codes. If your engine has stored no codes, the light will only flash Code 55.
Turn the ignition on while pushing the odometer clearing button simultaneously. Engine codes will read on models with digital odometers. This feature also tests all dash panels.
Turn the key to the "on" position. In some models, this alone will activate the trouble code sequence.
Invest in a diagnostic code scanner or take your Ram to a local auto parts dealer for testing. Basic scan tools begin around $50 and can go up to as much as $5000 for professional devices.
