An RVer with a 2003 Journey 32T, 300 hp 5.9 Cummins reported that the check engine light only comes on after a warm restart, when the temperature gauge is above about 1/4. Cold starts are normal and the coach can run all day without the light appearing until it is restarted warm.
Members asked for more complete diagnostic details and noted that free code reading is available at some auto parts stores, though the owner already had a reader. The reported code was “2003 15,” which the owner...
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An RVer with a 2003 Journey 32T, 300 hp 5.9 Cummins reported that the check engine light only comes on after a warm restart, when the temperature gauge is above about 1/4. Cold starts are normal and the coach can run all day without the light appearing until it is restarted warm.
Members asked for more complete diagnostic details and noted that free code reading is available at some auto parts stores, though the owner already had a reader. The reported code was “2003 15,” which the owner said a Cummins representative described as a placeholder code with no exact meaning. Suggestions were to treat it as a new chassis diagnostic issue, gather clearer fault information, and contact a Freightliner repair facility or Freightliner chassis-focused resources; no confirmed fix was identified.