evorporative system monitor

There are a number of parameters that must be satisfied in order to achieve "readiness" status of the monitors. One is that the car must start from cold, in hot weather this can be difficult. Another is that the engine must reach running temperature, which may not be happening due to a failing thermostat. You may have to consult a manual or a diagnostic specialist. Here are two online sources for you: For AllData: http://bit.ly/AllData_Repair_Manuals_Online Here's the one for Mitchell as well: http://bit.ly/mitchell_repair_manuals_online If you want to find a specialist, here's a directory link for you: https://repairpal.com/gmc-repair-in-mount-holly-north-carolina