Diagnostic Test

2008 Jeep Commander Overland, 4WDSECTION Diagnostic Test
  1. ACTIVE DTC 

    Ignition on, engine not running.

    NOTE: If this code sets during extreme ambient temperatures, improper installation of a block heater could be the cause of this DTC.

    With a scan tool, select View DTCs.

    Diagnose all other ECT and Cooling System codes before continuing.

    Is the DTC Active at this time? 

    Yes 

    1. Go To  2.

    No 

    1. Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
  2. LOW COOLANT LEVEL 
    NOTE: If an Engine Coolant Temperature (ECT) DTC is set along with this code, diagnose the ECT DTC first.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.