Diagnostic Test

WARNING: This page is about a different car, the 2024 Jeep Grand Wagoneer L and 2024 Jeep Grand Wagoneer. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
NOTE:
Diagnose any Communication DTCs before continuing.
1. Start the engine.
2. With the scan tool, read Powertrain Control Module (PCM) DTCs and Freeze Frame Data and record on the repair order.
3. Using the recorded Freeze Frame Data and the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
4. With the scan tool, read DTCs.
  Is the DTC active or pending?
  
  Yes
  - Replace the Headlamp Switch in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE STOP/START MODE SWITCH OPERATION
1. Turn the ignition off.
2. Disconnect the Headlamp Switch harness connector.
  NOTE:
  The Stop/Start Mode Switch is combined with the Headlamp Switch.
3. Turn the ignition on.
4. With a scan tool, read PCM DTCs.
  NOTE:
  The DTC P05BD-00-STOP-START MODE SWITCH RANGE- PERFORMANCE should be active or pending with the Headlamp Switch harness connector unplugged.
  
  Does the scan tool display as described above?
  
  Yes
  - Replace the Headlamp Switch in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .