Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSJEEP2009GRAND CHEROKEE LIMITED, 4.7 P, 4WDREPAIR AND DIAGNOSISENGINE PERFORMANCEIGNITION SYSTEM(FRONT CONTROL MODULE (FCM) - ELECTRICAL DIAGNOSTICS)DTC TROUBLESHOOTINGU0241-LOST COMMUNICATION WITH AUTO HIGHBEAM HEADLAMP CONTROL MODULEDIAGNOSTIC TEST

2009 Jeep Grand Cherokee Limited, 4.7 P, 4WD

Diagnostic Test

2009 Jeep Grand Cherokee Limited, 4.7 P, 4WDSECTION Diagnostic Test

VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
1. With the scan tool, read active DTCs.
  Is this DTC active?
  
  Yes
  - Go to step 2
  No
  - Refer to the Stored Lost Communication test procedure. Refer to Non-DTC Diagnostics/Communication - Diagnosis and Testing
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
1. With the scan tool, read active DTCs from all modules.
  NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.
  
  Does the scan tool display any active DTCs to the conditions listed above?
  
  Yes
  - Go to and perform the appropriate diagnostic procedure.
  No
  - Go to step 3
VERIFY THAT THE AHBM (SMARTBEAM) IS ACTIVE ON THE BUS
1. Turn the ignition on.
2. With the scan tool, select Network View and select Advanced.
3. Verify that the AHBM (SMARTBEAM) is active on the bus.
  Is the AHBM (SMARTBEAM) active on the bus?
  
  Yes
  - Go to step 4
  No
  - Refer to the No Response test procedure. Refer to Non-DTC Diagnostics/Communication - Diagnosis and Testing
CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
1. With the scan tool, select Network View and select Advanced.
  Is there more than one module with active DTCs "Logged Against" the AHBM (SMARTBEAM)?
  
  Yes
  - Replace/update the Inside Rearview Mirror (SMARTBEAM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure
  No
  - Replace/update the module that set this DTC in accordance with the Service Information.
  - Perform the appropriate VERIFICATION TEST.

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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.