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Jeep
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2009
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Commander Limited, 4.7 P, 4WD
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Repair and Diagnosis
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Engine Performance
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Ignition System
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Front Control Module (FCM) - Electrical Diagnostics
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DTC Troubleshooting
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U0121-Lost Communication With Anti-Lock Brake Module
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Set Conditions
Set Conditions
Set Condition:
Bus messages not received from the Antilock Brake Module for approximately two to five seconds.