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Home › Jeep › 2009 › Commander Overland, RWD › Repair and Diagnosis › Engine Performance › Ignition System › Front Control Module (FCM) - Electrical Diagnostics › DTC Troubleshooting › U0021-Can B Bus (+) Circuit Open › Set Conditions

Set Conditions

Set Condition:
The Front Control Module (FCM) detects the (D55) CAN B Bus (+) circuit is open.