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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 › Possible Causes

Possible Causes

Possible Causes 
CAN B BUS TERMINAL PUSH OUT
SPREAD CAN B BUS TERMINAL
(D55) CAN B BUS (+) CIRCUIT OPEN
INTERNAL OPEN IN A CAN B BUS MODULE
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