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Jeep
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2009
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Grand Cherokee SRT-8
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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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U0021-Can B Bus (+) Circuit Open
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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