FixVault
Home
›
Jeep
›
2010
›
Commander Sport, 3.7 K, AWD
›
Repair and Diagnosis
›
Engine Performance
›
Engine Control Systems
›
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