U0005high severityNetwork
High Speed CAN Communication Bus (+) High
on 2003 Dodge Ram Van 5.9L V8 · 4WD
What this code means
The CAN High wire voltage is higher than expected, indicating a short to battery voltage.
Symptoms
- CAN bus communication failure
- Multiple module faults
- Warning lights on
Common causes
- CAN H wire shorted to battery power
- Wiring harness damage
- Module internal fault driving CAN H high
Diagnostic steps
- Measure CAN H voltage (should not exceed 4V)
- Inspect wiring for shorts to power wires
- Disconnect modules to isolate fault
- Check for wiring harness rub-through
Repair notes
Repair the short to power on CAN H. Often caused by wiring harness rubbing against sharp edge.
Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus
U0028
Vehicle Communication Bus A Performance