U0043high severityNetwork
Control Module Communication Bus D Shorted To Ground
on 2000 Ram 1500 3.9L V6 · 4WD
What this code means
Bus D is shorted to ground, pulling the signal voltage low and stopping communication. Modules on this bus cannot exchange data.
Symptoms
- Multiple warning lights
- Loss of system functions
- No module response
Common causes
- Bus D wire grounded out
- Chafed harness against metal
- Water intrusion causing ground path
- Failed module grounding bus
Diagnostic steps
- Scan network for faults
- Check bus D continuity to ground
- Inspect harness for chafing
- Disconnect modules to isolate short
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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
U0005
High Speed CAN Communication Bus (+) High
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