U0048
NetworkModule Communicationhigh severityControl Module Communication Bus D Shorted To Ground
What U0048 Means
Communication bus D is shorted to ground, pulling the signal low. This prevents modules from communicating properly on that bus.
Symptoms
- Multiple warning lights
- Loss of module functions
- No communication with scan tool
Common Causes
- Bus D wire shorted to ground
- Chafed or pinched harness
- Faulty control module
- Corroded connector pins
Diagnostic Steps
- Scan for communication codes
- Inspect bus D wiring for ground short
- Measure resistance to ground
- Isolate modules to find fault
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