Engine Error
U0073
Control Module Communication Bus A Off
Severity
High
Symptoms
Vehicle shuts off, no start, all dashboard lights on, 'no bus' message
Common Causes
- Short in CAN bus wiring
- Water damage to a control module (ABS, TCM, PCM)
- Corroded network connector
- Dead battery
How to Fix
- 1 Test battery and charging system
- 2 Disconnect modules one by one to find the shorted unit
- 3 Repair damaged CAN wiring
- 4 Replace faulty module
Estimated Repair Cost
USD
$100
–
$1500
Diagnostic testing: $150 - $300; Module replacement: $500 - $1,500+