What Does U0047 Mean?
Communication bus C is experiencing performance issues such as slow communication, intermittent signals, or excessive errors. The bus is functioning but not meeting required specifications.
Common Causes
35%
Poor connections or high resistance in bus C circuit
25%
Incorrect or degraded terminating resistor on bus C
15%
Electromagnetic interference affecting bus C signal quality
15%
Marginal control module with degraded communication capability
10%
Damaged twisted pair wiring causing signal degradation
Diagnostic Steps
1
Step 1: Use oscilloscope to examine bus C signal quality; check for proper waveform, voltage levels, and bit timing
2
Step 2: Measure terminating resistance between CAN C(+) and C(-); should be approximately 60 ohms
3
Step 3: Check all connectors on bus C circuit for corrosion, loose pins, or high resistance
4
Step 4: Monitor bus error counters and message rates using advanced scan tool or CAN analyzer
5
Step 5: Clean or replace poor connections, verify proper wire routing away from interference sources
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
Communication bus C is experiencing performance issues such as slow communication, intermittent signals, or excessive errors. The bus is functioning but not meeting required specifications.
The most common cause of U0047 (Vehicle Communication Bus C Performance) is: Poor connections or high resistance in bus C circuit
Typical repair costs for U0047 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent communication issues may cause unpredictable system behavior, warning lights, or degraded performance. Vehicle may be drivable but unreliable.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0047 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Communication Network
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
