What Does U0053 Mean?
The negative (-) wire of communication bus C is reading abnormally high voltage. This suggests an electrical fault causing improper voltage levels on the bus network.
Common Causes
35%
Short between CAN C- and CAN C+ wires in harness
30%
Faulty module driving incorrect voltage on CAN C- line
20%
CAN C- wire shorted to power or signal wire
10%
Failed terminating resistor causing voltage imbalance
5%
Connector pin cross-connection or miswiring
Diagnostic Steps
1
Step 1: Measure voltage on both CAN C+ and CAN C- lines (differential voltage should be within spec)
2
Step 2: Disconnect modules systematically to identify which is causing voltage anomaly
3
Step 3: Check for shorts between CAN C+ and CAN C- wires using resistance measurement
4
Step 4: Inspect connectors for crossed pins, pushed-out terminals, or corrosion creating bridges
5
Step 5: Test terminating resistors and verify proper installation at both network ends
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The negative (-) wire of communication bus C is reading abnormally high voltage. This suggests an electrical fault causing improper voltage levels on the bus network.
The most common cause of U0053 (Vehicle Communication Bus C (-) High) is: Short between CAN C- and CAN C+ wires in harness
Typical repair costs for U0053 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Network communication errors may affect safety-critical systems like airbags, ABS, or lane keeping assist. Have the vehicle diagnosed promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0053 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.
