What Does U0059 Mean?
The positive wire of communication bus D is reading above normal voltage threshold. This typically indicates a short to power or loss of proper bus termination causing voltage to float high.
Common Causes
35%
Short to power (battery voltage) in CAN D+ circuit
25%
Missing or failed termination resistor causing improper biasing
20%
Faulty control module with internal short to voltage supply
15%
Damaged wiring harness contacting power wire
5%
Aftermarket accessory installation causing cross-wiring
Diagnostic Steps
1
Step 1: Measure voltage on CAN D+ line with ignition on; reading should be near 2.5V, not near battery voltage
2
Step 2: Check for shorts to power using ohmmeter between CAN D+ and battery positive with ignition off
3
Step 3: Verify termination resistors are present by measuring 60 ohms between CAN D+ and CAN D-
4
Step 4: Disconnect modules one at a time while monitoring voltage to identify faulty module
5
Step 5: Inspect recent repair work or aftermarket installations for improper wiring connections
Estimated Repair Cost
$150 - $950
Parts + labor, varies by vehicle and location
The positive wire of communication bus D is reading above normal voltage threshold. This typically indicates a short to power or loss of proper bus termination causing voltage to float high.
The most common cause of U0059 (Vehicle Communication Bus D (+) High) is: Short to power (battery voltage) in CAN D+ circuit
Typical repair costs for U0059 range from $150 to $950, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Communication loss may affect critical safety systems including airbags, ABS, and electronic brake distribution. Vehicle may experience reduced functionality or fail to start.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0059 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Communication Network
Difficulty
Type
Generic (SAE)
Recommended Tools
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