What Does U0057 Mean?
This code indicates an open circuit in the positive wire of communication bus D. The network cannot complete its circuit, preventing modules from communicating properly on this bus.
Common Causes
35%
Broken or severed wire in the CAN D+ line
30%
Corroded or damaged connector terminals on bus D+ circuit
20%
Faulty control module with internal open circuit on bus pin
10%
Rodent damage to wiring harness
5%
Failed termination resistor causing perceived open circuit
Diagnostic Steps
1
Step 1: Measure resistance on CAN D+ circuit with all modules disconnected; should read open circuit or very high resistance
2
Step 2: Perform continuity test along entire length of CAN D+ wire from end to end, checking for breaks
3
Step 3: Inspect all connectors on bus D circuit for bent, corroded, or pushed-back pins
4
Step 4: Check wiring diagram to identify all modules on bus D and isolate faulty section by disconnecting modules systematically
5
Step 5: Verify termination resistors are present and measure 60 ohms between CAN D+ and CAN D- when both terminators are connected
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
This code indicates an open circuit in the positive wire of communication bus D. The network cannot complete its circuit, preventing modules from communicating properly on this bus.
The most common cause of U0057 (Vehicle Communication Bus D (+) Open) is: Broken or severed wire in the CAN D+ line
Typical repair costs for U0057 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of communication may disable safety systems such as ABS, stability control, or airbag systems. Vehicle may enter limp mode 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 U0057 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.
