What Does U0289 Mean?
Communication has been lost with DC to AC converter control module 'B'. This indicates a secondary or redundant converter module failure in vehicles with multiple DC/AC converters for the electric drive system.
Safety Warning
Vehicle may have reduced power or fail to operate. High-voltage components require certified technician with specialized training and equipment. Unsafe for non-certified repair.
Common Causes
35%
Failed DC to AC converter control module B
25%
Damaged high-voltage wiring or communication harness to module B
20%
Connector damage or corrosion at converter B module
15%
CAN bus network fault affecting module B communication
5%
Power supply interruption to converter module B
Diagnostic Steps
1
Step 1: Follow high-voltage safety protocols and ensure system is de-energized before inspection
2
Step 2: Check low-voltage power and ground circuits at converter module B
3
Step 3: Inspect all high-voltage and low-voltage connectors for physical damage or corrosion
4
Step 4: Use manufacturer scan tool to test network communication and monitor converter B status
5
Step 5: Replace converter module B if electrical supplies and communication network are verified operational
Estimated Repair Cost
$1,500 - $4,000
Parts + labor, varies by vehicle and location
Communication has been lost with DC to AC converter control module 'B'. This indicates a secondary or redundant converter module failure in vehicles with multiple DC/AC converters for the electric drive system.
The most common cause of U0289 (Lost Communication With DC to AC Converter Control Module "B") is: Failed DC to AC converter control module B
Typical repair costs for U0289 range from $1,500 to $4,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may have reduced power or fail to operate. High-voltage components require certified technician with specialized training and equipment. Unsafe for non-certified repair.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0289 to identify the root cause.
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Quick Info
Category
Network
System
Hybrid/Electric Powertrain
Difficulty
Type
Generic (SAE)
Recommended Tools
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