What Does U0288 Mean?
The vehicle's network has lost communication with DC to AC converter control module 'A'. This module converts high-voltage DC power from the battery to AC power for electric motors or other systems in hybrid/electric vehicles.
Safety Warning
Vehicle may not operate or may enter limp mode. High-voltage system requires trained technician with proper safety equipment. Do not attempt repair without certification.
Common Causes
35%
Failed DC to AC converter control module
25%
Damaged high-voltage wiring or shielded communication cables
20%
Connector corrosion or loose connection at converter module
15%
CAN bus network fault on high-voltage system network
5%
Loss of power supply to converter module
Diagnostic Steps
1
Step 1: Perform high-voltage safety isolation procedures per manufacturer guidelines before inspection
2
Step 2: Verify low-voltage power and ground supplies to converter control module
3
Step 3: Inspect high-voltage and communication connectors for damage, corrosion, or loose connections
4
Step 4: Test CAN bus communication network using manufacturer-specific diagnostic software
5
Step 5: Replace DC/AC converter module if all power, ground, and network signals are confirmed functional
Estimated Repair Cost
$1,500 - $4,000
Parts + labor, varies by vehicle and location
The vehicle's network has lost communication with DC to AC converter control module 'A'. This module converts high-voltage DC power from the battery to AC power for electric motors or other systems in hybrid/electric vehicles.
The most common cause of U0288 (Lost Communication With DC to AC Converter Control Module "A") is: Failed DC to AC converter control module
Typical repair costs for U0288 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 not operate or may enter limp mode. High-voltage system requires trained technician with proper safety equipment. Do not attempt repair without certification.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0288 to identify the root cause.
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Quick Info
Category
Network
System
Hybrid/Electric Powertrain
Difficulty
Type
Generic (SAE)
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