What Does U059A Mean?
Invalid or illogical data is being transmitted from the secondary DC to DC converter control module to other vehicle systems via the communication network. This indicates a data integrity problem with converter module B.
Common Causes
38%
Malfunctioning DC to DC converter control module B with processor or memory failure
28%
Wiring harness damage or connector corrosion between converter module B and vehicle network
18%
Internal sensor failure within DC to DC converter B sending erroneous values
11%
Outdated or corrupted software/calibration in DC to DC converter module B
5%
CAN bus communication fault affecting data transmission integrity
Diagnostic Steps
1
Step 1: Use advanced scan tool to monitor real-time data from DC to DC converter module B and identify which specific data PIDs are invalid
2
Step 2: Inspect all connectors and wiring associated with DC to DC converter module B for damage, bent pins, or signs of overheating
3
Step 3: Verify proper power supply and ground connections to DC to DC converter module B using multimeter
4
Step 4: Check for manufacturer software updates, recalls, or TSBs related to DC to DC converter module B
5
Step 5: Perform bidirectional controls test if available to verify module responds correctly to commands; replace module if it fails tests
Estimated Repair Cost
$600 - $2,800
Parts + labor, varies by vehicle and location
Invalid or illogical data is being transmitted from the secondary DC to DC converter control module to other vehicle systems via the communication network. This indicates a data integrity problem with converter module B.
The most common cause of U059A (Invalid Data Received From DC to DC Converter Control Module "B") is: Malfunctioning DC to DC converter control module B with processor or memory failure
Typical repair costs for U059A range from $600 to $2,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May result in unreliable 12V system charging and potential failure of auxiliary electrical systems. Can lead to vehicle becoming disabled if 12V battery fails.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U059A 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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