What Does U0599 Mean?
The communication network has received invalid or corrupted data from the primary DC to DC converter control module. This converter typically steps down high-voltage DC power to charge the 12V battery in hybrid/electric vehicles.
Common Causes
40%
Failed DC to DC converter control module A with internal fault or memory corruption
25%
Corroded or damaged connectors and wiring between converter module A and CAN bus network
20%
Defective voltage sensor or current sensor within DC to DC converter A providing invalid readings
10%
Software corruption or programming error in DC to DC converter module A
5%
Intermittent short circuit or resistance in module ground circuit
Diagnostic Steps
1
Step 1: Check live data from DC to DC converter module A to identify which specific parameters are showing invalid values
2
Step 2: Perform visual inspection of DC to DC converter module A connectors, terminals, and wiring harness for water intrusion, corrosion, or physical damage
3
Step 3: Test ground circuit continuity and resistance for DC to DC converter module A (should be less than 1 ohm to chassis ground)
4
Step 4: Check for available software updates or technical service bulletins for the DC to DC converter control module A
5
Step 5: If wiring and grounds are verified good, substitute or replace DC to DC converter control module A
Estimated Repair Cost
$600 - $2,800
Parts + labor, varies by vehicle and location
The communication network has received invalid or corrupted data from the primary DC to DC converter control module. This converter typically steps down high-voltage DC power to charge the 12V battery in hybrid/electric vehicles.
The most common cause of U0599 (Invalid Data Received From DC to DC Converter Control Module "A") is: Failed DC to DC converter control module A with internal fault or memory corruption
Typical repair costs for U0599 range from $600 to $2,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause 12V battery not to charge properly, leading to eventual loss of all vehicle electrical systems. Vehicle may become inoperable if 12V battery depletes.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0599 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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