Code
U0599
Generic
U — Network/User
Invalid Data Received From DC/DC Converter Control Module A
AI status
Completed
Completed
100%
Causes
- Faulty DC/DC converter control module (Module A)
- Intermittent or open/shorted wiring or poor connector at the DC/DC module
- CAN/LIN network communication faults (bus short, high resistance, missing termination)
- Low or missing module power or ground
- Software incompatibility or corrupted module calibration
- Electrical noise or interference (high-voltage system switching) affecting message integrity
Symptoms
- 12V accessory failures or intermittent 12V system issues
- Battery or charging system warnings (battery light, message center warnings)
- Reduced functionality of systems that rely on 12V bus
- Illumination of general network or hybrid/EV warning lights
- Possible vehicle limp mode or limited accessory operation
- Stored communication/integrity related DTCs for other modules
What to check
- Read all stored and pending DTCs and note freeze-frame and timestamp data
- Verify the DC/DC Converter Control Module A is present and responsive on the network with a scan tool
- Inspect connectors and wiring for damage, corrosion, or poor mating at the DC/DC module
- Check module supply voltage and ground circuits for proper values and continuity
- Scan for related U-codes and powertrain/body module errors that could indicate a network problem
- Check CAN bus voltages and termination resistors with a multimeter or oscilloscope
Signal parameters
- CAN message ID(s) assigned to DC/DC Converter Control Module A (consult vehicle-specific data)
- Expected message frequency (Hz) and timeout thresholds
- Typical data bytes: module status bits, 12V output voltage, enable/disable flags, fault/status codes
- Bus voltage levels: CAN_H ~2.5 V idle, differential ~0 V (idle) to ~2 V differential during signaling
- Checksum or CRC presence in message payload (if used by manufacturer)
- Acceptable ranges for reported 12V output and status values (vehicle-specific)
Diagnostic algorithm
- Verify: Record U0599 and all related codes; note time stamps and vehicle state when code set (ignition ON, driving, charging).
- Reproduce: Attempt to reproduce the fault by cycling ignition and under the conditions noted in freeze frame (charge/discharge events, accessory load).
- Scan Tool: Use a capable scan tool to query the DC/DC Converter Control Module A for presence, status, and message stream. Note missing or malformed messages.
- Visual: Inspect connectors and wiring harness to the DC/DC module for corrosion, bent pins, chafing, or heat damage. Repair any physical faults.
- Power/Ground: Measure battery voltage at the module power input and verify a low-resistance ground. Repair poor supply/ground connections.
- Network: With meter/oscilloscope, check CAN_H and CAN_L signals at the module and at a known-good node. Look for missing signals, constant high/low, excessive noise, or incorrect termination.
- Compare: If another identical module on the same vehicle communicates normally, compare signals and power/grounds between modules.
- Clear & Test: Clear codes and perform a drive or exercise the vehicle under conditions that previously set the code to confirm persistence.
- Software: Verify module software/calibration level and reflash or reprogram if the supplier has an update or if a replacement module was installed without correct programming.
- Replace: Only if diagnostics indicate the module itself is faulty after wiring, power, and network checks are good, replace the DC/DC Converter Control Module A and verify correct programming/configuration.
- Post-repair: Confirm repair by clearing codes and verifying no recurrence during relevant vehicle operation.
Likely causes
- Damaged connector or corroded pins at DC/DC converter control module
- Loose or corroded ground or supply feed to the DC/DC module
- Failed DC/DC converter control module sending invalid messages
- CAN bus wiring open, short to battery or ground, or failed termination resistor
- Module software mismatch after replacement or update
Fault status
Status
Invalid or corrupted data message received from DC/DC Converter Control Module A. Message failed integrity/format checks and was rejected by receiving module(s).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Brands with available manuals
9,688
The library contains 9,688 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
U0599
HYUNDAI
U — Network/User
Invalid Data Received From DC to DC Converter Control Module “A”
AI status
Completed
Completed
100%
Causes
- Faulty DC/DC converter control module (Module A)
- Intermittent or open/shorted wiring or poor connector at the DC/DC module
- CAN/LIN network communication faults (bus short, high resistance, missing termination)
- Low or missing module power or ground
- Software incompatibility or corrupted module calibration
- Electrical noise or interference (high-voltage system switching) affecting message integrity
Symptoms
- 12V accessory failures or intermittent 12V system issues
- Battery or charging system warnings (battery light, message center warnings)
- Reduced functionality of systems that rely on 12V bus
- Illumination of general network or hybrid/EV warning lights
- Possible vehicle limp mode or limited accessory operation
- Stored communication/integrity related DTCs for other modules
What to check
- Read all stored and pending DTCs and note freeze-frame and timestamp data
- Verify the DC/DC Converter Control Module A is present and responsive on the network with a scan tool
- Inspect connectors and wiring for damage, corrosion, or poor mating at the DC/DC module
- Check module supply voltage and ground circuits for proper values and continuity
- Scan for related U-codes and powertrain/body module errors that could indicate a network problem
- Check CAN bus voltages and termination resistors with a multimeter or oscilloscope
Signal parameters
- CAN message ID(s) assigned to DC/DC Converter Control Module A (consult vehicle-specific data)
- Expected message frequency (Hz) and timeout thresholds
- Typical data bytes: module status bits, 12V output voltage, enable/disable flags, fault/status codes
- Bus voltage levels: CAN_H ~2.5 V idle, differential ~0 V (idle) to ~2 V differential during signaling
- Checksum or CRC presence in message payload (if used by manufacturer)
- Acceptable ranges for reported 12V output and status values (vehicle-specific)
Diagnostic algorithm
- Verify: Record U0599 and all related codes; note time stamps and vehicle state when code set (ignition ON, driving, charging).
- Reproduce: Attempt to reproduce the fault by cycling ignition and under the conditions noted in freeze frame (charge/discharge events, accessory load).
- Scan Tool: Use a capable scan tool to query the DC/DC Converter Control Module A for presence, status, and message stream. Note missing or malformed messages.
- Visual: Inspect connectors and wiring harness to the DC/DC module for corrosion, bent pins, chafing, or heat damage. Repair any physical faults.
- Power/Ground: Measure battery voltage at the module power input and verify a low-resistance ground. Repair poor supply/ground connections.
- Network: With meter/oscilloscope, check CAN_H and CAN_L signals at the module and at a known-good node. Look for missing signals, constant high/low, excessive noise, or incorrect termination.
- Compare: If another identical module on the same vehicle communicates normally, compare signals and power/grounds between modules.
- Clear & Test: Clear codes and perform a drive or exercise the vehicle under conditions that previously set the code to confirm persistence.
- Software: Verify module software/calibration level and reflash or reprogram if the supplier has an update or if a replacement module was installed without correct programming.
- Replace: Only if diagnostics indicate the module itself is faulty after wiring, power, and network checks are good, replace the DC/DC Converter Control Module A and verify correct programming/configuration.
- Post-repair: Confirm repair by clearing codes and verifying no recurrence during relevant vehicle operation.
Likely causes
- Damaged connector or corroded pins at DC/DC converter control module
- Loose or corroded ground or supply feed to the DC/DC module
- Failed DC/DC converter control module sending invalid messages
- CAN bus wiring open, short to battery or ground, or failed termination resistor
- Module software mismatch after replacement or update
Fault status
Status
Invalid or corrupted data message received from DC/DC Converter Control Module A. Message failed integrity/format checks and was rejected by receiving module(s).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
371
Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HYUNDAI
-
HYUNDAI: 2023
-
Elantra
-
Elantra N
-
Kona N
-
Tucson
- Hybrid Blue
- Hybrid Limited
- Hybrid SEL Convenience
- Limited, Eng CD G4EN, 4WD
- Limited, Eng CD G4EN, FWD
- Limited, Eng CD G4KN, 4WD
- Limited, Eng CD G4KN, FWD
- N Line, Eng CD G4EN, 4WD
- N Line, Eng CD G4EN, FWD
- N Line, Eng CD G4KN, 4WD
- N Line, Eng CD G4KN, FWD
- Plug-In Hybrid Limited
- Plug-In Hybrid SEL
- SE, Eng CD G4EN, 4WD
- SE, Eng CD G4EN, FWD
- SE, Eng CD G4KN, 4WD
- SE, Eng CD G4KN, FWD
- SEL, Eng CD G4EN, 4WD
- SEL, Eng CD G4EN, FWD
- SEL, Eng CD G4KN, 4WD
- SEL, Eng CD G4KN, FWD
- XRT, Eng CD G4EN, 4WD
- XRT, Eng CD G4EN, FWD
- XRT, Eng CD G4KN, 4WD
- XRT, Eng CD G4KN, FWD
-
-
HYUNDAI: 2022
-
Elantra N
-
Kona N
-
Veloster N
-
HYUNDAI: 2021
-
Veloster N
-
HYUNDAI: 2020
-
Palisade
-
Veloster N
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email