OBD-II code · Network
U0599 Invalid Data Received From DC/DC Converter Control Module A
A receiving module detected implausible data from DC/DC converter module A. Output current or voltage values fail plausibility checks and are rejected; 12-V system may face load shedding.
Is it safe to drive with U0599?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyModule internal fault or sensor input drift
- PossibleSoftware version mismatch after replacement
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Dc Dc Converter Module A
Related codes
- U059AInvalid Data Received From DC/DC Converter Control Module B
- U0596Invalid Data Received From AC/AC Converter Control Module
- U0597Invalid Data Received From AC/DC Converter Control Module A
- U0598Invalid Data Received From AC/DC Converter Control Module B
- U059BInvalid Data Received From Hybrid/EV Battery Pack Sensor Module
- U059CInvalid Data Received From Drive Motor Control Module C
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.