U0596 code meaning
Invalid Data Received From AC/AC Converter Control Module
What U0596 means
An AC/AC converter changes alternating current of one voltage or frequency into another without handing it to the battery first. In vehicles, such a stage can sit in a charger, for example a matrix converter that turns three-phase grid power directly into high-frequency AC for an isolating transformer, as in patent US9973107B2, or it can adapt power for on-board outlets. U0596 means the converter's controller sends status, current or temperature data that the receiving module refuses as implausible. No manufacturer documents U0596, and none names an AC/AC converter module in public service material, so the actual function depends entirely on the vehicle. Charging or outlet power is the most likely casualty; driving should not be affected.
U0596 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0596
- Charging or outlet power interrupted
- Warning about the charging or power system
Common causes of U0596
- PossibleConverter control electronics faulty or overheated
- PossibleConverter and receiving module software not matched
- Less likelyBus wiring to the converter damaged
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac ac converter module
What each part of U0596 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 96 | The exact fault in that area. |
What to do next
- Note U0596 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0596
What does U0596 mean?
U0596 means "Invalid Data Received From AC/AC Converter Control Module". An AC/AC converter changes alternating current of one voltage or frequency into another without handing it to the battery first. It is a generic code, so it means the same on every make.
Is it safe to drive with U0596?
U0596 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0596 fail an emissions test?
U0596 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0596 to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0596 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.