U0295 code meaning
Lost Communication With AC/AC Converter Control Module
What U0295 means
An AC/AC converter takes in alternating current and delivers alternating current at a different voltage or frequency, with no DC storage in between. In electric vehicles such a stage can be part of a charger: in patent US9973107B2 a matrix stage converts the three mains phases directly to a high-frequency waveform, which an isolating transformer passes on before rectification for the battery. Other uses are possible, for example adapting power for on-board outlets. U0295 means the module controlling that converter has fallen silent on the network. No manufacturer documents U0295, and public service literature contains no module of this name; what it does is up to the vehicle design. If it sits in the charging path, CARB requires plug-in hybrids to detect faults that stop or slow charging.
U0295 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0295
- AC charging not possible or interrupted
- Charging or power supply warning
Common causes of U0295
- PossibleLow-voltage supply or wake-up of the converter module missing
- PossibleBus wiring or connector to the converter damaged
- Less likelyConverter shut down after overheating or a coolant fault
- Less likelyConverter control module internally failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac ac converter moduleVehicle bus wiring
What each part of U0295 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 95 | The exact fault in that area. |
What to do next
- Note U0295 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 U0295
What does U0295 mean?
U0295 means "Lost Communication With AC/AC Converter Control Module". An AC/AC converter takes in alternating current and delivers alternating current at a different voltage or frequency, with no DC storage in between. It is a generic code, so it means the same on every make.
Is it safe to drive with U0295?
U0295 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0295 fail an emissions test?
U0295 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 U0295 to fix?
Difficulty: hard. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will U0295 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.