U0296 code meaning
Lost Communication With AC/DC Converter Control Module A
Network system Generic code U02xx codes Check engine light
What U0296 means
An AC/DC converter rectifies alternating current; in plug-in vehicles the best known example is the on-board charger, which also runs in the opposite direction of an inverter feeding a motor. U0296 means converter module A no longer reports on the bus. CARB obliges plug-in hybrids to detect charger malfunctions that prevent full charging or limit the charge rate. Volvo is the maker that names the code: on plug-in XC60 and XC90 models from 2022, brake control module 2 logs BCM2-U029600, the ESC lamp comes on and Pure mode is locked out whenever a third-party device or Y-splitter loads the diagnostic socket (TJ 36559). On 2016–2018 T8 models the code appeared intermittently next to rear-axle inverter faults and cleared with inverter software (TJ 33723).
U0296 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.3 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0296
- ESC or hybrid system warning in the cluster
- Pure electric driving not available
- Charging from the grid not possible
Common causes of U0296
- Most likelyAftermarket device or Y-splitter on the diagnostic connector disturbing the bus
- PossibleOutdated software in the converter or inverter module
- PossibleSupply, ground or bus wiring of converter A faulty
- Less likelyConverter module A internally failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac dc converter module aVehicle bus wiring
What each part of U0296 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 U0296 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 U0296
What does U0296 mean?
U0296 means "Lost Communication With AC/DC Converter Control Module A". An AC/DC converter rectifies alternating current; in plug-in vehicles the best known example is the on-board charger, which also runs in the opposite direction of an inverter feeding a motor. It is a generic code, so it means the same on every make.
Is it safe to drive with U0296?
Drive gently and only to a workshop. With U0296 the car can go into limp mode (reduced power) to protect itself.
Will U0296 fail an emissions test?
Yes, it can. U0296 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U0296 to fix?
Difficulty: medium. A typical repair takes 0.3 to 5 hours of work. This is a job for a workshop.
Will U0296 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.