U019B code meaning
Lost Communication With Battery Charger Control Module A
Network system Generic code U01xx codes Check engine light
What U019B means
U019B means battery charger control module A, the on-board charger of a plug-in vehicle, is no longer heard on the bus. Ford's 2014 OBD code list flags U019B as MIL-relevant, in line with CARB's rule that plug-in hybrids must detect charger faults that stop or slow charging. Audi bulletin 93 23 96 (A7 e quattro 2021-2022) finds U019B00 in hybrid manager J840 with a no-start and a charge plug shown as locked, caused by damaged wires at couplings T6bl and T8bd. On the 2025 e-tron GT the gateway logs it with a yellow electrical fault while a software fix is pending. Ford SSM 52527/52831 (F-150 Lightning 2022-2023) pair it with U0293 and a dead intelligent backup power feature, due to gateway software. U01BB and U027A cover chargers B and C.
U019B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U019B
- Vehicle does not charge or charge plug stays locked
- Electrical system warning, drive system cannot be activated
- Export power or backup power features unavailable
Common causes of U019B
- Most likelyDamaged wires at harness couplings exposed to the environment (Audi A7 PHEV)
- PossibleGateway or controller software (Ford Lightning, Audi e-tron GT)
- PossibleCharger without 12 V supply, ground or wake-up signal
- Less likelyOn-board charger control electronics faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
On board chargerCAN bus
What each part of U019B means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 9B | The exact fault in that area. |
What to do next
- Note U019B 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 U019B
What does U019B mean?
U019B means "Lost Communication With Battery Charger Control Module A". U019B means battery charger control module A, the on-board charger of a plug-in vehicle, is no longer heard on the bus. It is a generic code, so it means the same on every make.
Is it safe to drive with U019B?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U019B fail an emissions test?
Yes, it can. U019B 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 U019B to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will U019B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.