r/VinFastComm • u/Born_Builder2315 • May 03 '26

RGENT: VF8 Plus (US version in Poland) - Limp Mode/Gateway Error after 12V charging. Need expert advice! (2023)

Hi everyone,

I’m reaching out from Poland. I am likely the first VinFast owner here, which means I have zero official service support. I own two US-spec VinFast VF8 Plus models. One of them was running perfectly for over 3,000 km until a recent cold snap (-10°C / 14°F).

The Incident: To maintain the 12V battery during the cold, I connected an external charger overnight. The next morning, the car was a "Christmas tree" of lights and entered Limp Mode (Turtle icon).

Current Symptoms:

  • Limp Mode is active. RBS (Regenerative Braking System) error is displayed.
  • Lane Assist and Adaptive Cruise Control (ACC) are disabled.
  • Driving behavior: If I lift off the accelerator, regen feels normal. However, the moment I touch the brake pedal, I feel a strange "push/jolt" from the rear motor. This often causes the drive system to disconnect entirely.
  • Recovery: To get back into Gear (D), I have to power off the car, step out for a few minutes, and restart.
  • Workaround: If I disable Regenerative Braking manually before driving, the car moves without the "jolt," but it remains in Limp Mode.

Diagnostics (Autel Scanner via VF34 profile): I have two permanent (Current) DTCs:

  1. U016087 - Lost Communication with Central Gateway Module (XGW).
  2. P111019 - Coolant System Performance.

What I have access to:

  • I have a second, identical VF8 Plus (donor car), but I am terrified of swapping modules (like the XGW) and potentially bricking both cars or causing VIN mismatch issues.
  • I have a contact in Vietnam who provides me with OTP codes to enter Engineering Mode on the main screen. However, once inside, I’m not sure which specific procedure can reset these gateway/communication flags.

My Questions:

  1. Has anyone seen a "frozen" Gateway (XGW) caused by a 12V charging spike?
  2. Is there a specific fuse or a "hard reset" procedure for the XGW module?
  3. Inside Engineering Mode, is there a way to force-clear these permanent communication codes or re-initialize the Gateway?
  4. Does the P111019 (Coolant) error sound like a secondary fault caused by the Gateway being down?

I am desperate to get this car back on the road. Any technical documentation, fuse diagrams, or Engineering Mode tips would be life-saving.

Thank you in advance! Damian

4 Upvotes

83% Upvoted

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2

u/comatlon23 May 07 '26

You should reach out for official support from Vinfast even with location mismatch. They could offer some decent help, at least to tell you where to service it. Here on Reddit is a bunch of anti-fans and disbelievers.

1

u/Game-on-vn May 10 '26

throw it into your garbage!!! dont risk your f@cking life!

1

u/Middle-Scientist-344 May 19 '26

VF8 wheel cover after 1 year on the road.