Use this article if…
- Android Auto won’t launch on MK4 (USB or wireless), not iPhone CarPlay.
- General MK4 phone path → Phone pairing. Bluetooth silent → Bluetooth no sound.
Quick answer
Android Auto that will not start is usually the app, cable, or stale pairing. Update Android Auto, use a proven data USB-C cable, turn off aggressive battery optimisation for AA/BT, and pair again from the headunit.
Problem
- Android Auto will not start over USB or wireless.
Symptoms
- Tapping Android Auto never starts - spins or returns to home.
- USB plugged in but “no device” or constant reconnect chirps.
- Wireless AA fails while USB AA works (or opposite).
Cause
- Android Auto app is outdated, corrupted in cache, or mismatched to the MK4 build.
- Charge-only or poor USB cable, or marginal USB‑C port that disconnects under movement.
- Battery optimisation or vendor power rules suspend Bluetooth/USB routing AA expects.
- Stale “car” registration in Android Auto after phone OS update or MK4 change.
Fix Step-by-step
- Update Android Auto from Play Store; clear its cache if it misbehaves after updates.
- Use a verified data USB‑C cable directly into the MK4.
- On the phone: disable battery optimisation for Android Auto and Bluetooth.
- Delete the MK4 from Bluetooth and forget the car inside Android Auto settings, then start pairing from the headunit wizard again.
- Test another Android handset - proves phone vs unit.
Notes
- Pairing (all phones): My phone won’t pair
- Wireless stability: Wireless CP/AA
- Bluetooth silent: Bluetooth connects but no audio
- Data for maps: Internet on the MK4
- New unit: First-time setup
- Firmware: MK4 firmware & updates (PVS)
Firmware & updates (quick)
- Check build: Settings → System → About device / About tablet, note build for PVS if asked.
- When it’s relevant: App + cable + pairing fixes failed, or PVS targeted your build - see full update guide (not step one).
- Safe rules: PVS packages only; engine charging; don’t pull USB mid-flash.
- Stop - contact PVS: Unofficial images, loop after flash, smell/heat.