Autopilot Features Temporarily Limited Due to Inattention
What does TESLA-AP_W164 mean?
The TESLA-AP_W164 (Tesla Autopilot Controller (AP)) EV fault code means: Autopilot Features Temporarily Limited Due to Inattention. This is a moderate severity code.
Common Symptoms
- Touchscreen displays a yellow banner: 'Autosteer unavailable for the rest of this drive' or similar
- Autopilot engage stalk or button press does nothing or shows a grayed-out icon
- Traffic-Aware Cruise Control may still work but Autosteer is blocked
- Car gave repeated hands-on-wheel warnings with escalating chimes before this code appeared
- After parking and restarting, some Autopilot features come back but Autosteer may remain blocked for a full drive cycle
- Autopilot icon on the instrument cluster shows as unavailable or dimmed
- Driver-facing camera alert may appear indicating the system flagged inattentive behavior
Probable Causes (Ranked by Likelihood)
- Driver ignored multiple escalating hands-on-wheel warnings during an Autosteer session, triggering the automatic feature lockout Very Likely
- Driver-facing camera (cabin camera) detected eyes-off-road or head position indicating distraction, triggering the attention monitoring lockout Very Likely
- Autosteer was engaged on a road type (unmapped, construction zone, sharp curve) where the system detected control limits and disabled itself after a near-intervention event Likely
- Accumulated warning strikes across multiple drives reached the threshold that triggers a longer suspension period rather than a per-drive lockout Likely
- Temporary Autopilot software glitch or CAN communication hiccup between the AP computer and VCFRONT causing a false lockout state Possible
- Recent over-the-air software update changed attention monitoring sensitivity thresholds, making previously acceptable behavior trigger the warning Possible
- Steering column sensor intermittently not detecting hands on wheel even when hands are present, causing false inattention detections Less Likely
Step-by-Step Diagnostic Procedure
Check the touchscreen notification panel for the exact message text. Tesla typically displays whether the lockout is 'for the rest of this drive' or 'until your next drive.' This tells you whether a simple park-and-restart will clear it.
Open the Tesla service menu by long-pressing the brake pedal and pressing the passenger-side wiper button simultaneously (method varies by software version), or use Scan My Tesla with an OBDLink MX+ or Veepeak adapter to read active AP fault codes and confirm AP_w164 is the only AP code present.
Check Controls > Autopilot on the touchscreen and look at your Autosteer warning strike count if visible. Tesla shows a small strike indicator. If you are at three strikes you will be locked out for the remainder of that drive.
Park safely, shift to Park, open the door to fully end the drive session, wait 2 minutes, then re-enter and start a new drive. Autosteer should re-enable if the lockout was drive-session-only.
If the lockout persists across multiple new drive sessions, perform a soft reboot by holding both scroll wheel buttons simultaneously until the screen goes dark and restarts. This clears transient AP software states.
Inspect the cabin camera (located above the rearview mirror on the windshield header). Make sure it is clean and unobstructed. A dirty or sun-occluded cabin camera can cause false inattention detections.
Verify your steering wheel torque sensor is working correctly. While driving slowly in a parking lot with Autopilot off, briefly rest your hands lightly on the wheel and check if the car acknowledges hand presence during any assisted mode. Persistent false 'hands off' detections suggest a steering column sensor issue, which requires a shop visit.
If faults persist beyond a reboot and clean camera, use Tesla Toolbox 3 (dealer-only) for a full AP diagnostic snapshot, or schedule a Tesla Service appointment via the app, as repeated false lockouts from a hardware fault need Tesla-level CAN data review.
Frequently Asked Questions
What does Tesla code AP_w164 mean?
It means the Autopilot system has temporarily disabled Autosteer because you either ignored too many hands-on-wheel warnings during a drive or the cabin camera detected you were not paying attention. It is a built-in safety lockout, not a hardware failure.
Can I still drive the car with AP_w164 active?
Yes, the car drives completely normally. You just cannot use Autosteer for the duration of the lockout. Traffic-Aware Cruise Control may still be available depending on the software version and how the lockout was triggered.
How do I clear AP_w164 and get Autopilot back?
If the message says 'for the rest of this drive,' parking and fully ending the drive session then restarting will usually restore Autosteer. If it persists, try a soft reboot by holding both steering wheel scroll buttons until the screen restarts. If it keeps returning, check your cabin camera for obstructions.
How much does it cost to fix?
Usually nothing. Most AP_w164 lockouts clear on their own after a drive cycle. If a hardware issue like a faulty steering torque sensor is causing false detections, expect $150-$600 depending on whether you use an independent EV shop or a Tesla Service Center.