If for any reason you are dissatisfied with anything purchased at the comma.ai shop, ship it back within 30 days for a full refund. comma.ai/returns

If you intend to upstream support for a new car model, we may approve an extended return window. Open a ticket request at comma.ai/support.

Free Rush (UPS 2nd Day Air) shipping (US only); signature confirmation required. International shipping is a $30 flat rate; customs/duties/taxes are between you and your country. Please see FAQ for more information.

1-year limited warranty against hardware defects. Open and repair the comma four at your own risk. comma is not responsible for damages that may occur while repairing devices. We cannot provide shipping return labels for international devices. Any damage on arrival must be reported to comma support within 14 days of delivery.

The comma four does not ship with software capable of controlling a car. Open source software can be installed separately.

Before using the device on your windshield, check the state and local laws and ordinances where you drive. Some state laws prohibit or restrict the placement of objects on the windshield of a motor vehicle. IT IS THE USER'S RESPONSIBILITY TO MOUNT THE DEVICE IN COMPLIANCE WITH ALL APPLICABLE LAWS AND ORDINANCES. Always mount your device in a location that does not obstruct the driver's view of the road. comma does not assume any responsibility for any fines, penalties, or damages that may be incurred as a result of any state or local law or ordinance relating to the use of your comma device.

Save offer within PayPal account prior to purchase here: https://www.paypal.com/us/digital-wallet/ways-to-pay/buy-now-pay-later. Expires 12/8/25. 20% on up to max $1,250 spend per transaction (max 25K points or $250). 1.5B points available in total for this promo. See paypal.com/promoterms. Points can be redeemed for cash and more. Terms and exclusions apply. See paypal.com/rewardsterms.

Pay in 4 is available to consumers upon approval for purchases of $30 to $1,500. Pay in 4 is currently not available to residents of MO. Offer availability depends on the merchant and also may not be available for certain recurring, subscription services. When applying, a soft credit check may be needed, but will not affect your credit score. You must be 18 years old or older to apply: PayPal, Inc.: Loans to CA residents are made or arranged pursuant to a CA Financing Law License. GA Installment Lender Licensee, NMLS #910457. RI Small Loan Lender Licensee. NM residents: Find more disclosures related to Pay in 4.

Pay Monthly is subject to consumer credit approval and eligibility. In store single-use card is valid for one purchase and must be used within 24 hours of loan approval. Fixed APR is 9.99-35.99%. Terms and rates vary based on purchase amount and your credit. For example, a $200 purchase can be paid at 26% APR in 3 monthly payments ($69.56/mo.; $8.68 interest; $208.68 total of payments). A $600 purchase can be paid at 26% APR in 6 monthly payments ($107.76/mo.; $46.57 interest; $646.57 total of payments) or 12 monthly payments ($57.33/mo.; $88.01 interest; $688.01 total of payments). A $1,500 purchase can be paid at 26% APR in 24 monthly payments ($80.77/mo; $438.47 interest; $1,938.47 total of payments). Payments may change based on shipping, taxes, updates to your purchase, or missed payments. Availability depends on the merchant and may not be available for subscriptions or recurring payments. Pay Monthly is currently not available to residents of AK, CT, HI or WA. You must be 18 years old or older to apply. Missed payments may have an impact on your credit score. The lender for Pay Monthly is WebBank. PayPal, Inc. (NMLS #910457): RI Loan Broker Licensee. VT Loan Solicitation Licensee. VT residents: THIS IS A LOAN SOLICITATION ONLY. PAYPAL, INC. IS NOT THE LENDER. INFORMATION RECEIVED WILL BE SHARED WITH ONE OR MORE THIRD PARTIES IN CONNECTION WITH YOUR LOAN INQUIRY. THE LENDER MAY NOT BE SUBJECT TO ALL VERMONT LENDING LAWS. THE LENDER MAY BE SUBJECT TO FEDERAL LENDING LAWS.

comma four FAQ

Do I need a comma prime monthly subscription to use the device?

Absolutely not. comma prime is completely optional and is not needed for any core functionality. comma prime can be activated, cancelled, and re-activated at any time.

Does installing a comma device require permanent modifications to the car?

Installing a comma device does not require any permanent modifications to your car. Removing the comma device leaves your car in the same state as before the installation.

How do I mount my comma device?

We recommend the mount be centered on the windshield below the trim (see pictures in the Installation Guide). Be sure to leave enough room to remove the trim in the future. First, clean the windshield with the included alcohol wipe. Ensure the top of the mount is fully visible from the driver’s seat. Adhere mount: peel off the 3M tape’s cover on the mount. Press firmly in the center of the mount, then the edges to ensure no bubbles form.

It is the user’s responsibility to mount the device in compliance with all applicable laws and ordinances.

Will installing a comma device void my warranty?

From the FTC website: "Simply using an aftermarket or recycled part does not void your warranty. The Magnuson-Moss Warranty Act makes it illegal for companies to void your warranty or deny coverage under the warranty simply because you used an aftermarket or recycled part."

https://www.consumer.ftc.gov/articles/0138-auto-warranties-routine-maintenance

Will my insurance cover my car with a comma device installed?

Contact your insurance provider directly; insurance coverage is between the user and their insurance provider. comma hardware users have been able to get coverage and discuss this on Reddit here: https://www.reddit.com/r/SelfDrivingCars/comments/b13cdp/open_pilot_and_insurance_coverage/

Insurance companies are beginning to understand the safety benefits of driver assistance systems like openpilot and we have not heard of any providers rejecting coverage to comma hardware users.

Money-back trial

30 days

What is the 30-day money-back trial?

Every vehicle is a little different and the experience can be hard to describe which is why we offer this trial. If you don’t love the comma four, you can return it for a refund–no questions asked. All refunds must be initiated through comma.ai/returns within 30 calendar days of receiving your order.

When does the 30-day money-back trial start?

The 30-day money-back trial starts the day your comma four is delivered (signature confirmation required for delivery). If you do decide to return your device, we ask that you get the return device in the mail within 30 days of receiving it.

How do I return my comma four?

To return your device, please request a return at comma.ai/returns. A prepaid return label (or return instructions if not in the US) will be automatically sent to you. $9.99 will be deducted from your refund if you choose to use this label.

Are international orders eligible for the trial?

Yes. We ask that you get your return device in the mail within 30 days of receiving it.

The buyer is responsible for international shipping costs to return a device. Please use tracking and insurance as we are not responsible for lost or stolen packages. Return information is provided by email after initiating a return at comma.ai/returns.

openpilot FAQ

What is openpilot?

comma openpilot is an open source driver-assistance system. Currently, openpilot performs the functions of Adaptive Cruise Control (ACC) and Automated Lane Centering (ALC) for compatible vehicles. It performs similarly to Tesla Autopilot and GM Super Cruise. openpilot can steer, accelerate, and brake automatically for other vehicles within its lane. Check it out on GitHub: https://github.com/commaai/openpilot

In order to enforce driver alertness, openpilot includes a camera based Driver Monitoring (DM) system that alerts the driver when distracted or asleep. However, even with an attentive driver, we must make further efforts for the system to be safe. We have designed openpilot with two other safety considerations:

1. The driver must always be capable to immediately retake manual control of the vehicle, by stepping on either pedal or by pressing the cancel button.
2. The vehicle must not alter its trajectory too quickly for the driver to safely react. This means that while the system is engaged, the actuators are constrained to operate within reasonable limits.

How does openpilot work?

openpilot works by connecting to your car's CAN network. Most modern cars accept electronic steering, gas, and brake commands to allow for driver assistance features. openpilot can use these commands to provide much better driver assistance features than the car manufacturers can provide.

Is my car compatible with openpilot?

A complete list of compatible vehicles can be found on our Compatibility page.

What should I buy to run openpilot in my car?

After verifying that your car is compatible, we recommend purchasing a comma device in our shop. Don't forget to purchase a car harness to connect it to your vehicle. Add to cart, check out, and you’re good to go!

Do I have to pay attention?

Yes, the driver must always be able to immediately retake manual control of the vehicle, by stepping on the brake pedal or by pressing the cancel button. When openpilot is engaged, a driver monitoring system actively tracks driver awareness to help prevent distractions. The openpilot system disengages if you are distracted. Drivers must keep their eyes on the road at all times and be ready to take control of the car.

What is the openpilot safety model?

More info about the openpilot safety model can be found here: https://github.com/commaai/openpilot/blob/master/docs/SAFETY.md

What are the limitations of openpilot Automated Lane Centering?

openpilot Automated Lane Centering (ALC) system does not automatically drive the vehicle or reduce the amount of attention that must be paid to the area in front of the vehicle. The driver must always keep control of the steering wheel and be ready to correct the ALC system action at all times.

Many factors can impact the performance of openpilot ALC, causing it to be unable to function as intended. These include, but are not limited to:

• Poor visibility (heavy rain, snow, fog, etc.) or weather conditions are interfering with sensor operation.
• The road facing camera is obstructed, covered or damaged by mud, ice, snow, etc.
• Obstruction caused by applying excessive paint or adhesive products (such as wraps, stickers, rubber coating, etc.) onto the vehicle.
• The device is mounted incorrectly.
• When in sharp curves, like on-off ramps, intersections etc...; openpilot is designed to be limited in the amount of steering torque it can produce.
• In the presence of restricted lanes or construction zones.
• When driving on highly banked roads or in presence of strong cross-wind.
• Extremely hot or cold temperatures.
• Bright light (due to oncoming headlights, direct sunlight, etc.)
• Driving on hills, narrow, or winding roads.

The list above does not represent an exhaustive list of situations that may interfere with proper operation of openpilot components. It is the driver's responsibility to be in control of the vehicle at all times.

What are the limitations of openpilot Adaptive Cruise Control?

openpilot Adaptive Cruise Control (ACC) is not a system that allows careless or inattentive driving. It is still necessary for the driver to pay close attention to the vehicle’s surroundings and to be ready to re-take control of the gas and the brake at all times.

Many factors can impact the performance of openpilot ACC, causing it to be unable to function as intended. These include, but are not limited to:

• Poor visibility (heavy rain, snow, fog, etc.) or weather conditions are interfering with sensor operation.
• The road facing camera or radar are obstructed, covered, or damaged by mud, ice, snow, etc.
• Obstruction caused by applying excessive paint or adhesive products (such as wraps, stickers, rubber coating, etc.) onto the vehicle.
• The device is mounted incorrectly.
• Approaching a toll booth.
• When driving on roads with pedestrians, cyclists, etc...
• In presence of traffic signs or stop lights, which are not detected by openpilot at this time.
• When the posted speed limit is below the user selected set speed. openpilot does not detect speed limits at this time.
• In presence of vehicles in the same lane that are not moving.
• When abrupt braking maneuvers are required. openpilot is designed to be limited in the amount of deceleration and acceleration that it can produce.
• When surrounding vehicles perform close cut-ins from neighbor lanes.
• Driving on hills, narrow, or winding roads.
• Extremely hot or cold temperatures.
• Bright light (due to oncoming headlights, direct sunlight, etc.)
• Interference from other equipment that generates ultrasonic waves.

The list above does not represent an exhaustive list of situations that may interfere with proper operation of openpilot components. It is the driver's responsibility to be in control of the vehicle at all times.

Do I retain my car factory safety features with openpilot installed?