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Viper Responder One 4205V

2-Way Remote Start System w/ Keyless Entry

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List price $299.99

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Viper Responder One 4205V

2-Way Remote Start System w/ Keyless Entry


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Start Your Car from the Parking Lot

Start your car from up to 2000 feet (almost 1/2 a mile!) away with the Viper 4205V remote start system. In addition to the remote start function, this system includes keyless entry and 2-way paging functions while being compatible with Viper's SmartStart system. With convenient dual Responder One 2-way remotes with LED confirmation, the 4205V remote start is the perfect solution to your hot summers, cold winters and early mornings!

Remote Start Car Alarm

Remote Start

Allows a vehicles engine to active without physical contact from the user. This feature is useful for warming up your vehicles engine and transmission to operational temperatures. In cold climates you can have your interior hot or in warm climates you can cool it down before use. All of this can be done while in the comfort of your home or office.

Keyless Entry

Keyless Entry

Performs lock and unlock tasks without physical contact with the vehicle. Power door locks can be controlled from several feet away or even within a building using a remote fob. The fob emits a radio frequency that is digitally encoded to prevent frequency stealing so no one can enter into your vehicle without your wireless transmitter.

2-Way Paging

2-Way Paging

Send commands to your remote start or alarm system and receive confirmation that those commands were carried out. Obtain updates on your vehicles security status and get driver pages on the remote. If your vehicle is being tampered with, your remote transmitter will warn you and set off the vehicles alarm.

Viper SmartStart


Gives you complete control your vehicle's security and remote start system from your smartphone with the free downloadable SmartStart app. SmartStart eliminates the need of additional keychain remotes and as long as you in an area with cellphone reception, you don't have to worry about being in range of your vehicle.


General Features:
  • 2-Way remote start system
  • Not sure which model is right for you? Click Here to compare different Viper models
  • Range: 2000 feet
  • Keyless entry unlocks car while running
  • SuperCode encryption allows for multi-car operation from one remote
    • Supports 2 vehicles
  • Parking light flash
  • Extreme capacity relays (XCR) onboard
  • Includes defroster output
  • Single button transmitter with LED display
    • 1-button sidekick remote control transmitter
  • Viper SmartStart Compatible:
  • Virtual Tach™ RPM sensing
  • Horn honk
  • 1-year Sonic Electronix Warranty

Viper Model Comparison

Model Security Remote Start Keyless Entry 2-Way Main Remote Type Range Secondary Remote Trunk Pop SmartStart Compatible
VSS5000 Phone USA 4-Button, 1-Way Included
VSS3001 Phone USA None Included
5906v/5904v LED Screen 1-Mile 5-Button, 1-Way
5706v/5704v LCD Screen 1-Mile 5-Button, 1-Way
5806v 5 Button LEDs 1-Mile 5-Button, 2-Way
5606v/5104v 5-Button 2000 Feet 5-Button, 1-Way
4706v/4704v LCD Screen 1-Mile 5-Button, 1-Way
4806v 5-Button LEDs 1-Mile 5-Button
4606v 5-Button 2000 Feet 5-Button
4105v 4-Button 1500 Feet 4-Button
4115v Unlock ONLY 1-Button 1/4 Mile 1-Button, 1-Way
4205v Unlock While Running 1-Button LED 2000 Feet 1-Button LED
3305v LCD Screen 1500 Feet 5-Button, 1-Way
3606v 5-Button 1/4-Mile 5-Button
3102v 4-Button, 1-Way 1/4-Mile 4-Button, 1-Way
3105v 4-Button, 1-Way 1500 Feet 4-Button, 1-Way
3203v 5-Button 2000 Feet 5-Button, 1-Way

General Features

Security System Type
This indicates whether the product is a security car alarm product, remote start module, or a combo unit that offers security with remote start features.

Security: This means that the car alarm system is just that. No bells and whistles, just a car alarm system.

Remote Start: when installed, this allows the user to start a vehicle from a remote location. Remote start modules and security with remote start alarms often require an additional vehicle specific bypass module to complete installation.

Security with Remote Start: This means that the system incorporates both features listed above.

Remote Start
Car Alarm
If "Yes", the system will have alarm security features to help prevent vehicle theft and tampering. Remote start modules without alarm features will have "No" for this value.
Remote Start
If the alarm or remote start module has "Yes" for this value then the system has an electronic device that allows you to start your vehicle by remote control without actually being inside the vehicle or using the key. The remote start system supplies the vehicle with power and simulates a start just as if you were inside using the key. Select vehicles require additional accessories or immobilizer/bypass modules to use the remote start feature.
Keyless Entry
Keyless entry allows you to remotely lock, unlock, and open the trunk of a vehicle if that is equipped with power door lock motors (actuators) and power truck motor (solenoid). Door lock controls via the remote are found on nearly all of today's car alarms.
2-way Paging
Alarms with 2-way paging inform the user via remote vibrating/audible/visual alert when the alarm is triggered. The pager must be within range to receive the transmitted signal.
Number of Remotes
The number of remotes included with the alarm system purchase.
Number of Buttons on Primary Remote
The amount of buttons on the Primary Remote generally equals the number of functions that you can use your remote for. Some remotes have auxiliary buttons which can perform more than one task per button.
Main Transmitter Type
LCD and OLED transmitters display various screen savers, warnings, alerts and other features on the face of the remote, rather than first generation button-only transmitters. They provide more information typically and other features.
Sidekick Remote Transmitter Type
Some car alarms and remote start systems come with more than 1 transmitter, which is referred to as the "sidekick" transmitter. Most LCD/OLED systems come with a button-only sidekick transmitter, while select units come with an additional LCD/OLED transmitter.
LED/Display Color
The color of the LED indicator(s) on various items such as button-only car alarm transmitters, various chargers, cell phone accessories and other products.

For OLED or LCD car alarm remotes/transmitters the display color refers to the color(s) of the screen.
Number of Vehicles Supported
Some higher end car alarm systems can support multiple vehicles. This is the number of vehicles that the works with.
Number of Auxiliary Outputs
The number of auxilary outputs that the car alarm system supports. These outputs are left over from the total number of channels. They can be used to add on other options or additional features to a vehicle.
PC Programmable
Custom, advanced programming options through one or more of the following: PC, Pocket PC, PALM Pilot, Valet SW or Remote Transmitter allows for advanced controls of your alarm's functions.
Smartphone Compatibility
These are the types of smartphone systems that the car alarm system is compatible with.
GPS Tracking
These car alarms enable a user to track the position of the vehicle using GPS satellites.
Professional Installation Recommended
This will indicate whether or not we recommend going to a professional installer for this item. Some items have complex installations that should only be done be professional certified installers.
System Type
This refers to the type of remote start system, whether it is an add-on or a complete kit.
Add-On System

Convenient Features

Panic Mode
Panic mode allow the user to be able to set off the alarm from the remote.
Trunk Release
The trunk release option allows for integration and control of the trunk latch. Additional parts may be required.
Valet Mode
Valet mode is a car alarm setting that adjusts system to less sensitive settings when allowing a valet to park your car and similar settings.

Alarm Features

Paging Range
The maximum distance that the car alarm system will work with the wireless remotes.
2,000 Feet
Number of Car Alarm Channels
The total number of channels that the car alarm system supports. These channels can include locking and unlocking doors, opening the trunk, remote start, and many other options.
Most car alarms come with a siren that can be installed. The siren will sound when the car alarm is triggered the alarm goes off.
Shock Sensor
The shock sensor is designed to trigger an alarm on light or heavy impacts and vibrations (standard sensor included with most alarms).

A dual zone shock sensor is a feature of proximity and shock sensors only. Zone 1 ( light impact on shock sensor and short motions(adjustable) on proximity sensor) will trigger warn away chirp to warn intruder that car has an alarm without setting off the full alarm. Zone 2 (heavy impact on shock sensor and extended motions(adjustable) on proximity sensor) will trigger the alarm to “go off”.

Two-Way Paging Features

Transmitter Alert
The is the way that the transmitter, or remote can communicate alerts to the user.
Interior Thermometer
Some of the higher end car alarm systems are able to detect the temperature of the cabin. The temperature can then be displayed on the remote.

Remote Start Features

Cold Start Timer
Great for those on a set schedule who need their vehicle to warm up at a specific time every morning for example.
Turbo Timer
Some remote start systems have turbo timer feature which allows the vehicle to run for a specified amount of time after exiting vehicle. In turbocharged vehicles this prevents hot oil in the engine from choking up in the lines. Hard driving can raise engine oil temperatures to dangerously high levels. Proper cool down is essential for a healthy turbo and engine.
Compatible with Diesel Engines
This means that the remote start system will work with diesel engines.
Engine Start Intervals
Some remote start systems offer feature to protect your engine. The engine start interval feature will start the car at particular time intervals or when the engine has reached a certain temperature. This feature prevents the engine block from freezing.
Compatible with Manual Transmissions
This means that the remote start car alarm is compatible with manual transmissions. Please see the item description, manual, or your professional installer for more information as to how this feature will work with your specific vehicle.

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Pinckney, MI


October 20, 2014

I would highly recommend this product. A simple, no frills product that performs as advertised!

28 of 65 found this helpful

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Browse 2 questions and 2 answers
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Why did you choose this?
Sonic Electronix Store
To replace an older model
Ben G on Dec 9, 2014
I choose the Viper 4205v because of the 2 way range which is 2000 feet so that my wife can start her car from her office. Plus Viper makes excellent products just wish they would put an installation manual in so people who feel comfortable with installing them their self instead of having to pay an installer to do the job.
Tracy K on Oct 20, 2014
This Viper are compatible with Toyota Corolla LE 2015?
Ambro C on Sep 27, 2015
Viper 4205V
Viper 4205V
Viper 4205V RB
Viper 4205V RB
· Add Answer · I Have This Question Too (0)

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Viper Responder One 4205V