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Viper Responder One (Model 4205V)

Remote start/keyless entry system with 2-way remotes

3 Reviews | 6 questions - 7 answers

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Our take on the Viper Responder One (Model 4205V)

You can start your car from up to 2000 feet away — that's well over a quarter mile — with Viper's Model 4205V remote start system. Just push the button on the keychain remote, and your car will be warmed or cooled by the time you get to it. Each 2-way remote features an LED that lights up to confirm that your engine has started. The Model 4205V system is also compatible with any Viper SmartStart module, which allows you to start your car via your smartphone with no limit to the range.

Start your engine remotely, then get confirmation that it's running

You can start your car from up to 2000 feet away — that's well over a quarter mile — with Viper's Model 4205V remote start system. Just push the button on the keychain remote, and your car will be warmed or cooled by the time you get to it. Each 2-way remote features an LED that lights up to confirm that your engine has started. The Model 4205V system is also compatible with any Viper SmartStart module, which allows you to start your car via your smartphone with no limit to the range.

Push to start and keyless entry vehicles

The Model 4205V system works well with push-to-start (PTS) vehicles and those with keyless entry systems that use the head of the key as a transmitter. The factory keyless entry systems in many vehicles won't work after the car's been remotely started, so the 4205V includes an unlock feature to bypass that situation. You'll hardly notice the 4205V's compact remote on your keychain, but you'll really appreciate the convenience that this easy-to-use one-button remote will bring to your lifestyle.

Important Note:
We offer a databus interface module that can save you lots of time when you install a Viper remote start system in most vehicles. Chat or call us at 1-888-955-6000 to see if the interface will work with your vehicle.

If you know how to use a multimeter and have experience working with your vehicle's electrical system, you should be able to install this remote start system yourself. If not, please consider having your system professionally installed by purchasing an InstallCard.

To ensure vehicle compatibility, please enter your vehicle information in OutfitMyCar. Your order will be reviewed by our Car Experts group, who will contact you if further information or recommended accessories are needed.

Product Highlights:

  • remote start system
  • remote start function is for fuel injected, diesel, and hybrid vehicles with automatic transmissions only
  • two 1-button 2-way transmitters — up to 2000-foot range
  • can unlock car after remote start (no lock function)
  • Car Finder flashes lights five times slowly (only functions when not remote started)
  • SuperCode® encryption protocol technology for added security
  • optional Viper 7211V remote available as replacement
  • compatible with XpressKit DBALL2 vehicle interface module and all Viper SmartStart smartphone modules
  • D2D port for direct interface connection
  • warranty: limited lifetime
  • Our 60-day money-back guarantee

this product works great for our fleet units and very easy to install.

Anonymous, Ohio

What's in the Box:

  • Control module (with 3-pin jumper taped to top)
  • Two 7211V 1-button transmitters (each with two CR2016 batteries installed)
  • Self-adhesive antenna/receiver
  • Main harness (9-pin) with 36" leads and in-line 10A ATO fuse
  • Door lock harness (3-pin) with two 59" leads
  • Heavy-gauge remote start harness (6-pin) with 24" leads and 2 in-line 30A ATO fuses
  • Satellite harness (4-pin) with 6" leads
  • H3 Remote start harness (5-pin) with 36" + 98" leads
  • 10' Antenna/receiver flat black cable (with 4-pin connectors on each end)
  • Shut-down toggle switch with attached 18" leads (no connector)
  • Valet switch with 6' leads (2-pin connector)
  • Pin switch (with 0.25" male quick slide)
  • 0.25" Female quick slide
  • Warning Sticker
  • Owner's Guide
  • Quick Reference Install Guide
  • 2 Viper stickers
  • SmartStart promo card
  • SmartStart reminder

Viper Responder One (Model 4205V) Reviews

Average Customer Review(s):

(3 Reviews)

Great remote start

Michael from Wellington, CO on 2/7/2016

2014 Kia Forte
Crutchfield Customer Review (What's this?)

Bought this for our 2014 Kia Forte. The range is awesome because I can start the car from my desk on the third floor almost a block away and the confirmation tone you get to let you know the car started is an added bonus. I am looking into having this same system put into my 2014 F150 XLT even though it has factory remote start. I can't even start my truck from 40' away with clear line of sight so the range sucks and I also don't get confirmation the truck started unless I can see the taillights.

Pros: Great range Confirmation the vehicle started Reasonable price Small remote so key ring isn't bouncing around while in ignition

Cons: None so far


Vicky from Virginia on 1/12/2016

2005 Toyota Tacoma
Crutchfield Customer Review (What's this?)

I'm finding it very hard to use the remote

Pros: Nothing to say

Cons: Buttons are not friendly

Viper Responder One (Model 4205V)

Anonymous from Ohio on 1/5/2015

2014 Chevrolet Express
Crutchfield Customer Review (What's this?)

this product works great for our fleet units and very easy to install.




Hands-on research

Product Research

General Features
Remote Starter Features
Keyless Entry Features

General Features

Overview: The Viper Responder One 2-way Remote Start and Keyless Entry system (Model 4205V) can start your car and run it by remote control from a distance of up to 2000 feet for a preset amount of time. It will also function as a keyless entry system, but only after the vehicle is remotely started via the transmitter. The Model 4205V does not provide car security.

Note: The remote start function is for fuel injected, diesel, or hybrid vehicles only.

One-button Remotes: The Model 4205V includes two 1-button transmitters (7211V) with 2-way operation. The single button controls all of the functions of the system, including starting the vehicle, and unlocking the doors. The LED on the remote gives you confirmation that your car has started. The 7211V remotes are powered by two CR2016 batteries (installed).

Responder One: This Responder One system offers one-button remote start with a range of up to 2000 feet. The 2-way system provides confirmation back to the remote's LED, so you will know the status of your vehicle.

SuperCode: The system includes SuperCode technology for a more secure operation. The system's signal encryption protocol is based on software, which is superior to the hardware-based Clone Safe Code-Hopping found in other models. SuperCode technology also lets you control the operations of two cars by a single, one-button remote.

D2D Port: The Model 4205V's control module has a D2D port that will allow you to plug in an XpressKit vehicle interface. XpressKit interfaces are vehicle-specific, and can greatly reduce installation time by interfacing with your vehicle's factory wiring. Check the Crutchfield Vehicle Selector to see if an XpressKit interface is available for your vehicle.

ESP Port: The 4205V includes a dedicated 3-pin ESP port for connecting an optional Viper SmartStart module. This is an improvement over last year's model (4203V) which had one port that allowed either D2D or ESP functionality. The separate ports allow you to plug in an XpressKit vehicle interface (see D2D port above) and a SmartStart module at the same time.

SmartStart Compatible: The optional Viper SmartStart module lets you start, control, or locate your car from virtually anywhere with your smartphone. Available SmartStart modules include the VSM200, VSM250 (with GPS), and VSM50BT (with Bluetooth).

Car Finder: If you're having difficulty finding your vehicle in a crowded parking lot, the car finder function will cause the lights to flash 5 times slowly, allowing you to locate your vehicle.

Panic Mode: If you are threatened in or near your vehicle, you can attract attention by triggering the system with your remote. Panic mode requires the horn honk circuit to be connected.

Rapid Resume Logic: This Viper remote start system stores its current settings in non-volatile memory. If power is lost, the system will recall the stored settings from memory when power is restored.

Remote Starter Features

Remote Starting: Pressing the transmitter button on the remote for a second will remotely start the vehicle and run it for 12 minutes. You can extend the run time to 24 or 60 minutes. If you wish to pre-heat or pre-cool the vehicle, you must preset the climate controls prior to starting the vehicle. When you are ready to drive the remotely-started vehicle, insert the ignition key, turn it to the On position (not Start), and press the brake pedal.

Crank Time: If the unit is programmed for no engine checking or voltage sense, the crank time must be set to the appropriate duration. The default setting is 0.6 seconds. It can be lengthened to 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, or 4.0 seconds.

Diesel "Wait To Start" Timer: If you have a diesel vehicle, you can set the starter to delay by a few seconds before engaging. The "wait-to-start" duration can be set to 15, 30, or 45 seconds. Gasoline engines will start approximately 4 seconds after the system acknowledges the start command by flashing the parking lights.

Pit Stop: This feature allows the vehicle to remain running after the key has been removed from the ignition. This is useful for those occasions when you wish to exit and lock the vehicle for short periods of time while leaving the motor running and the climate controls on.

Automatic Shut-down/Starter Lockout: After the vehicle is remote-started, the remote starter will shut down when the brake pedal is pressed, the hood is opened, if the run time expires, or when the remote start command is sent again from a remote control. In addition, if the hood is opened or if the brake pedal is pressed, you cannot start the vehicle using the remote starter.

Anti-grind Circuitry: Whenever the vehicle is started using the remote, advanced anti-grind circuitry prevents the starter from being engaged using the key. (In other words, it won't let you try to start the car with the key if the remote starter has already been engaged.) This prevents damage to the starter motor. The optional Failsafe Starter Kill relay must be installed in order for the anti-grind circuitry to work.

Shutdown Switch: You can temporarily disable the remote start unit to prevent the vehicle from being remote started accidentally by switching the supplied neutral safety toggle switch to the Off position.

Keyless Entry Features

Unlocking The Vehicle: The Model 4205V will remotely unlock the vehicle's doors only after the engine has been remotely started via the transmitter. The system can be programmed to lock and unlock the doors as the ignition it turned on or off. If connected and programmed, the power doors will lock three seconds after the ignition is turned on, and unlock when the ignition is turned off. The lock and unlock functions are separately programmed.

Note: When interfacing with any other type of factory door lock system besides negative switching locks, or when adding aftermarket actuators, two relays (such as two120E5000s) or a door lock module (607451M) will be required. If your vehicle requires the use of a Data Integration module that controls your factory door locks, no extra parts besides the Data Integration module will be required.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

6 questions already asked

It can work with diesel engines.[ Paul  Dec 07, 2015 ]  Staff
Yes you can make it work with a manual transmission, I would not recommend it. The car doesn't know what gear it is in on a manual transmission so if you accidentally leave it in gear the car will still try to start and if the E-brake is not on I have seen vehicles start and crash[ SEAN  Aug 23, 2015 ]
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.[ Krissy  Jul 31, 2015 ]  Staff
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.[ Jeff  Mar 25, 2015 ]  Staff
NathanI purchased this unit at xmas, but had to return it. The door lock feature only works when you have remote started it. It will not unlock or lock vehicle if it is not running. Salesman didn't know that until I brought it up for technical adviceMatt[ MATTHEW  Feb 04, 2015 ]
by pressing firmly on the single button remote. press and hold it for a moment and it activates the remote start, once the vehicle has received the signal, the remote flashes and chimes to indicate the vehicle is running.[ Kevin  Dec 17, 2014 ]
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question.[ Jeff  Feb 17, 2014 ]  Staff