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Clifford Matrix Responder LE 420.4X (4204/X)

Super Code 2-Way Responder LE Vehicle Remote Start Keyless Entry System w/ 5-Button 2-way Remote


Most Vehicles Require an Immobilizer Bypass to Add a Remote Start System
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Clifford Matrix 4806X

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Clifford Matrix Responder LE 420.4X (4204/X)

Super Code 2-Way Responder LE Vehicle Remote Start Keyless Entry System w/ 5-Button 2-way Remote


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Start Your Car from the Parking Lot

Start your car from up to 2000 feet (over 1/4 of a mile!) away with the Clifford 4204X remote start system. In addition to the remote start function, this system includes keyless entry while being compatible with the Directed SmartStart system. With 2 convenient 4 button LED remotes, the 4204X 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.



420.4X Features:

  • 2-Way Responder LE Keyless Entry and Remote Start System
  • Not sure which model is right for you? Click Here to compare different Clifford models
  • 2000 ft. range
  • Includes one 5-button 2-Way remote and one 5-button 1-Way remote control
  • Directed SmartStart Compatible:
  • 24-Channel keyless entry with optional progressive driver's unlocking
  • Control Center with integrated status LED indicators and valet switch
  • Virtual Tach RPM Sensing
  • Integrates with OEM Security systems and alerts you to any triggers to your security system
  • On-board flex relays for remote start and light flash
  • Manual transmission mode
  • Advanced remote start functions: timer start, smart start, runtime reset
  • Trunk release plus 3 Auxiliary outputs
  • Optional anti-grind
  • Take-over mode
  • Built-in turbo timer
  • Full-command capability for two vehicles
  • Temperature check display the internal cabin temperature inside the vehicle
  • Valet take-over allows the vehicle to remain running after the key has been removed from the ignition
  • 1-year warranty

Replacement / Additional Remote Options:

Clifford Model Comparison

Model Security Remote Start Keyless Entry 2-Way Main Remote Type Range Secondary Remote Trunk Pop SmartStart Compatible
CS5000 Phone USA 4-Button, 1-Way Included
5606X/5904X LED Screen 1-Mile 5-Button, 1-Way
5706X/5704X LCD Screen 1-Mile 5-Button, 1-Way
5806X 5 Button LEDs 1-Mile 5-Button, 2-Way
5606X/5104X 5-Button 2000 Feet 5-Button, 1-Way
4706X/4704X LCD Screen 1-Mile 5-Button, 1-Way
4806X 5-Button LEDs 1-Mile 5-Button
4606X 5-Button 2000 Feet 5-Button
4204X 5-Button 2000 Feet 5-Button
4105X 4-Button 1500 Feet 4-Button
3305X LCD Screen 1500 Feet 5-Button, 1-Way
3606X 5-Button 1/4-Mile 5-Button
3102X 4-Button, 1-Way 1/4-Mile 4-Button, 1-Way
3105X 4-Button, 1-Way 1500 Feet 4-Button, 1-Way
3203X 5-Button 2000 Feet 5-Button, 1-Way

Also found as: 420.4X

Product History:

Clifford 480.6X thumbnail
(newest, current model)
Clifford 420.4X thumbnail
(previous model, replaced by Clifford Matrix 4806X)
Viper 4204 thumbnail
(previous model, replaced by Clifford Matrix Responder LE 420.4X (4204/X))

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.

Security with 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.
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.

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
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”.


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.
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.

Specials with this Item

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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



Great Product

April 9, 2015

Just like anything. Once installed correctly the product will work properly. Installed it on a 2014 Sonata using a DBALL2 for convenience and works perfectly. Saved me some time by not having to hookup the tachometer signal wire, door locks, alarm or even trunk since it does it all through the data wires. Could it have been done without the bypass? Sure. But the convenience and the price simply make it worth it.

38 of 67 found this helpful

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Wausau, Wisc.

Great deal

January 25, 2015

I purchased this for my wife for Christmas this product works extremely well I have used it many times from restaurant's my job and it doesn't seem to matter were I am it always starts and is very easy to use my favorite feature is when I'm at a store I can hit the button remove the key and the vehicle remains running whether its winter to keep my vehicle warm or summer to keep it cool just put the back in and go! Thanx for your product we have been enjoying it for 2 months now very satisfied!

68 of 134 found this helpful

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Detroit Lakes, MN

Great Inexpensive Remote Start

May 19, 2015

Have installed a dozen or so of these and they are, by far, the best deal for a two-way remote start. Good range and works great with the DBALL2.

33 of 65 found this helpful

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Browse 5 questions and 11 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
Good value for a remote start with great features and great range.
Corey S on Nov 6, 2015
It was suggested by installer.
spring m on Dec 17, 2014
A good unit at a good price
Wes A on Apr 7, 2015
It was recommended by a freind
Lawrence R R on Dec 13, 2014
Does this device work on any car system. Also is it something you can install yourself or does it require professional installment. I am looking to purchase this as a gift however i want to ensure it will work on his particular model car?
A shopper on Feb 12, 2015
Best Answer: This is a universal remote starter system that will work on any vehicle that can have a remote starter installed. Odds are you will require a bypass interface module. Check directechs or Flashlogic. These are white box units that do not come with owner or installations manuals. The warranty is through sonix only.... No life time on these. Professional installation is recommended unless you have a very easy vehicle and you have electronics understanding.
Reply · Report · Dave M on Feb 12, 2015
· Add Answer · I Have This Question Too (0)
Is there a place where I can find the different abilities of the "f" button on the bottom?
I know I can find out the temperature of the inside of my car, but I don't know what the light levels mean.
Lindsey B on Dec 26, 2014
Best Answer: you can only check the temperature of the vehicle with the remote that has a screen on it. to see what you can do with the function button you can download the users manual from the manufacture and page 11 is what you are looking for.
Reply · Report · MIGUEL G on Nov 8, 2015
· Add Answer · I Have This Question Too (0)
How does this work with transponder keys?
A shopper on Nov 25, 2014
Best Answer: you will need a bypass module, there are several companies that offer them and some work better than others depending on the vehicle in question. few examples are DBALL2, ALCA, EVO-ALL and the list goes on.
Reply · Report · MIGUEL G on Nov 8, 2015
· Add Answer · I Have This Question Too (0)
I am looking for remote replacement only
on the grey viper plastic (easily breakable) do you carry them and how much to replace them?
vonnie s on Oct 21, 2014
Best Answer: Hello Vonnie,

Unfortunately we do not have the remote you Specifically seek, the Clifford 7251X . However, Current Viper Remotes are often backwards compatible with their systems. We ask that you contact the manufacture, with the Model number of your system, and they will provide an RPN for the compatible remote(s), link below.

Clifford 7251X
Reply · Report · Customer SStaff on Oct 21, 2014
· Add Answer · I Have This Question Too (0)

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Sonic Electronix Wiring Guide

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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: Clifford Matrix Responder LE 420.4X (4204/X)