Prefix Viper Gen IV Race Engine Controller

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  • Regular price $1,400.00

Prefix Corporation announce a new Engine Control Unit now available for the 2008 – 2010 Gen IV Viper – PN PFX-S1G41109AA. The new PCM is available and will be more robust to allow owners to run most typical racing modifications without limp-outs or MIL’s. This flash is intended for off-road use only and will have the following changes/improvements compared to the previous Mopar off-road controller:

  • Improved throttle response and feel and a more aggressive pedal map
  • Misfire monitor disabled which will allow use of other engine and driveline changes without false misfire detection
  • Airflow rationality monitor disabled which will allow changes to air cleaners, ducts and filters, hood scoop and other inlet side modifications without limp-out
  • Temperature rationality disabled to prevent MIL’s due to changes to the cooling system, oil cooler or oiling system
  • Leak detection system disabled to allow use of fuel cells without LDP MIL’s
  • Rev limit increased to 6600 rpm for track use
  • More aggressive exhaust note on deceleration (i.e. popping)

 Several fault codes will be set due to the re-flash and will require the owner to clear the faults (although the faults will clear after a number of trips on their own) 


 Not legal for use on pollution-controlled vehicles, or vehicles registered for highway use.  Installing this kit for use in certified on-highway vehicles is illegal and constitutes a violation of the Clean Air Act subjecting the installer to a civil penalty of not more than $25,000.


Requires min 93 octane fuel.


PREFIX Recommends professional installation by an ASE certified technician.  Specialized removal and installation tools may be required including use of an appropriate Scan tool to set up the Powertrain Control Module.



Prefix Corporation parts are sold “as is” unless otherwise noted.  This means that parts sold by Prefix Corporation carry no warranty whatsoever.  Implied warranties, such as warranties of merchantability, are excluded.  (An implied warranty of merchantability means that the part is reasonably fit for the general purpose for which it was sold).  The entire risk as to quality and performance of such parts is with the buyer.