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Finding Aftermarket equipment on vehicles

Article ID: 475
Last updated: 20 Mar, 2014


ECU Flash Reprogramming and Diagnostic Routine failures have been known to be caused by aftermarket equipment installed on a vehicle. If an ECU flash reprogramming session or routine fails repeatable and all procedures in DealerCONNECT have been followed check for aftermarket equipment installed.

Aftermarket equipment includes but is not limited to the following:

  • Radios
  • Remote Start Systems
  • Alarm Systems
  • Lights
  • Tuners


  • Check the vehicle for any aftermarket equipment. 
  • Checking for aftermarket equipment involves but is not limited to the following:
    • Check under the hood for any aftermarket devices.
    • Check under the instrument panel (IP) for any aftermarket equipment devices or wiring.
    • Check for aftermarket key fobs that may have been provided by customer.
    • Ask the customer if they use aftermarket equipment or have had any installed.
  •  If aftermarket equipment is found on vehicle, check for an inline fuse or module that can be disconnected easily, then restart the ECU flash reprogramming process.  

Note: There have been cases where complete aftermarket equipment removal has been required to ensure a successful ECU flash reprogramming session.    

Article ID: 475
Last updated: 20 Mar, 2014
Revision: 3
Views: 4340
Comments: 0
Posted: 17 Mar, 2014 by Maynard R.
Updated: 20 Mar, 2014 by Maynard R.
This article was:   Helpful | Not helpful
Also listed in
folder Vehicle/Diagnostic Tool Applicability -> Vehicle Routines

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