Unit has been installed while the ECU was still active.
OR
Improper connection. Plugs did not "click" or fully lock into place.
Pedal Commander
Troubleshooting
If your check engine light appears right after installation...
Causes
Resolution
Turn off your vehicle, wait for the ECU to shut off, then uninstall the Pedal Commander unit. After, reinstall your vehicle's stock plugs and restart your vehicle. When check engine light clears, properly reinstall the Pedal Commander.
If your check engine light appears after a period of time...
Causes
Plugs were not locked in during the initial installation.
OR
Modes were changed while cruise control was engaged or foot was on the gas pedal.
Resolution
Uninstall the Pedal Commander and reinstall your factory plugs, allowing your ECU and CEL to fully reset. Once completed, reinstall the Pedal Commander following the proper installation.
If the lights on your Pedal Commander unit are not turning on...
Causes
Unit was not installed properly.
OR
Unit is not turned on.
Resolution
Check plug connection to make sure the plugs "clicked" and are locked in place.
Check engine lights can be cleared using an OBII scanner or by reconnecting your original plugs and then restarting your vehicle several times (5-6 times).