Error codes on the RRE Reflex are 4 digit X : ****

Whats the full error code?

Will the truck drive / operate in limp home mode?

Truck switched OFF
Press the I button
Press the GREEN button

Truck should now start up in limp home mode, see if it allows you drive / operate it.

ONLY if its got software version 10 or newer installed you will also need the pin code / key / keyfob the truck to start it.

Do you have a BT can service key as these allow you in to the diagnostic / service hidden menus of the truck.

I look after a fleet of RRE's & they very rarely give any trouble, not had one breakdown for a few months.
Apart from service time they never seem to be in the workshop.