Reduced diesel exhaust fluid will trigger your vehicle to go to the Limp Mode or Reduced Engine Power Mode. If you don’t do so, the diesel exhaust fuel will reduce and cause the service DEF message. You have to refill the tank with DEF every 6000 miles. The tank is located on the front passenger seat under the hood, and the cap of the tank is blue. It is stored in a separate tank behind the engine under the hood. By Refilling DEFĭEF is not a fuel additive or fuel cleaner. Let’s discuss these 04 methods in detail. There are 04 ways to clear the service DEF message, including adding DEF, scanning with an OBD scanner, disconnecting the negative battery terminal, and disconnecting the ABS sensor. How to Clear Service DEF System Message Duramax How to Clear Service DEF System Message Duramax.
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