SERVICE DEF SYSTEM SEE OWNERS MANUAL DRIVER
SERVICE DEF SYSTEM SEE OWNERS MANUAL CODE

Service Emission System (Not-Tamper) вЂ“ Displays when a DTC sets related to the DEF system that is interpreted as an Emission Control fault.

SERVICE DEF SYSTEM SEE OWNERS MANUAL CODE

Service Exhaust Fluid System (Tamper) - Displays when a Diagnostic Trouble Code (DTC) sets related to the DEF system that is interpreted as tampering with the system.

The DEF messages displayed on the DIC depend on the operating conditions of the engine.

If the vehicle is not in any warning strategy, it will be displayed as None. The vehicle's current DEF warning level is displayed on the scan tool as Reductant Level Warning Indicator Command Level 1 through Level 9. Once initiated, DEF warnings grow increasingly more serious as the remaining mileage decreases without a DEF refill.

SERVICE DEF SYSTEM SEE OWNERS MANUAL DRIVER

Typically, DEF warnings are displayed on the Driver Information Center (DIC) beginning once the estimated mileage falls below 1609.34 kilometres. The ECM monitors the DEF level and consumption rate in order to calculate an estimated range in kilometres remaining until the DEF reservoir is empty. A series of prompts and warnings are initiated when the DEF level falls below a calibrated value to ensure the vehicle remains compliant to emission regulations. The injected DEF mixes with the exhaust gas before contacting the SCR system.ДЄn adequate supply of DEF is critical for the reduction of NOx levels and to maintain proper after-treatment system operation. The Engine Control Module (ECM) controls the DEF delivery system based on engine NOx emission levels and NOx sensor feedback. The urea is quickly hydrolyzed to produce oxidizing ammonia. The reducing agent is automotive-grade urea, or DEF, that reacts with NOx to convert the pollutants into nitrogen, water and trace amounts of carbon dioxide. It's called selective because it uses ammonia to reduce NOx levels as a reductant within a catalyst system. SCR technology permits NOx reduction to occur in an oxidizing atmosphere. The Duramax diesel engine exhaust after-treatment system reduces oxides of nitrogen (NOx) using a Selective Catalyst Reduction (SCR) system, a DEF injection system, and two NOx sensors and smart module assemblies. However, it is slightly alkaline, which means it's corrosive to metals. DEF is naturally occurring and biodegradable.

DEF is a colourless, clear solution of water and nitrogen-based urea product that has 32.5 percent urea by weight. The Duramax diesel engine available on 2011-2016 GM full-size trucks and vans requires injection of Diesel Exhaust Fluid (DEF) as an integral part of the exhaust after-treatment process that reduces emissions.

Service def system see owners manual