This service bulletin addresses the issue of an incorrectly reading DEF gauge on various Freightliner truck models. It covers a broad range of trucks, including the FLA and FLB COE models, FLD Conventional, Business Class, FLC 112 Conventional, Century Class Conventional, Argosy COE, Cargo, Columbia, Coronado, Business Class M2, Cascadia, and 108SD/114SD. The bulletin offers detailed guidance for troubleshooting and resolving the DEF gauge reading issue.

The DEF Gauge Reading Incorrectly issue, denoted by the code sb4932, is a common problem experienced by Freightliner truck owners across a wide range of models, including the FLA COE, FLB COE, FLD Conventional, Business Class, FLC 112 Conventional, Century Class Conventional, Argosy COE, Cargo, Columbia, Coronado, Business Class M2, Cascadia, and 108SD/114SD. This issue primarily affects the DEF (Diesel Exhaust Fluid) gauge, which displays an inaccurate reading on the dashboard, often indicating low DEF levels even when the tank is full. The problem can stem from a variety of factors, including faulty DEF sensors, wiring issues, or software glitches within the truck's electronic control unit (ECU). A malfunctioning DEF gauge can lead to significant consequences for truck owners. Firstly, an inaccurate reading can cause the truck to enter "limp-home" mode, restricting its performance and potentially causing delays in deliveries. Secondly, if the DEF system malfunctions, it can trigger fault codes and trigger the "Check Engine" light, leading to costly repairs. Moreover, inaccurate DEF readings can result in fines or penalties imposed by regulatory agencies for non-compliance with emission standards. Addressing this issue promptly is crucial to ensure optimal performance, maintain compliance, and prevent potential operational disruptions.