2978 SPN Fault Code

Name:

Estimated Engine Parasitic Losses � Percent Torque

Description:

The calculated torque that indicates the estimated amount of torque loss due to engine parasitics, such as cooling fan, air compressor, air conditioning, etc. It is expressed as a percent of Engine Reference Torque.If there are multiple devices on a network that provide this parameter, then users of this data shall add each of these values to determine the total torque loss due to engine parasitics. Devices that provide this parameter shall use the value of Engine Reference Torque transmitted by the engine during the current key cycle to determine the percent torque loss as seen by the engine. When the data value of this parameter is equal to FBh it means that all parasitic losses calculated by the engine are included in the Engine�s Nominal Friction Percent Torque (SPN 514). Note: Refer to section 5.2.1 in SAE J1939-71. Note: Beginning in 2016, HD-OBD requires reporting of engine torque to Portable Emissions Measurement System (PEMS) equipment that is representative of torque as measu

2978 spn fault code name is Estimated Engine Parasitic Losses � Percent Torque. If you don't take the time to look into 2978 spn fault when it arises, it can add up quickly. One small issue like 2978 can cause a larger component to become damaged without taking the time to investigate. If you suspect your truck is suffering from one of these issues, look into replacing those small components to save money down the road.

Note: The name and description of 2978 code represents text descriptions for faults supported by another coding system and does not necessarily comply with SAE J1939. For a specific engine manufacturer's explanation for codes, please consult the engine's technical manual. See also other spn codes.

2978 SPN Fault Code

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