P1408 GMC EGR Flow Out Of Self Test Range
Possible causes
For vacuum activated systems, see the possible causes for DTC P0401 GMC. For electric motor systems, see the possible causes for DTC P0400 GMC.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1408 GMC Description
This test is performed during the KOER on-demand self-test only. The EGR system is commanded on at a fixed engine speed. The test fails and the DTC is output when the measured EGR flow falls above or below the required calibration .
GMC Vehicle:GMC Acadia,GMC Canyon,GMC Envoy,GMC Savana 1500,GMC Savana 2500,GMC Savana 3500,GMC Sierra 1500,GMC Sierra 2500 HD,GMC Sierra 3500 HD,GMC Terrain,GMC Yukon,GMC Yukon XL 1500,GMC Yukon XL 2500,