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P0172 Diagnostic Trouble Code Discussion for April 2019

Fuel System Rich (Bank 1)

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Trouble Ticket Help Requests for DTC P0172
Help Request Posted
2010 GMC Terrain SLE 2.4L Poor Idle Quality, Poor Idle Quality VIN: 2CTALDEW2A
P0172: Fuel trim system rich. ... light on. I check the codes, p0172, and p0300. I scan the data and st. Fuel trim varied from -2 to-25. Lt fuel trim varied -25 to -50. Mass air flow at idle 3.6 grams per sec. Wide open throttle, went over 65 grams per sec. O2 sensors were working and...
April 29, 2019