#3969 - 07/20/1705:21 PM Lack of Performance in High Ambient Temperatures
Joined: Dec 2000 Posts: 5,843teamzr1 Owner - Pays the bills
teamzr1 Owner - Pays the bills Lives in Engine Bay
Joined: Dec 2000
Posts: 5,843
America
Some 2013-2017 GM models may have a lack of performance in excessively hot and sustained ambient temperatures over 100° F (37.7° C) due to vapor buildup in the fuel feed line. DTCs P2635 (Fuel Pump Flow Performance) and P018B (Fuel Pressure Sensor Performance) may be set.
If the vehicle has not had a fuel pump replaced, refer to #PIP5411 for additional diagnostic information. It may be necessary to replace the fuel tank fuel pump module assembly.
If the vehicle has had a fuel pump replaced, advise owners to use fuels with an octane rating higher than 91 and to refrain from periods of extending idling, if possible.
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