Lack of Performance in High Ambient Temperatures

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. (Fig. 10)


Fig. 10


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.


– Thanks to Richard Renshaw

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