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This 2020 GMC Sierra incurred complaints about the following:  Check engine light on, temperature sensor, climate control screen blank. Parts that required diagnosis, adjustment, repair or replacement are:  Reductant pump control circuit, emission reduction fluid tank, code P208C, P249C. pump module, Code P0071, ambient air temp sensor, Code P0421.  Fuel injector small reset, circuit system testing.  In […]