P209C GMC - Reductant Injection Air Pressure Sensor 'B' Circuit Low
P209c Gmc DescriptionThe Reductant Injection Air Pressure Sensor sends voltage reading information to the Powertrain Control Module (PCM). The PCM interprets these readings as pressure or exhaust gas temperature. The code is set when the voltage sent from the sensor to the PCM is out of factory specifications.
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