GMC ENVOY SENSORS. What are you working on today? Shop for your specific vehicle to find parts that fit. Year. Make. Model. Engine. Year. Make. Model. Engine. GMC Envoy MAP Sensor Connector. GMC Envoy Mass Air Flow Sensor. GMC Envoy Oxygen Sensor. GMC Envoy Sensor Fuel Level. GMC Envoy Suspension Position Sensor..GMC Envoy Replacement MAP Sensor Information Search our online map sensor catalog and find the lowest priced discount auto parts on the web. We sell wholesale to the public. We offer high quality new, OEM, aftermarket and remanufactured GMC Envoy MAP Sensor parts..Disconnect the exhaust before the catalytic convertor and test drive and above GMC catalytic tend to plug easy, If the catalytic is to difficult to disconnect, plus you need to secure from falling remove the sensor on each bank before the catalytic,this may be a easy approach.Just to let you what effects the performace of the MAP sensor is a plug exhaust,it creates back .It indicates your GMC Envoy’s MAP manifold absolute pressure sensor’s voltage reading is outside of the normal operating range. The voltage is too high. It’s most commonly caused by a bad MAP sensor, wiring issue, or vacuum leak. The MAP sensor measures the air pressure coming into your Envoy’s engine and sends that signal to the ECM..