The MAP Sensor in the GMC Sierra supplies the ECU with manifold pressure information to ensure fuel and air are balanced for power. For many decades now, GMC trucks using the speed density strategy have relied on the MAP Sensor to sense absolute pressure rather than vacuum. As a result, the computer can use this information to calculate air density and set the injector pulse without using a mass airflow meter. By quickly converting pressure data using the intake air temperature signal, the device ensures the correct ignition timing, provides smooth idling, and reduces harmful emissions. It also supports OBD II tests of the exhaust gas recirculation function. For naturally aspirated Sierra models, the MAP Sensor works in conjunction with an intake air temperature signal to convert pressure into air mass, whereas boosted Sierra versions use it with an MAF to optimize fuel delivery under higher loads. The modern GMC supercharged trims still have an MAP Sensor alongside an MAF for accuracy of forced induction, yet the function is the same, measuring absolute manifold conditions that never dip below zero. The fifth generation MAP Sensor, which has a small solid state design, reacts in milliseconds. This keeps every Sierra engine responsive and economical.
Each OEM GMC Sierra MAP Sensor we offer is competitively priced and comes with the assurance of the manufacturer's warranty for the part. Furthermore, we guarantee the speedy delivery of your orders right to your doorstep. Our hassle-free return policy is also in place for your peace of mind.