Manifold Absolute Pressure Sensor

The GM Genuine Parts 12643955 is a direct replacement Manifold Absolute Pressure (MAP) sensor, ensuring it meets the same fit, form, and function as the original factory component. As a GM Original Equipment part, it has undergone rigorous testing and is manufactured to OE specifications, offering the quality, reliability, and durability expected from General Motors. The MAP sensor plays a crucial role in the engine's fuel and management system by measuring intake manifold pressure. This data is vital for the engine control module (ECM) to accurately calculate the amount of air entering the engine. By correlating this with other sensor inputs, the ECM can precisely determine the correct amount of fuel to inject, leading to optimal combustion and engine performance. Installation guidance indicates that for engines manufactured in 2014 and before, MAP sensors on 4.3 L V6, 5.0L, 5.7L, and 7.4L V8 models are typically on the right side of the intake manifold, while 4.8L, 5.3L, and 6.0L V8s are at the back. The replacement process involves disconnecting the battery, removing the engine cover, and carefully unclipping the electrical connector before removing the sensor. It is also recommended to inspect and replace the sealing grommet if it shows signs of damage, using engine oil on the grommet during installation to prevent tearing. This sensor requires programming to function correctly within the vehicle's systems. It features a plastic body, a female oval connector with 1 nipple fitting and 1 port, and male blade terminals (3 total).