Delphi PS20121 Manifold Absolute Pressure Sensor

Delphi PS20121 Manifold Absolute Pressure Sensor

The Delphi PS20121 is a standard replacement manifold absolute pressure sensor built for accurate pressure readings and reliable engine management data. It is a direct-fit sensor for select Buick, Chevrolet, and GMC applications, including popular Silverado 2500 HD, Silverado 3500 HD, Equinox, Malibu, Terrain, and Encore models.

Key Features

• Manifold Absolute Pressure Sensor for engine load and air pressure monitoring
• Standard replacement grade for OE-style service work
• Black plastic housing with a black oval connector
• 1 connector, 4 male terminals, pin terminal type
• Maximum pressure reading: 56
• Tested and calibrated to OE standards for accurate readings
• Package contents: manifold absolute pressure sensor

Product Details

Delphi PS20121 is engineered for vehicles that rely on precise manifold pressure input for fuel delivery, ignition timing, and drivability control. Delphi validates its sensors using OE development and product testing methods, helping ensure consistent signal output and dependable performance. This part cross-references Standard Ignition AX461 for the same application. Common search terms for this sensor include Delphi PS20121 MAP sensor, Buick Encore MAP sensor, and Chevrolet Silverado 2500 HD manifold absolute pressure sensor.

Vehicle Fitment

• Fits 2021-2022 Buick Encore, N/A
• Fits 2018-2019 Buick Encore, N/A
• Fits 2016-2019 Buick Cascada, N/A
• Fits 2018-2022 Chevrolet Equinox, N/A
• Fits 2018-2022 Chevrolet Malibu, N/A
• Fits 2017-2022 Chevrolet Silverado 2500 HD, N/A
• Fits 2017-2022 Chevrolet Silverado 3500 HD, N/A
• Fits 2021-2022 Chevrolet Trax, N/A
• Fits 2018-2019 Chevrolet Cruze, N/A
• Fits 2017-2022 GMC Sierra 2500 HD, N/A
• Fits 2017-2022 GMC Sierra 3500 HD, N/A
• Fits 2018-2022 GMC Terrain, N/A

Common Issues This Sensor Can Address

• Erratic engine idle caused by inaccurate manifold pressure readings
• Check engine light related to MAP sensor performance
• Hesitation or poor throttle response under load
• Rough acceleration from incorrect air/fuel calculations
• Driveability concerns tied to faulty pressure signal input

Installation Notes

Verify connector shape, terminal count, and housing style before installation. Confirm the sensor location on the intake manifold or intake tract matches the original part, and inspect the connector for corrosion or damaged pins before plugging in the new Delphi PS20121. After installation, clear diagnostic trouble codes and confirm normal sensor readings with a scan tool.

Quality Assurance

Delphi backs its sensor portfolio with OE development and validation methods, and each sensor is tested and calibrated to OE standards to support accurate readings and reduce comebacks.