When is the code detected?

The P0299 code is set when the measured MAP pressure is more than 39 kPa below the expected range for 10 seconds.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0299 CHEVROLET Description

The Manifold Absolute Pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by turbocharge output, engine speed, accelerator pedal input, ambient air temperature, and Barometric Pressure (BARO). A diagram within the MAP pressure sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. Under normal operation, then lowest pressure that can exist in the intake manifold is equal to the BARO. This occurs when the vehicle is operated at idle or when the ignition is ON while the engine is OFF. The highest manifold pressure occur when the turbocharge output is high. The manifold pressure range from 58 kPa (8 psi) when pressure are low to more than 296 kPa(42.7 psi) when pressures are high, depending on the BARO,

CHEVROLET Technical Service Bulletins for P0299 code