Possible causes

– Faulty Manifold Absolute Pressure (MAP) sensor
– Manifold Absolute Pressure (MAP) sensor harness open or shorted
– Manifold Absolute Pressure (MAP) sensor circuit poor electrical connection

Symptoms

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

P0129 JEEP Description

The Engine Control Module (ECM) has detected an out of range signal from the Manifold Absolute Pressure (MAP) sensor