Possible causes
– Manifold Differential Pressure sensor harness is open or shorted
– Manifold Differential Pressure sensor circuit poor electrical connection
– Faulty Manifold Differential Pressure sensor
– Manifold Differential Pressure sensor circuit poor electrical connection
– Faulty Manifold Differential Pressure sensor
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1400 JEEP Description
The Engine Control Module (ECM) detected an open or shorted condition in the MDP sensor