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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 502 (2.4L - DTCS P2123 To U1418) >> Diagnosis And Testing >> P2440-Air Pump Switch Valve Stuck Open >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2013 Dodge Avenger and 2013 Chrysler 200. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
(K157) MAF SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K157) MAF SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
(K157) MAF SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE
(K957) MAF SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE
SECONDARY AIR CHECK VALVE
SECONDARY AIR PUMP ASSEMBLY
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  STANDARD PROCEDURE  .