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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (6.7L Diesel - DTCS - P21C4 To U1601 - 3500 Cab & Chassis) >> Diagnosis and Testing >> P2609-Intake Air Heater System Performance >> Code Description >> Set Condition:

Set Condition:

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The Powertrain Control Module (PCM) monitors the battery system voltage and looks for a calibrated drop when the Intake Air Heater is commanded on. The fault is set if the PCM detects a voltage difference below the calibrated value when the Intake Air Heater circuit is commanded on and off during the preheat cycle at key on.

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