P0122 Chrysler 300C - Throttle Position Sensor Circuit Low | Step-by-Step Diagnosis

P0122 (Throttle Position Sensor 1 Circuit Low) on a Chrysler 300 / 300C (2005-2010, LX platform)? This video walks through the complete factory step-by-step diagnostic procedure with the wiring diagram and connector views. What the code means: TP sensor No.1 voltage at the PCM drops below 0.16 volt for 0.7 second. One-trip fault - the ETC light comes on immediately. In this video: 1. Verify the DTC is active 2. Is P0222 set too? (points straight to the 5-volt supply) 3. (F855) 5-volt supply circuit checks - voltage, open, short to ground 4. Throttle position sensor test 5. (K22) signal circuit shorted to ground / to sensor return 6. When the PCM is to blame - and the throttle follower test Applies to Chrysler 300, 300C and 300 SRT-8 (2.7L, 3.5L, 5.7L HEMI, 6.1L) model years 2005-2010. Similar logic applies to Dodge Charger, Magnum and Challenger (same LX platform). This is general information for educational purposes - always confirm against the service information for your exact vehicle.