Chrysler 300 OBD-II Diagnostic Guide
Comprehensive diagnostic trouble code telemetry, sensor voltage thresholds, and step-by-step repair manuals for Chrysler 300 models equipped with 3.6L Pentastar V6 (292HP) / 5.7L / 6.4L 392 HEMI V8 (485HP SRT8).
Chrysler 300 Problem & Reliability Intelligence by Year
Top Check Engine Trouble Codes for Chrysler 300
P0300 on Chrysler 300: Diagnosis & Fix
Troubleshooting procedure for P0300: P0300: Random or Multiple Cylinder Misfire Detected specifically affecting Chrysler 300 (3.6L Pentastar V6 (292HP) / 5.7L / 6.4L 392 HEMI V8 (485HP SRT8)).
P0420 on Chrysler 300: Diagnosis & Fix
Troubleshooting procedure for P0420: P0420: Catalyst System Efficiency Below Threshold (Bank 1) specifically affecting Chrysler 300 (3.6L Pentastar V6 (292HP) / 5.7L / 6.4L 392 HEMI V8 (485HP SRT8)).
P0171 on Chrysler 300: Diagnosis & Fix
Troubleshooting procedure for P0171: P0171: System Too Lean (Bank 1) specifically affecting Chrysler 300 (3.6L Pentastar V6 (292HP) / 5.7L / 6.4L 392 HEMI V8 (485HP SRT8)).
P0520 on Chrysler 300: Diagnosis & Fix
Troubleshooting procedure for P0520: P0520: Engine Oil Pressure Sensor/Switch Circuit Malfunction specifically affecting Chrysler 300 (3.6L Pentastar V6 (292HP) / 5.7L / 6.4L 392 HEMI V8 (485HP SRT8)).
P0128 on Chrysler 300: Diagnosis & Fix
Troubleshooting procedure for P0128: P0128: Coolant Temperature Below Thermostat Regulating Temperature specifically affecting Chrysler 300 (3.6L Pentastar V6 (292HP) / 5.7L / 6.4L 392 HEMI V8 (485HP SRT8)).
Looking for another fault code on your Chrysler 300?
Search our comprehensive 200+ SAE J1979 master OBD-II directory for Powertrain (P), Body (B), Chassis (C), and Network (U) diagnostic codes.
Frequently Asked Questions
Where is the OBD-II diagnostic port located on the Chrysler 300?
On the Chrysler 300 (2020–2025), the standard 16-pin DLC port is located: Under driver side dash near left knee panel. It supports SAE J1979 / ISO 15765-4 CAN protocols for all handheld OBD-II code readers.
What are the most common Check Engine fault codes on the Chrysler 300?
The most frequently logged trouble codes on the Chrysler 300 (3.6L Pentastar V6 (292HP) / 5.7L / 6.4L 392 HEMI V8 (485HP SRT8)) include P0300, P0420, P0171, P0520.
How does an onboard diagnostic scan communicate with the Chrysler 300?
Connecting an OBD-II scanner to the Chrysler 300's 16-pin DLC port establishes a high-speed CAN link (ISO 15765-4) with the ECM/PCM. It interrogates SAE J1979 Modes $01 through $0A for active DTCs, freeze-frame sensor telemetry, and oxygen sensor readiness monitors.