2001 Silverado 1500HD P0161 and P0300 OBD2 Codes: Causes and Solutions
I own a 2001 Chevrolet Silverado 1500HD with a 6.0L engine. While driving home from work today, the check engine light activated. The vehicle is displaying two diagnostic trouble codes: P0161 and P030
Begin by investigating the misfire issue—this is often linked to code P0300. Refer to OBD2 code explanations for P0300: https://www.obd-codes.com/p0300. Check the wiring, connectors, and the oxygen sensor located after the catalytic converter on the passenger side. Additionally, verify your scanner's reading of engine temperature. The temperature gauge only reached 185°F (near the quarter mark) while driving in a 68°F outdoor environment—this could indicate a failing engine coolant temperature sensor.