Codes

9 resources

• Fuel-tank pressure sensor: interpret the evidence

  Understand FTP feedback, a fixed reading and the Sierra case. Separate scan-tool data, circuit evidence and a functional recheck.

• GM 1.4L P0171: PCV Checks and Repair Guide

  Follow GoTech's GM 1.4L P0171 guide through symptoms, PCV checks, repair steps and confirmation, with source-video moments throughout.

• How to Fix P0521, P0522, P0523 Codes on GM V8

  Learn what can cause a P0521, P0522 or P0523 trouble code to set on a GM V8 engine and how to fix it

• Fix Chevy Cruze/Aveo/Sonic P0597 & P0598 — Thermostat Heater Circuit (1.8L)

  Diagnose and repair Chevy Cruze/Aveo/Sonic 1.8L codes P0597/P0598. Includes thermostat resistance spec (~13–15Ω), control circuit test-light method, replacement steps, tools, torque, and video.

• How to Diagnose a P0420 Code

  Learn how to diagnose P0420/P0430 codes with leak checks, O₂ sensor graphs, and confirmation steps before replacing the catalytic converter.

• P0171 and P0174 Lean Trouble Codes

  Learn what P0171 and P0174 trouble codes mean, their symptoms, how to diagnose, and how to correct these codes

• P0172 and P0175 Rich Trouble Codes

  Learn what P0172 and P0175 trouble codes mean, their symptoms, how to diagnose, and how to correct these codes

• P0300 Misfire Trouble Code

  Learn what a P0300 trouble code means, its symptoms, how to diagnose, and how to clear the diagnostic trouble code

• P0420 Catalytic Converter Trouble Code

  DTC P0420 sets when the catalytic convertor fails to efficiently remove harmful pollutants from the engines exhaust gas.