Complete Chevy Engine Codes List: Diagnosing Problems in Popular Chevy Models
- blueprismautomotiv
- Oct 9, 2024
- 5 min read
Updated: Feb 25
When your Chevy vehicle experiences an engine issue, your onboard diagnostics system generates diagnostic trouble codes (DTCs) that point to specific problems. Understanding these codes is key to maintaining engine health and keeping your vehicle running smoothly. Whether you drive a Chevy Silverado, Camaro, or Malibu, this guide will help you interpret these codes and take appropriate action.
What Are Engine Codes in Chevy Vehicles?
Engine codes (DTCs) are part of your Chevy vehicle’s OBD-II system, which detects problems related to engine performance, fuel efficiency, emissions, and more. These codes begin with "P" for powertrain-related issues, followed by four digits that pinpoint the problem.
2. How to Read Chevy Engine Codes
To read engine codes, you need an OBD-II scanner, which plugs into the vehicle’s diagnostic port. Once connected, the scanner will display the engine code(s) stored by the car's onboard computer, helping you or a technician diagnose and fix the problem.
3. List of Chevy Engine Codes and Their Meanings
P0000 to P0099: Fuel and Air Metering
P0100 to P0199: Fuel and Air Metering (Continued)
If you're dealing with a P0300 code, which indicates random or multiple cylinder misfires, it’s important to know that this could stem from various issues. The most common causes are faulty spark plugs, ignition coils, or fuel injectors, so you should start by inspecting these components. When encountering a P0420 code, which suggests that the catalyst system efficiency is below the required threshold (Bank 1), you can still drive your vehicle, but this problem usually points to a failing catalytic converter, which may affect your car's emissions
P0200 to P0299: Fuel and Air Metering (Injector Circuit)
The P0200 to P0299 codes relate to fuel injector circuit issues. For P0200 (Injector Circuit/Open), check the wiring and connectors for any damage or corrosion. If no issues are found, test the injector's resistance with a multimeter to ensure it's functioning properly—clean or replace the injector if needed.
For cylinder-specific codes like P0201 (Injector Circuit/Open – Cylinder 1), focus on inspecting and testing that specific injector and its wiring. Issues with P0230 (Fuel Pump Primary Circuit) or P0231 (Fuel Pump Secondary Circuit) indicate possible fuel pump electrical problems. Inspect the fuel pump relay, fuses, and wiring for faults.
For P0299 (Turbocharger Underboost), check for leaks, damaged hoses, or malfunctioning turbo components. Proper inspection of these systems can prevent further engine performance issues.
P0300 to P0399: Ignition System or Misfire
P0400 to P0499: Exhaust Gas Recirculation (EGR) and Emissions Control
P0500 to P0599: Speed Controls and Idle Control System
P0600 to P0699: Computer Output Circuit
P0700 to P0999: Transmission Codes
Transmission codes in the P0700 to P0999 range often signal issues with shifting, solenoids, or the transmission control system. Start by checking the transmission fluid level and condition, as low or dirty fluid can lead to performance problems. P0700 indicates a general malfunction in the transmission control system, so scanning for additional codes can provide more details. For issues like P0730 (Incorrect Gear Ratio) or P0894 (Transmission Slipping), inspect for worn internal components, slipping gears, or pressure issues. Codes like P0750 and P0755 point to faulty shift solenoids, so check the solenoids and their wiring. Always inspect connections, sensors, and relays, as electrical issues are common culprits in transmission malfunctions. Regular maintenance and prompt attention to codes can prevent further damage.
4. Emissions and Oxygen Sensor-Related Codes
5. Fuel System and Air-Fuel Mixture Codes
it’s crucial to resolve the root problem before clearing the code, as simply erasing it won’t fix the issue and the code is likely to reappear. Addressing these codes promptly helps in preventing further damage to your Chevy’s engine and emissions system, ensuring optimal vehicle performance and compliance with emissions standards
6. Most Common Chevy Engine Codes by Model
Chevy Silverado
P0300: Random/Multiple Cylinder Misfire
P0420: Catalyst System Efficiency Below Threshold (Bank 1)
P0171: System Too Lean (Bank 1)
P0301: Cylinder 1 Misfire Detected
Chevy Malibu
P0011: Camshaft Position Timing Over-Advanced (Bank 1)
P0442: Evaporative Emission Control System Leak Detected (small leak)
Chevy Traverse
P0430: Catalyst System Efficiency Below Threshold (Bank 2)
P0305: Cylinder 5 Misfire Detected
Understanding your Chevy engine codes can save you time and money by helping you diagnose engine problems efficiently. Whether you drive a Chevy Silverado, Camaro, Malibu, or Traverse, being familiar with these codes enables you to maintain your vehicle’s performance and prevent costly repairs.