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Complete Chevy Engine Codes List: Diagnosing Problems in Popular Chevy Models


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.




1. 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

P0001

Fuel Volume Regulator Control Circuit/Open

P0002

Fuel Volume Regulator Control Circuit Range/Performance

P0003

Fuel Volume Regulator Control Circuit Low

P0004

Fuel Volume Regulator Control Circuit High

P0010

“A” Camshaft Position Actuator Circuit (Bank 1)

P0011

“A” Camshaft Timing Over-Advanced or System Performance (Bank 1)

P0012

“A” Camshaft Timing Over-Retarded (Bank 1)

P0013

“B” Camshaft Position Actuator Circuit (Bank 1)

P0014

“B” Camshaft Timing Over-Advanced or System Performance (Bank 1)

P0015

“B” Camshaft Timing Over-Retarded (Bank 1)

P0100 to P0199: Fuel and Air Metering (Continued)

P0100

Mass or Volume Air Flow Circuit Malfunction

P0101

Mass or Volume Air Flow Circuit Range/Performance Problem

P0102

Mass or Volume Air Flow Circuit Low Input

P0103

Mass or Volume Air Flow Circuit High Input

P0106

Manifold Absolute Pressure/BARO Sensor Range/Performance

P0110

Intake Air Temperature Sensor Circuit Malfunction

P0113

Intake Air Temperature Sensor Circuit High Input

P0117

Engine Coolant Temperature Sensor Circuit Low Input

P0120

Throttle/Pedal Position Sensor/Switch “A” Circuit Malfunction

P0121

Throttle/Pedal Position Sensor “A” Circuit Range/Performance Problem




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)

P0200

Injector Circuit/Open

P0201

Injector Circuit/Open – Cylinder 1

P0202

Injector Circuit/Open – Cylinder 2

P0203

Injector Circuit/Open – Cylinder 3

P0204

Injector Circuit/Open – Cylinder 4

P0230

Fuel Pump Primary Circuit

P0231

Fuel Pump Secondary Circuit

P0240

Turbocharger Boost Sensor Circuit Low

P0299

Turbocharger/Supercharger Underboost Condition

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

P0300

Random/Multiple Cylinder Misfire Detected

P0301

Cylinder 1 Misfire Detected

P0302

Cylinder 2 Misfire Detected

P0303

Cylinder 3 Misfire Detected

P0304

Cylinder 4 Misfire Detected

P0305

Cylinder 5 Misfire Detected

P0306

Cylinder 6 Misfire Detected

P0315

Crankshaft Position System Variation Not Learned

P0320

Ignition/Distributor Engine Speed Input Circuit

P0335

Crankshaft Position Sensor “A” Circuit Malfunction

P0340

Camshaft Position Sensor Circuit Malfunction

P0350

Ignition Coil Primary/Secondary Circuit Malfunction

P0400 to P0499: Exhaust Gas Recirculation (EGR) and Emissions Control

P0400

Exhaust Gas Recirculation Flow Malfunction

P0401

Exhaust Gas Recirculation Flow Insufficient Detected

P0410

Secondary Air Injection System Malfunction

P0420

Catalyst System Efficiency Below Threshold (Bank 1)

P0430

Catalyst System Efficiency Below Threshold (Bank 2)

P0440

Evaporative Emission Control System Malfunction

P0441

Evaporative Emission Control System Incorrect Purge Flow

P0446

Evaporative Emission Control System Vent Control Circuit Malfunction

P0455

Evaporative Emission Control System Leak Detected (large leak)


P0500 to P0599: Speed Controls and Idle Control System

P0500

Vehicle Speed Sensor Malfunction

P0505

Idle Control System Malfunction

P0510

Closed Throttle Position Switch Malfunction

P0562

System Voltage Low

P0571

Cruise Control/Brake Switch “A” Circuit Malfunction


P0600 to P0699: Computer Output Circuit

P0600

Serial Communication Link Malfunction

P0601

Internal Control Module Memory Check Sum Error

P0602

Control Module Programming Error

P0603

Internal Control Module Keep Alive Memory (KAM) Error

P0606

PCM Processor Fault

P0610

Control Module Vehicle Options Error


P0700 to P0999: Transmission Codes

P0700

Transmission Control System Malfunction

P0705

Transmission Range Sensor Circuit malfunction

P0730

Incorrect Gear Ratio

P0750

Shift Solenoid “A” Malfunction

P0755

Shift Solenoid “B” Malfunction

P0796

Pressure Control Solenoid “C” Performance/Stuck Off

P0894

Transmission Component Slipping

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

Code

Description

P0130

O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)

P0131

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

P0135

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

P0140

O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)

P0141

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

P0155

O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

P0171

System Too Lean (Bank 1)

P0172

System Too Rich (Bank 1)

P0174

System Too Lean (Bank 2)

5. Fuel System and Air-Fuel Mixture Codes

P0190

Fuel Rail Pressure Sensor Circuit Malfunction

P0191

Fuel Rail Pressure Sensor Circuit Range/Performance

P0193

Fuel Rail Pressure Sensor Circuit High Input

P0194

Fuel Rail Pressure Sensor Circuit Intermittent

P0175

System Too Rich (Bank 2)

P0176

Fuel Composition Sensor Circuit

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.

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