Automotive Codes Error Codes
Decode OBD-II diagnostic trouble codes and dashboard warning lights for all vehicle makes and models.
Modern vehicles use On-Board Diagnostics (OBD-II) systems to monitor engine performance, emissions, transmission, and other critical systems. When a problem is detected, the system stores a Diagnostic Trouble Code (DTC) and may illuminate the check engine light or other dashboard warning indicators. This section provides clear explanations for automotive error codes including P-codes (powertrain), C-codes (chassis), B-codes (body), and U-codes (network). Each guide covers what the code means, common causes, diagnostic steps, and whether the issue requires immediate professional attention.
Common Brands
Common Error Code Formats
P0171P0300P0420C0035B1234U0100Error Code Guides (19)
Nissan Pathfinder Chassis Control Error – Meaning, Causes & Fix
Nissan · Pathfinder · Chassis Control Error
P0017 Code Meaning – Chevy Equinox – Causes & Fix
Chevrolet · Vehicle (Equinox) · P0017
P0430 Code Meaning – Ford Explorer – Causes & Fix
Ford · Vehicle (Explorer) · P0430
Honda CR-V Brake System Problem Message – Meaning, Causes & Fix
Honda · Vehicle (CR-V) · Brake System Problem
Toyota Corolla Maintenance Required Light – Meaning, Causes & Fix
Toyota · Vehicle (Corolla) · Maintenance Required Light
Nissan Sentra Chassis Control System Error – Meaning, Causes & Fix
Nissan · Vehicle (Sentra) · Chassis Control System Error
Subaru Forester AT Oil Temp Light Flashing – Meaning, Causes & Fix
Subaru · SUV · AT Oil Temp Light Flashing
Chevy Cruze Engine Power Reduced Message – Meaning, Causes & Fix
Chevrolet · Sedan · Engine Power Reduced
Nissan Rogue AWD Error Message – Meaning, Causes & Fix
Nissan · SUV · AWD Error Message
P0301 Code Meaning (Toyota Corolla) – Causes & Fix
Toyota · Sedan · P0301
Ford F-150 AdvanceTrac Service Light – Meaning, Causes & Fix
Ford · Pickup Truck · AdvanceTrac Service Light
Honda Accord Emissions System Problem – Meaning, Causes & Fix
Honda · Sedan · Emissions System Problem
P0442 Code Meaning (Chevy Malibu) – Causes & Fix
Chevrolet · Sedan · P0442
P0455 Code Meaning (Jeep Grand Cherokee) – Causes & Fix
Jeep · SUV · P0455
P0171 Code on Toyota – Meaning, Causes & Fixes
Toyota · Vehicle · P0171
Nissan Altima P0300 Code – Meaning, Causes & Fixes
Nissan · Vehicle · P0300
P0420 Code on Ford Focus – Meaning, Causes & Fixes
Ford · Vehicle · P0420
Honda Civic Check Engine Light Flashing – Meaning, Causes & What to Do
Honda · Vehicle · Check Engine Light Flashing
Chevy Silverado Service StabiliTrak Message – Meaning, Causes & Fixes
Chevrolet · Vehicle · Service StabiliTrak
Frequently Asked Questions
What does the check engine light mean?
The check engine light indicates that your vehicle's OBD-II system has detected an issue and stored a diagnostic trouble code. It can range from a loose gas cap to a serious engine problem. Use an OBD-II scanner to read the specific code.
Can I drive with a check engine light on?
A steady check engine light usually means the issue is not immediately dangerous, but should be diagnosed soon. A flashing check engine light indicates a severe problem — reduce speed and seek service immediately.
Are OBD-II codes the same for all vehicles?
Generic P0xxx codes are standardized across all manufacturers. However, manufacturer-specific codes (P1xxx and above) vary by brand. Always consider the make, model, and year when interpreting codes.