Check engine light on? Find your code. Fix it right.

Search 13,700+ OBD-II, diesel, and EV fault codes — what each one means, what causes it, and what the repair really costs. Free, no account.

Popular: P0300P0420P0171P0442P0128P0455P0700P0301P0340P0131
13,715 codes 2,409 en español Free forever Updated 2026 No account needed

Popular Searches

Common code + vehicle combinations people look up.

P0300 Chevrolet P0420 Toyota P0171 Ford P0128 Jeep P0442 Honda P0700 Dodge P0340 Nissan 6.7 Cummins codes Duramax P0087 LB7 injector codes 6.0 Power Stroke codes 7.3 Power Stroke codes DEF system fault DPF regen fault PACCAR MX-13 codes

Browse by System

Engine (2537) Transmission (896) Body (2418) Chassis (2384) Network (2526) Emissions (284) EVAP (29) Diesel

Don't Know Your Code? Start With Symptoms

Select a symptom to find likely codes, causes, and fixes.

Check engine light flashing Car shaking at idle Car won't start Engine overheating Car won't accelerate Rough idle Poor gas mileage White smoke from exhaust Engine knocking noise Car jerking when accelerating Battery light on Car stalling Gas smell from car Car losing power

Car Code Finder is a free diagnostic code reference with 13,500 codes: gas/automotive OBD-II codes, plus diesel truck, EV (Tesla, Chevrolet Bolt), heavy-duty, agricultural, marine, and equipment codes. Each code includes causes ranked by likelihood, step-by-step diagnostics, repair cost estimates, and vehicle-specific fixes.

Available in Spanish (2,409 códigos diésel): diesel trucks, agricultural and construction equipment, marine diesel,engine brand hubs (Cummins, Duramax, Power Stroke, PACCAR, Detroit Diesel, John Deere, Kubota), and aftertreatment / Allison / heavy-duty sections.