OBD-II DTC Code Lookup
Search thousands of diagnostic trouble codes. Get causes, symptoms, and fixes explained in plain language.
P
Powertrain
Engine, transmission, and drivetrain codes
B
Body
Interior, exterior, and body system codes
C
Chassis
ABS, steering, suspension, and brake codes
U
Network
CAN bus, module communication codes
Most Common Codes
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
P0171
System Too Lean (Bank 1)
P0172
System Too Rich (Bank 1)
P0420
Catalyst System Efficiency Below Threshold (Bank 1)
P0430
Catalyst System Efficiency Below Threshold (Bank 2)
P0440
EVAP System Malfunction
P0442
EVAP System Small Leak Detected
P0455
EVAP System Large Leak Detected
P0135
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0401
EGR Flow Insufficient
P0505
Idle Air Control System Malfunction
P0325
Knock Sensor 1 Circuit Malfunction
P0335
Crankshaft Position Sensor Circuit Malfunction
P0340
Camshaft Position Sensor Circuit Malfunction
P0700
Transmission Control System Malfunction
P0128
Fuel & Air Metering — Code P0128