OBD2 Diagnostic Trouble Codes
Browse our complete database of OBD2 fault codes. Each code page includes plain-English explanations, ranked causes, estimated repair costs, and vehicle-specific diagnostic guides powered by Skanyx AI data.
Electrical
"A" Camshaft Position Actuator Circuit (Bank 1)
Engine Overspeed Condition
Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
Glow Plug / Heater Circuit "A" Malfunction
Vehicle Speed Sensor "A" Malfunction
Vehicle Speed Sensor "A" Range/Performance
Vehicle Speed Sensor "A" Circuit Low Input
Vehicle Speed Sensor "A" Intermittent/Erratic/High
Brake Switch "A"/"B" Correlation
Idle Air Control System Circuit Low
Idle Air Control System Circuit High
System Voltage Low
Serial Communication Link Malfunction
ECM/PCM Processor Fault
Glow Plug Control Module Circuit
Cylinder 1 Glow Plug Circuit
Cylinder 2 Glow Plug Circuit
Cylinder 3 Glow Plug Circuit
Cylinder 4 Glow Plug Circuit
Intake Manifold Runner Control Circuit/Open (Bank 1)
Emissions
"A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
"B" Camshaft Position - Timing Over-Retarded (Bank 1)
"A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)
"A" Camshaft Position - Timing Retarded (Bank 2)
Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance
Intake Air Temperature Sensor 1 Circuit High
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
O2 Sensor Circuit Malfunction (Bank 1, Sensor 2)
O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
O2 Sensor Circuit High Voltage (Bank 1, Sensor 2)
O2 Sensor Circuit Slow Response (Bank 1, Sensor 2)
O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 2)
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
O2 Sensor Circuit Low Voltage (Bank 1, Sensor 3)
O2 Sensor Circuit High Voltage (Bank 1, Sensor 3)
O2 Sensor Circuit Slow Response (Bank 1, Sensor 3)
O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 3)
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 3)
Exhaust Gas Recirculation Flow Malfunction
Exhaust Gas Recirculation (EGR) Flow Insufficient
Exhaust Gas Recirculation Flow Excessive Detected
Exhaust Gas Recirculation Control Circuit Malfunction
Exhaust Gas Recirculation Control Circuit Range/Performance
Exhaust Gas Recirculation Sensor "A" Circuit Low
Exhaust Gas Recirculation Sensor "A" Circuit High
Exhaust Gas Recirculation Sensor "B" Circuit Low
Exhaust Gas Recirculation Sensor "B" Circuit High
Secondary Air Injection System Malfunction
Secondary Air Injection System Incorrect Flow Detected
Catalyst System Efficiency Below Threshold (Bank 1)
Warm Up Catalyst Efficiency Below Threshold (Bank 1)
Main Catalyst Efficiency Below Threshold (Bank 1)
Heated Catalyst Efficiency Below Threshold (Bank 1)
Heated Catalyst Temperature Below Threshold (Bank 1)
Catalyst System Efficiency Below Threshold (Bank 2)
Warm Up Catalyst Efficiency Below Threshold (Bank 2)
Main Catalyst Efficiency Below Threshold (Bank 2)
Heated Catalyst Efficiency Below Threshold (Bank 2)
Heated Catalyst Temperature Below Threshold (Bank 2)
Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
Diesel Particulate Filter Differential Pressure Too Low (Bank 1)
Diesel Particulate Filter Differential Pressure Too High (Bank 1)
DEF (AdBlue) System: Time Limit For Restricted Operation Mode Exceeded
Ignition
Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B)
Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor A)
Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor B)
Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
Crankshaft Position Sensor "A" Circuit Malfunction
Camshaft Position Sensor Circuit Malfunction
Camshaft Position Sensor "A" Circuit Range/Performance
Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor)
Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor)
Fuel System
Fuel Rail/System Pressure - Too Low
Mass Air Flow Sensor Range/Performance
Mass or Volume Air Flow Circuit Low Input
Mass or Volume Air Flow Circuit High Input
Fuel Trim Malfunction (Bank 1)
System Too Lean (Bank 1)
System Too Rich (Bank 1)
Fuel Trim Malfunction (Bank 2)
System Too Lean (Bank 2)
System Too Rich (Bank 2)
Fuel Rail Pressure Sensor Circuit Range/Performance
Injector Circuit / Open - Cylinder 1
Injector Circuit / Open - Cylinder 2
Injector Circuit / Open - Cylinder 3
Injector Circuit / Open - Cylinder 4
Injector Circuit / Open - Cylinder 5
Injector Circuit / Open - Cylinder 6
Turbocharger/Supercharger "A" Overboost Condition
Turbocharger/Supercharger "A" Underboost Condition
Idle Air Control System RPM Lower Than Expected
Idle Control System RPM Higher Than Expected
Intake Manifold Runner Control Stuck Open (Bank 1)
Intake Manifold Runner Control Stuck Closed (Bank 1)
Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance (Bank 1)
System Too Lean at Idle (Bank 1)
System Too Rich at Idle (Bank 1)
Cooling System
Engine Coolant Temperature (ECT) Circuit
Engine Coolant Temperature (ECT) Circuit Range / Performance
Engine Coolant Temperature (ECT) Circuit Low
Engine Coolant Temperature (ECT) Circuit High
Coolant Thermostat Below Regulating Temperature
Misfire
Random/Multiple Cylinder Misfire Detected
Cylinder 1 Misfire Detected
Cylinder 2 Misfire Detected
Cylinder 3 Misfire Detected
Cylinder 4 Misfire Detected
Cylinder 6 Misfire Detected
EVAP System
Evaporative Emission Control System Malfunction
Evaporative Emission System Leak Detected (Small Leak)
Evaporative Emission System Vent Control Circuit
Evaporative Emission Control System Vent Control Circuit Open
Evaporative Emission Control System Vent Control Circuit Shorted
Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
Evaporative Emission Control System Pressure Sensor Intermittent
Evaporative Emission System Leak Detected (Large Leak)
Evaporative Emission System: Very Small Leak
Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
Transmission
Transmission Control System Malfunction
Input/Turbine Speed Sensor Circuit Malfunction
Output Speed Sensor Circuit Malfunction
Torque Converter Clutch Circuit Performance/Stuck Off
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