A diagnostic trouble code (DTC) is a code generated by the onboard diagnostics system (OBD) in a vehicle to indicate a potential issue or malfunction within the vehicle’s systems. These codes are alphanumeric and typically consist of a letter followed by four numbers (e.g., P0300). Each code corresponds to a specific problem detected by the vehicle’s computer. Here below is an example to illustrate the structure of the digits:
DTCs serve as a starting point for technicians to diagnose problems within a vehicle. When a fault is detected, the OBD system illuminates the “Check Engine” or “Service Engine Soon” light on the dashboard and stores a corresponding DTC in the vehicle’s computer memory. These codes can be retrieved using a diagnostic scan tool, which plugs into a port usually located under the dashboard.
Once the DTC is retrieved, technicians use diagnostic procedures, service manuals, and their expertise to identify the root cause of the issue. DTCs can range from simple issues like a loose gas cap to more complex problems involving engine sensors, emissions control systems, or other vehicle components.
It’s essential to address DTCs promptly to prevent potential damage to the vehicle and ensure optimal performance and fuel efficiency. Ignoring DTCs can lead to more significant problems down the line and may result in costly repairs. Therefore, when the “Check Engine” light illuminates, it’s advisable to have the vehicle diagnosed and repaired by a qualified technician to resolve any underlying issues.
Here’s a lists of Automotive Diagnostic Trouble Codes Meaning.
- DTC B0001 Driver Frontal Stage 1 Deployment Control (Subfault)
- DTC B0002 Driver Frontal Stage 2 Deployment Control (Subfault)
- DTC B0003 Driver Frontal Stage 3 Deployment Control (Subfault)
- DTC P0001 Fuel Volume Regulator Control Circuit / Open
- DTC P0002 Fuel Volume Regulator Control Circuit Range/Performance
- DTC P0003 Fuel Volume Regulator Control Circuit Low
- DTC P0004 Fuel Volume Regulator Control Circuit High
- DTC P0005 Fuel Shutoff Valve Control Circuit/Open
- DTC P0006 Fuel Shutoff Valve Control Circuit Low
- DTC P0007 Fuel Shutoff Valve Control Circuit High
- DTC P0008 Engine Position System Performance Bank 1
- DTC P0009 Engine Position System Performance Bank 2
- DTC P000A ‘A’ Camshaft Position Slow Response Bank 1
- DTC P000E Fuel Volume Regulator Control Exceeded Learning Limit
- DTC P000F Fuel System Over Pressure Relief Valve Activated
- DTC P0010 Intake Camshaft Position Actuator Circuit / Open Bank 1
- DTC P0011 Intake Camshaft Position Timing – Over-Advanced Bank 1
- DTC P0012 Intake Camshaft Position Timing – Over-Retarded Bank 1
- DTC P0013 Exhaust Camshaft Position Actuator Circuit / Open Bank 1
- DTC P0014 Exhaust Camshaft Position Timing – Over-Advanced Bank 1
- DTC P0015 Exhaust Camshaft Position Timing – Over-Retarded Bank 1
- DTC P0016 Crankshaft Position – Camshaft Position Correlation Bank 1 Sensor A
- DTC P0017 Crankshaft Position – Camshaft Position Correlation Bank 1 Sensor B
- DTC P0018 Crankshaft Position – Camshaft Position Correlation Bank 2 Sensor A
- DTC P0019 Crankshaft Position – Camshaft Position Correlation Bank 2 Sensor B
- DTC P001A ‘A’ Camshaft Profile Actuator ‘A’ Control Circuit/Open Bank 1
- DTC P001B ‘A’ Camshaft Profile Actuator ‘A’ Control Circuit Low Bank 1
- DTC P001C ‘A’ Camshaft Profile Actuator ‘A’ Control Circuit High Bank 1
- DTC P0020 Intake Camshaft Position Actuator Circuit / Open Bank 2
- DTC P0021 Intake Camshaft Position – Timing Over-Advanced or System Performance Bank 2
- DTC P0022 Intake Camshaft Position – Timing Over-Retarded Bank 2
- DTC P0023 Exhaust Camshaft Position Actuator Circuit / Open Bank 2
- DTC P0024 Exhaust Camshaft Position – Timing Over-Advanced or System Performance Bank 2
- DTC P0025 Exhaust Camshaft Position – Timing Over-Retarded Bank 2
- DTC P0026 Intake Valve Control Solenoid Circuit Range/Performance Bank 1
- DTC P0027 Exhaust Valve Control Solenoid Circuit Range/Performance Bank 1
- DTC P0028 Intake Valve Control Solenoid Circuit Range/Performance Bank 2
- DTC P0029 Exhaust Valve Control Solenoid Circuit Range/Performance Bank 2
- DTC P002D ‘B’ Camshaft Profile Actuator ‘B’ Control Circuit/Open Bank 2
- DTC P002E ‘B’ Camshaft Profile Actuator ‘B’ Control Circuit Low Bank
- DTC P002F ‘B’ Camshaft Profile Actuator ‘B’ Control Circuit High Bank 2
- DTC P0030 Heated Oxygen Sensor (H02S) Heater Control Circuit Bank 1 Sensor 1
- DTC P0031 Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 1
- DTC P0032 Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 1 Sensor 1
- DTC P0033 Turbocharger/Supercharger Bypass Valve Control Circuit / Open
- DTC P0034 Turbocharger/Supercharger Bypass Valve Control Circuit Low
- DTC P0035 Turbocharger/Supercharger Bypass Valve Control Circuit High
- DTC P0036 HO2S Heater Control Circuit Bank 1 Sensor 2
- DTC P0037 HO2S Heater Control Circuit Low Bank 1 Sensor 2
- DTC P0038 HO2S Heater Control Circuit High Bank 1 Sensor 2
- DTC P0039 Turbocharger/Supercharger Bypass Valve Control Circuit Range/Performance
- DTC P0040 O2 Sensor Signals Swapped Bank 1 Sensor 1 / Bank 2 Sensor 1
- DTC P0041 O2 Sensor Signals Swapped Bank 1 Sensor 2 / Bank 2 Sensor 2
- DTC P0042 HO2S Heater Control Circuit Bank 1 Sensor 3
- DTC P0043 HO2S Heater Control Circuit Low Bank 1 Sensor 3
- DTC P0044 HO2S Heater Control Circuit High Bank 1 Sensor 3
- DTC P0045 Turbocharger/Supercharger Boost Control “A” Circuit/Open
- DTC P0046 Turbocharger/Supercharger Boost Control “A” Circuit Range/Performance
- DTC P0047 Turbocharger/Supercharger Boost Control “A” Circuit Low
- DTC P0048 Turbocharger/Supercharger Boost Control “A” Circuit High
- DTC P0049 Turbocharger/Supercharger “A” Turbine Overspeed
- DTC P0050 HO2S Heater Control Circuit Bank 2 Sensor 1
- DTC P0051 HO2S Heater Control Circuit Low Bank 2 Sensor 1
- DTC P0052 HO2S Heater Control Circuit High Bank 2 Sensor 1
- DTC P0053 HO2S Heater Resistance Bank 1 Sensor 1
- DTC P0054 HO2S Heater Resistance Bank 1 Sensor 2
- DTC P0055 HO2S Heater Resistance Bank 1 Sensor 3
- DTC P0056 HO2S Heater Control Circuit Bank 2 Sensor 2
- DTC P0057 HO2S Heater Control Circuit Low Bank 2 Sensor 2
- DTC P0058 HO2S Heater Control Circuit High Bank 2 Sensor 2
- DTC P0059 HO2S Heater Resistance Bank 2 Sensor 1
- DTC P0060 HO2S Heater Resistance Bank 2 Sensor 2
- DTC P0061 HO2S Heater Resistance Bank 2 Sensor 3
- DTC P0062 HO2S Heater Control Circuit Bank 2 Sensor 3
- DTC P0063 HO2S Heater Control Circuit Low Bank 2 Sensor 3
- DTC P0064 HO2S Heater Control Circuit High Bank 2 Sensor 3
- DTC P0065 Air Assisted Injector Control Range/Performance
- DTC P0066 Air Assisted Injector Control Circuit Low
- DTC P0067 Air Assisted Injector Control Circuit High
- DTC P0068 MAP/MAF – Throttle Position Correlation
- DTC P0069 Manifold Absolute Pressure – Barometric Pressure Correlation
- DTC P006A MAP – Mass or Volume Air Flow Correlation Bank 1
- DTC P006B MAP – Exhaust Pressure Correlation
- DTC P0070 Ambient Air Temperature Sensor Circuit “A”
- DTC P0071 Ambient Air Temperature Sensor Circuit “A” Range/Performance
- DTC P0072 Ambient Air Temperature Sensor Circuit “A” Low
- DTC P0073 Ambient Air Temperature Sensor Circuit “A” High
- DTC P0074 Ambient Air Temperature Sensor Circuit “A” Intermittent/Erratic
- DTC P0075 Intake Valve Control Solenoid Circuit Bank 1
- DTC P0076 Intake Valve Control Solenoid Circuit Low Bank 1
- DTC P0077 Intake Valve Control Solenoid Circuit High Bank 1
- DTC P0078 Exhaust Valve Control Solenoid Circuit Bank 1
- DTC P0079 Exhaust Valve Control Solenoid Circuit Low Bank 1
- DTC P0080 Exhaust Valve Control Solenoid Circuit High Bank 1
- DTC P0081 Intake Valve Control Solenoid Circuit Bank 2
- DTC P0082 Intake Valve Control Solenoid Circuit Low Bank 2
- DTC P0083 Intake Valve Control Solenoid Circuit High Bank 2
- DTC P0084 Exhaust Valve Control Solenoid Circuit Bank 2
- DTC P0085 Exhaust Valve Control Solenoid Circuit Low Bank 2
- DTC P0086 Exhaust Valve Control Solenoid Circuit High Bank 2
- DTC P0087 Fuel Rail/System Pressure Too Low
- DTC P0088 Fuel Rail/System Pressure Too High
- DTC P0089 Fuel Pressure Regulator Performance
- DTC P0090 Fuel Pressure Regulator Control Circuit/Open
- DTC P0091 Fuel Pressure Regulator Control Circuit Low
- DTC P0092 Fuel Pressure Regulator Control Circuit High
- DTC P0093 Fuel System Leak Detected – Large Leak
- DTC P0094 Fuel System Leak Detected – Small Leak
- DTC P0095 Intake Air Temperature Sensor 2 Circuit
- DTC P0096 Intake Air Temperature Sensor 2 Circuit Range/Performance
- DTC P0097 Intake Air Temperature Sensor 2 Circuit Low
- DTC P0098 Intake Air Temperature Sensor 2 Circuit High
- DTC P0099 Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic
- DTC P009A Intake Air Temperature/Ambient Air Temperature Correlation
- DTC P009B Fuel Pressure Relief Control Circuit/Open
- DTC P009C Fuel Pressure Relief Control Circuit Low
- DTC P009D Fuel Pressure Relief Control Circuit High
- DTC P009E Fuel Pressure Relief Control Performance/Stuck
- DTC P009F Fuel Pressure Relief Control Stuck On
- DTC P00A0 Charge Air Cooler Temperature Sensor Circuit Bank 2
- DTC P00A1 Charge Air Cooler Temperature Sensor Circuit Range/Performance Bank 2
- DTC P00A5 Intake Air Temperature Sensor 2 Circuit Bank 2
- DTC P00A6 Intake Air Temperature Sensor 2 Circuit Range/Performance Bank 2
- DTC P00AC Intake Air Temperature Sensor 1 Circuit Low Bank 2
- DTC P00AD Intake Air Temperature Sensor 1 Circuit High Bank 2
- DTC P00AE Intake Air Temperature Sensor 1 Circuit Intermittent Bank 2
- DTC P00AF Turbocharger/Supercharger Boost Control ‘A’ Module Performance
- DTC P00B1 Radiator Coolant Temperature Sensor Circuit
- DTC P00B2 Radiator Coolant Temperature Sensor Circuit Range/Performance
- DTC P00B6 Engine Coolant Temperature Correlation
- DTC P00B8 MAP – Mass or Volume Air Flow Correlation Bank 2
- DTC P00C0 Turbocharger/Supercharger Bypass Valve ‘B’ Control Circuit
- DTC P00C1 Turbocharger/Supercharger Bypass Valve ‘B’ Control Circuit Low
- DTC P0100 Mass or Volume Air Flow Sensor “A” Circuit
- DTC P0101 Mass or Volume Air Flow Sensor “A” Circuit Range/Performance
- DTC P0102 Mass or Volume Air Flow Sensor “A” Circuit Low
- DTC P0103 Mass or Volume Air Flow Sensor “A” Circuit High
- DTC P0104 Mass or Volume Air Flow Sensor “A” Circuit Intermittent
- DTC P0105 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit
- DTC P0106 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Range/Performance
- DTC P0107 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Low
- DTC P0108 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit High
- DTC P0109 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Intermittent
- DTC P0110 Intake Air Temperature Sensor 1 Circuit Bank 1
- DTC P0111 Intake Air Temperature Sensor 1 Circuit Range/Performance Bank 1
- DTC P0112 Intake Air Temperature Sensor 1 Circuit Low Bank 1
- DTC P0113 Intake Air Temperature Sensor 1 Circuit High Bank 1
- DTC P0114 Intake Air Temperature Sensor 1 Circuit Intermittent Bank 1
- DTC P0115 Engine Coolant Temperature Sensor 1 Circuit
- DTC P0116 Engine Coolant Temperature Sensor 1 Circuit Range/Performance
- DTC P0117 Engine Coolant Temperature Sensor 1 Circuit Low
- DTC P0118 Engine Coolant Temperature Sensor 1 Circuit High
- DTC P0119 Engine Coolant Temperature Sensor 1 Circuit Intermittent/Erratic
- DTC P0120 Throttle/Pedal Position Sensor/Switch “A” Circuit
- DTC P0121 Throttle/Pedal Position Sensor/Switch “A” Circuit Range/Performance
- DTC P0122 Throttle/Pedal Position Sensor/Switch “A” Circuit Low
- DTC P0123 Throttle/Pedal Position Sensor/Switch “A” Circuit High
- DTC P0124 Throttle/Pedal Position Sensor/Switch “A” Circuit Intermittent
- DTC P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
- DTC P0126 Insufficient Coolant Temperature for Stable Operation
- DTC P0127 Intake Air Temperature Too High
- DTC P0130 O2 Sensor Circuit Bank 1 Sensor 1
- DTC P0131 O2 Sensor Circuit Low Voltage Bank 1 Sensor 1
- DTC P0132 O2 Sensor Circuit High Voltage Bank 1 Sensor 1
- DTC P0133 O2 Sensor Circuit Slow Response Bank 1 Sensor 1
- DTC P0134 O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1
- DTC P0136 O2 Sensor Circuit Bank 1 Sensor 2
- DTC P0137 O2 Sensor Circuit Low Voltage Bank 1 Sensor 2
- DTC P0138 O2 Sensor Circuit High Voltage Bank 1 Sensor 2
- DTC P0168 Fuel Temperature Too High
- DTC P0170 Fuel Trim Bank 1
- DTC P0171 System Too Lean Bank 1
- DTC P0172 System Too Rich Bank 1
- DTC P0176 Fuel Composition Sensor Circuit
- DTC P0177 Fuel Composition Sensor Circuit Range/Performance
- DTC P0178 Fuel Composition Sensor Circuit Low
- DTC P0179 Fuel Composition Sensor Circuit High
- DTC P0190 Fuel Rail Pressure Sensor Circuit Malfunction
- DTC P0192 Fuel Rail Pressure Sensor Circuit
- DTC P0193 Fuel Rail Pressure Sensor Circuit
- DTC P0195 Engine Oil Temperature Sensor “A” Circuit
- DTC P0196 Engine Oil Temperature Sensor “A” Range/Performance
- DTC P0197 Engine Oil Temperature Sensor “A” Circuit Low
- DTC P0198 Engine Oil Temperature Sensor “A” Circuit High
- DTC P0199 Engine Oil Temperature Sensor “A” Circuit Intermittent/Erratic
- DTC P0200 Injector Circuit/Open
- DTC P0201 Cylinder 1 Injector Circuit malfunction
- DTC P0213 Cold Start Injector 1 malfunction
- DTC P0220 Throttle/Pedal Position Sensor/Switch “B” Circuit
- DTC P0221 Throttle/Pedal Position Sensor/Switch “B” Circuit Range/Performance
- DTC P0222 Throttle/Pedal Position Sensor/Switch “B” Circuit Low
- DTC P0230 Fuel Pump Primary Circuit Malfunction
- DTC P0299 Turbocharger/Supercharger Underboost Condition
- DTC P0300 Random/Multiple Cylinder Misfire Detected
- DTC P0301 Cylinder 1 Misfire Detected
- DTC P0302 Cylinder 2 Misfire Detected
- DTC P0303 Cylinder 3 Misfire Detected
- DTC P0304 Cylinder 4 Misfire Detected
- DTC P0305 Cylinder 5 Misfire Detected
- DTC P0306 Cylinder 6 Misfire Detected
- DTC P0307 Cylinder 7 Misfire Detected
- DTC P0308 Cylinder 8 Misfire Detected
- DTC P0309 Cylinder 9 Misfire Detected
- DTC P0310 Cylinder 10 Misfire Detected
- DTC P0311 Cylinder 11 Misfire Detected
- DTC P0312 Cylinder 12 Misfire Detected
- DTC P0315 Crankshaft Position System Variation Not Learned
- DTC P0316 Engine Misfire Detected on Startup (First 1000 Revolutions)
- DTC P0317 Rough Road Hardware Not Present
- DTC P0318 Rough Road Sensor “A” Signal Circuit
- DTC P0319 Rough Road Sensor “B” Signal Circuit
- DTC P0320 Ignition/Distributor Engine Speed Input Circuit
- DTC P0401 EGR “A” Flow Insufficient Detected
- DTC P0411 AIR System Incorrect Flow Detected
- DTC P0420 Catalyst System Efficiency Below Threshold Bank 1
- DTC P0441 EVAP System Incorrect Purge Flow
- DTC P0446 EVAP System Vent Control Circuit Malfunction
- DTC P250B Engine Oil Level Sensor Circuit Range/Performance
- DTC P2B58 Engine Coolant Flow Control Valve Motor Current High
- DTC P2B59 Engine Coolant Flow Control Valve Control Circuit/Open
- DTC P2B5A Engine Coolant Flow Control Valve Control Circuit Low
- DTC P2B5B Engine Coolant Flow Control Valve Control Circuit
- DTC P2B5C Engine Coolant Flow Control Valve Supply Circuit Low
- DTC U0167 Lost Communication With Vehicle Immobilizer Control Module
- DTC U0242 Lost Communication With Headlamp Control Module “B”
- DTC U0267 Lost Communication With Image Processing Sensor C
- DTC U0327 Software Incompatibility With Vehicle Security Control Module
- DTC U0603 Lost Communication With Fuel Pressure Sensor “A”