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9,253 diagnostic guides

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Find codes by symptomChoose what you notice to search matching code guides.

Rough idle or shakingVibration while stopped Hard to startLong cranking or no-start Engine stallsCuts out at idle or on the road Hesitates or loses powerSlow response when accelerating Battery light is onCharging system warning Harsh gear changesDelayed or rough shifting

A symptom can have several causes. Treat matching codes as clues and follow the diagnostic checks in each guide.

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Engine1049 Emissions515 Fuel1016 Sensors & Electronics2110 Transmission866 Electrical & Charging1797 Body & Restraints193 Chassis & Brakes479 Network & Communication1228

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All severities9253 Low priority305 Check soon8256 Urgent621

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All families9253 P · Powertrain7353 B · Body193 C · Chassis479 U · Network1228

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These are generic OBD2 definitions. Exact make, model, engine, and year compatibility will appear after vehicle-fitment data is added.

Diagnostic codes

Showing 1–24 of 66

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P0089Fuel Pressure Regulator 1 PerformanceCheck soonFuel System45–120 minutes for initial diagnosisP0089 means Fuel Pressure Regulator 1 Performance. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0093Fuel System Leak Detected — Large LeakUrgentFuel System1–3 hours for initial diagnosisP0093 means Fuel System Leak Detected — Large Leak. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0217Engine Overtemperature ConditionUrgentEngine Problems1–3 hours for initial diagnosisP0217 means Engine Overtemperature Condition. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0340Camshaft Position Sensor Circuit MalfunctionSensors & ElectronicsFix P0340 camshaft sensor code. Learn about cam position sensor function and replacement.P0011Camshaft Position Timing Over-Advanced Bank 1Engine ProblemsFix P0011 variable valve timing code. Learn what causes over-advanced cam timing on Bank 1 and how to repair it.P0075Intake Valve Control Solenoid Circuit Bank 1Check soonEngine Problems45–120 minutes for initial diagnosisP0075 means Intake Valve Control Solenoid Circuit Bank 1. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0078Exhaust Valve Control Solenoid Circuit Bank 1Check soonEngine Problems45–120 minutes for initial diagnosisP0078 means Exhaust Valve Control Solenoid Circuit Bank 1. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0087Fuel Rail/System Pressure Too Low - Causes & FixesFuel SystemUnderstand P0087 fuel rail pressure too low code - common causes like a failing fuel pump or clogged filter, and how to fix it.P0090Fuel Pressure Regulator 1 Control CircuitCheck soonFuel System45–120 minutes for initial diagnosisP0090 means Fuel Pressure Regulator 1 Control Circuit. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0101MAF Sensor Circuit Range/Performance ProblemCheck soonSensors & Electronics30–90 minutesFix P0101 mass air flow sensor code. Learn how to clean, test, and replace your MAF sensor to restore performance.P0102Mass Air Flow Sensor Circuit Low InputSensors & ElectronicsFix P0102 MAF low input code. Learn why your mass air flow sensor reads low and how to clean, test, or replace it.P0106MAP Sensor Range/Performance ProblemSensors & ElectronicsLearn what triggers P0106 MAP sensor range/performance code and how to fix an implausible manifold pressure reading.P0190Fuel Rail Pressure Sensor A CircuitCheck soonFuel System45–120 minutes for initial diagnosisP0190 means Fuel Rail Pressure Sensor A Circuit. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0200Injector Circuit/OpenCheck soonFuel System45–120 minutes for initial diagnosisP0200 means Injector Circuit/Open. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0207Injector Circuit/Open Cylinder 7Check soonFuel System45–120 minutes for initial diagnosisP0207 means Injector Circuit/Open Cylinder 7. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0219Engine Overspeed ConditionUrgentEngine Problems1–3 hours for initial diagnosisP0219 means Engine Overspeed Condition. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0230Fuel Pump Primary Circuit MalfunctionFuel SystemFix P0230 fuel pump primary circuit code - relay, wiring, and fuel pump control module causes and solutions.P0336Crankshaft Position Sensor Range/PerformanceEngine ProblemsFix P0336 crankshaft position sensor range/performance code - a common cause of stalling and hard starts.P0402EGR Excessive Flow Detected - Causes & FixesEmissions SystemDiagnose the P0402 excessive EGR flow code, including stuck valves, blocked passages, and how to test the system.P0505Idle Air Control System MalfunctionEngine ProblemsDiagnose P0505 idle control code. Learn about the IAC valve and how to fix idle speed problems.P0562System Voltage LowElectrical & Charging SystemFix P0562 system voltage low code. Learn what causes low charging voltage and how to test the battery and alternator.P0740Torque Converter Clutch Circuit MalfunctionTransmission IssuesDiagnose P0740 torque converter clutch code. Learn about TCC operation and what causes lockup problems.P0001Fuel Volume Regulator Control Circuit/OpenCheck soonFuel System45–120 minutes for initial diagnosisP0001 means Fuel Volume Regulator Control Circuit/Open. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0002Fuel Volume Regulator Control Circuit Range/PerformanceCheck soonFuel System45–120 minutes for initial diagnosisP0002 means Fuel Volume Regulator Control Circuit Range/Performance. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.