Is your VW Touran acting up? The Obdii Vw Touran system is designed to pinpoint issues, and at CARDIAGTECH.NET, we’re here to help you understand it. By using an OBDII scanner, you can effectively diagnose your VW Touran, potentially saving time and money. Let’s dive into understanding the OBDII system in your VW Touran, common trouble codes, and how CARDIAGTECH.NET can provide the tools and support you need for efficient auto repairs and maintenance.
1. Understanding OBDII System in VW Touran
The On-Board Diagnostic II (OBDII) system is a standardized system implemented in most vehicles, including the VW Touran, to monitor engine performance, emissions, and other critical systems. Its primary function is to detect malfunctions, store diagnostic trouble codes (DTCs), and alert the driver via the check engine light. This system enables technicians and vehicle owners to identify and address issues efficiently.
1.1. What is OBDII?
OBDII is an electronic system that self-monitors a vehicle’s engine and transmission. It provides real-time data and diagnostic trouble codes that can be read with a scanner. According to the Environmental Protection Agency (EPA), OBDII was standardized in 1996 to ensure all vehicles meet emission standards.
1.2. How Does OBDII Work in VW Touran?
In your VW Touran, the OBDII system monitors various sensors and components, such as the engine, transmission, exhaust system, and fuel system. When a sensor detects a problem, it sends a signal to the vehicle’s computer (ECU), which logs a diagnostic trouble code (DTC). This DTC illuminates the check engine light, indicating that the vehicle needs attention. The DTC can then be read using an OBDII scanner.
1.3. Benefits of Using OBDII Scanners
Using OBDII scanners offers several benefits for VW Touran owners and technicians:
- Early Detection: Identifies potential problems before they cause significant damage.
- Cost Savings: Enables DIY repairs, reducing expensive trips to the mechanic.
- Informed Decisions: Provides accurate diagnostic information, ensuring informed repair decisions.
- Emission Compliance: Helps maintain emission standards, preventing environmental damage and fines.
- Performance Monitoring: Allows real-time monitoring of vehicle performance.
2. Common OBDII Codes for VW Touran
Understanding common OBDII codes specific to VW Touran can help you diagnose and address issues more efficiently. Here’s a list of frequent codes and their potential causes:
2.1. Engine-Related Codes
| Code | Description | Possible Causes |
|---|---|---|
| P0011 | Camshaft Position A – Timing Over-Advanced or System Performance (Bank 1) | Low engine oil level, Incorrect engine timing, Oil not meeting manufacturer’s requirements, Variable valve timing actuator failure, Worn timing chain. |
| P0101 | Mass Air Flow (MAF) Sensor Circuit Range/Performance | Large vacuum leaks, Split Intake Air Boot or PCV Hose, Defective intake manifold gaskets, Mass Airflow Sensor (MAF) failure, Circuit wiring problems, Defective Barometric Pressure Sensor, Dirty or contaminated MAF sensing wire or filament, PCM software update needed. |
| P0171 | System Too Lean (Bank 1) | Vacuum leaks (intake manifold gaskets, vacuum hoses, PCV hoses, etc.), Mass air flow sensor failure, Plugged fuel filter or weak fuel pump, Plugged or dirty fuel injectors, Control module software update needed. |
| P0300 | Random Multiple Cylinder Misfire Detected | Worn spark plugs, ignition wires, coil(s), distributor cap and rotor, Incorrect ignition timing, Vacuum leak(s), Low or weak fuel pressure, Improperly functioning EGR system, Defective Mass Air Flow Sensor, Crankshaft and/or Camshaft Sensor failure, Defective Throttle Position Sensor, Mechanical engine problems (low compression, leaking head gasket(s), or valve issues). |
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) | Inefficient Catalytic Converter(s), Defective Front or Rear Oxygen Sensor(s), Misfiring engines. |
| P0128 | Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) | Defective Engine Thermostat, Defective Engine Coolant Temperature Sensor, Defective Intake Air Temperature Sensor, Defective Cooling System, Low Engine Coolant, Dirty Engine Coolant, Defective/always running Engine Cooling fan(s). |
| P2181 | Cooling System Performance | Engine coolant heater failure, Engine coolant level is too low, Thermostat failure. |
| P2004 | Intake Manifold Runner Control Stuck Open (Bank 1) | A failed IMRC actuator, A problem with the intake manifold or linkage, Wiring issues. |
| P0507 | Idle Air Control System RPM Higher Than Expected | Defective/sticking Idle Air Control Motor, Intake Manifold Vacuum leaks, Carbon buildup in the Throttle Body air passages, Defective Coolant Temperature Sensor, Defective Charging System/Alternator, Defective Power Steering Pressure Switch. |
| P0135 | O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1) | Defective Oxygen Sensor/Air Fuel Ratio Sensor, defective Oxygen Sensor/Air Fuel Ratio Sensor Heater Circuit, Exhaust System Leak, Intake Air System leak, Low Fuel Pressure, Defective Engine Coolant Temperature Sensor, Defective sensor wiring and/or circuit problem, PCM software needs to be updated, Defective PCM. |
| P0010 | “A” Camshaft Position Actuator Circuit/Open (Bank 1) | Powertrain Control Module (PCM) failure, Variable valve timing actuator failure, Wiring issue. |
| P0012 | “A” Camshaft Position – Timing Over-Retarded (Bank 1) | Camshaft variable timing solenoid failure, Engine oil level is too low, The engine is not timed correctly, The engine oil does not meet the manufacturer’s requirements, Variable valve timing actuator failure, Worn timing chain. |
| P0013 | “A” Camshaft Position Actuator Circuit/Open (Bank 1) | Powertrain Control Module (PCM) failure, Variable valve timing actuator failure, Wiring issue. |
| P0014 | “A” Camshaft Position – Timing Over-Advanced or System Performance (Bank 1) | Camshaft variable timing solenoid failure, Engine oil level is too low, The engine is not timed correctly, The engine oil does not meet the manufacturer’s requirements, Variable valve timing actuator failure, Worn timing chain. |
| P0102 | Mass Air Flow (MAF) Sensor Circuit Low Input | The Mass Airflow Sensor (MAF) Sensor is unplugged or the wiring is damaged, Loose or corroded electrical terminals in the MAF Sensor circuit, Faulty MAF Sensor. |
| P0113 | Intake Air Temperature Circuit High Input | Defective Intake Air Temperature Sensor, Dirty air filter, Defective Mass Air Flow Sensor, Faulty or corroded Intake Air Temperature Sensor wiring or connections. |
| P0174 | System Too Lean (Bank 2) | PCM software needs to be updated, Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.), Faulty Mass Airflow (MAF) Sensor, Plugged Fuel Filter or weak Fuel Pump, Plugged or dirty Fuel Injectors. |
| P0200 | Injector Circuit Malfunction | Defective Fuel Injector, Faulty or corroded Fuel Injector, wiring, and/or connections, Plugged Fuel Injector, Dirt in the Fuel Injector. |
| P0201 | Cylinder 1 Injector Circuit Malfunction | Defective Fuel Injector, Faulty or corroded Fuel Injector, wiring, and/or connections, Plugged Fuel Injector, Dirt in the Fuel Injector. |
| P0202 | Cylinder 2 Injector Circuit Malfunction | Malfunction of the Fuel Injector, Malfunction of the PCM Fuel Injector driver circuit, Defective wiring/connections in the Fuel Injector wiring harness, Defective Fuel Injector power circuit(s). |
| P0203 | Cylinder 3 Injector Circuit Malfunction | Fuel injector failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P0205 | Cylinder 5 Injector Circuit Malfunction | Fuel injector failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P0301 | Cylinder 1 Misfire Detected | Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable), Incorrect ignition timing, Vacuum leak(s), Low or weak fuel pressure, Improperly functioning EGR system, Defective Mass Air Flow Sensor, Defective Crankshaft and/or Camshaft Sensor, Defective Throttle Position Sensor, Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems). |
| P0302 | Cylinder 2 Misfire Detected | Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable), Incorrect ignition timing, Vacuum leak(s), Low or weak fuel pressure, Improperly functioning EGR system, Defective Mass Air Flow Sensor, Defective Crankshaft and/or Camshaft Sensor, Defective Throttle Position Sensor, Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems). |
| P0303 | Cylinder 3 Misfire Detected | Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable), Incorrect ignition timing, Vacuum leak(s), Low or weak fuel pressure, Improperly functioning EGR system, Defective Mass Air Flow Sensor, Defective Crankshaft and/or Camshaft Sensor, Defective Throttle Position Sensor, Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems). |
| P0304 | Cylinder 4 Misfire Detected | Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable), Incorrect ignition timing, Vacuum leak(s), Low or weak fuel pressure, Improperly functioning EGR system, Defective Mass Air Flow Sensor, Defective Crankshaft and/or Camshaft Sensor, Defective Throttle Position Sensor, Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems). |
| P0401 | Insufficient EGR Flow Detected | Restriction in the EGR passages (usually caused by carbon buildup), The EGR Valve is defective, Lack of proper vacuum or electrical signal to the EGR valve, Malfunctioning EGR Vacuum supply solenoid, Lack of proper EGR system feedback to the computer from the: Manifold Absolute Pressure Sensor (MAP), Differential EGR Pressure Feedback Sensor (DPFE), EGR Valve Position Sensor (EVP), EGR Temperature Sensor. |
| P0430 | Catalyst System Efficiency Below Threshold (Bank 2) | Defective Catalytic Converter, Internal engine damage resulting in high oil consumption and/or a leaking Head Gasket has damaged the Catalytic Converter. |
| P0500 | Vehicle Speed Sensor Malfunction | Defective Vehicle Speed Sensor, Defective Speedometer, Vehicle Speed Sensor wiring or connector, Communication (CAN) bus problems, Defective transmission or differential Vehicle Speed Sensor drive gear. |
| P0501 | Vehicle Speed Sensor Range/Performance | Defective Vehicle Speed Sensor, Defective Speedometer, Vehicle Speed Sensor wiring or connector, Communication (CAN) bus problems, Defective transmission or differential Vehicle Speed Sensor drive gear. |
| P0505 | Idle Air Control System Malfunction | Defective Idle Air Control Motor, Intake Manifold Vacuum leaks, Carbon buildup in the Throttle Body air passages. |
| P0506 | Idle Air Control System RPM Lower Than Expected | Defective/sticking Idle Air Control Motor, Intake Manifold Vacuum leaks, Carbon buildup in the Throttle Body air passages, Defective Power Steering Pressure Switch. |
| P0600 | Serial Communication Link Malfunction | Defective PCM (Power Train Control Module), Defective PCM data bus wiring/connections, Defective PCM data bus ground circuit(s), Defective PCM or other control module controlled output devices, Defective CAN bus communication. |
| P0601 | Internal Control Module Memory Check Sum Error | Lack of proper voltage to the PCM, Defective PCM memory module, Defective PCM ground circuit(s), Defective PCM controlled output devices. |
| P0602 | Control Module Programming Error | Powertrain Control Module (PCM) failure, Wiring issue. |
| P0603 | Internal Control Module Keep Alive Memory (KAM) Error | Lack of proper voltage to the Keep Alive Memory connection on the PCM, Defective PCM Keep Alive Memory Module (KAM), Defective PCM ground circuit(s), Defective PCM controlled output devices. |
| P0605 | Internal Control Module Read Only Memory (ROM) Error | Lack of proper voltage and/or ground to the PCM, Defective PCM ROM memory module, Defective PCM ground circuit(s), Defective PCM controlled output devices. |
| P2000 | NOx Adsorber Efficiency Below Threshold Bank 1 | Diesel Particulate Filter (DPF) failure, Intake air leak, Mass Airflow (MAF) sensor is dirty/loss of calibration. |
| PP2002 | Diesel Particulate Filter Efficiency Below Threshold | Diesel Particulate Filter (DPF) failure, Intake air leak, Mass Airflow (MAF) sensor is dirty/loss of calibration. |
| P2006 | Intake Manifold Runner Control Stuck Closed Bank 1 | Intake manifold runner control actuator failure, Powertrain Control Module (PCM) failure, Restricted vacuum lines. |
| P2101 | Throttle Actuator Control Motor Circuit Range/Performance | Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle control motor failure, Wiring issue. |
| P2122 | Throttle/Pedal Position Sensor/Switch D Circuit Low Input | Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle control motor failure, Wiring issue. |
| P2135 | Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation | Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle Position Sensor (TPS) failure, Wiring issue. |
| P2138 | Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation | Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle Position Sensor (TPS) failure, Wiring issue. |
| P2210 | NOx Sensor Circuit Malfunction Bank 1 | NOx sensor failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2213 | NOx Sensor Circuit Malfunction Bank 2 | NOx sensor failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2237 | O2 Sensor Positive Current Control Circuit Open Bank 1 Sensor 1 | Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2238 | O2 Sensor Positive Current Control Circuit Shorted to Ground Bank 1 Sensor 1 | Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2251 | O2 Sensor Negative Current Control Circuit Open Bank 1 Sensor 1 | Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2302 | Ignition Coil A Secondary Circuit | Ignition coil failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2303 | Ignition Coil B Secondary Circuit | Ignition coil failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2305 | Ignition Coil C Secondary Circuit | Ignition coil failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2308 | Ignition Coil D Secondary Circuit | Ignition coil failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2310 | Ignition Coil E Secondary Circuit | Ignition coil failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2401 | Evaporative Emission System Leak Detection Pump Control Circuit Open | Evap leak detection pump failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2402 | Evaporative Emission System Leak Detection Pump Control Circuit Shorted | Evap leak detection pump failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2422 | Evaporative Emission System Vent Valve Stuck Closed | EVAP vent valve failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2431 | Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 1 | Air control solenoid failure, Powertrain Control Module (PCM) failure, Secondary Air System pressure sensor failure, Wiring issue. |
| P2432 | Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 2 | Air control solenoid failure, Powertrain Control Module (PCM) failure, Secondary Air System pressure sensor failure, Wiring issue. |
| P2500 | Generator Lamp/L Terminal Circuit Low | Alternator failure, Battery failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2501 | Generator Lamp/L Terminal Circuit High | Alternator failure, Battery failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2503 | Charging System Voltage Low | Alternator failure, Battery failure, Wiring issue. |
| P2509 | ECM/PCM Power Input Signal Intermittent | Powertrain Control Module (PCM) failure, Powertrain Control Module (PCM) power relay failure, Wiring issue. |
| P250C | Engine Oil Level Sensor Circuit Range/Performance | Oil level sensor failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2601 | Coolant Pump “A” Control Circuit/Open | Coolant Heat Storage (CHS) water pump failure, Coolant Heat Storage (CHS) water pump relay, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2607 | Intake Air Heater “A” Control Circuit Low | Intake air heater, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2609 | Intake Air Heater “A” Control Circuit High | Intake air heater, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2610 | Internal Engine Off Timer Performance | An internal PCM problem, A problem with the PCM power or ground circuit. |
| P2614 | Camshaft Position Sensor “B” Circuit Intermittent | Broken tone ring, Camshaft Position Sensor (CMP) failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2706 | Transmission Friction Element “E” Apply Time Range/Performance | Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission shift solenoid failure, Wiring issue. |
| P2711 | Unexpected Mechanical Gear Disengagement | Internal transmission failure, Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission solenoid failure, Wiring issue. |
| P2714 | Pressure Control Solenoid “D” Performance or Stuck Off | Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission shift solenoid failure, Wiring issue. |
| P2716 | Pressure Control Solenoid “D” Electrical | Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission shift solenoid failure, Wiring issue. |
| P2723 | Pressure Control Solenoid “E” Performance or Stuck Off | Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission shift solenoid failure, Wiring issue. |
| P2803 | Transmission Range Sensor “B” Circuit | Powertrain Control Module (PCM) failure, Transmission Control Module (TCM) failure, Transmission range sensor failure, Wiring issue. |
| P2806 | Transmission Range Sensor Not Programmed | Powertrain Control Module (PCM) failure, Transmission Control Module (TCM) failure, Transmission range sensor failure, Transmission range sensor is out of adjustment, Wiring issue. |
| P2809 | Pressure Control Solenoid “F” Performance or Stuck Off | Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission pressure control solenoid failure, Wiring issue. |
| P2810 | Pressure Control Solenoid “F” Electrical | Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission pressure control solenoid failure, Wiring issue. |
| P2815 | Pressure Control Solenoid “G” Performance or Stuck Off | Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission pressure control solenoid failure, Wiring issue. |
| P2A00 | O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 | Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2A01 | O2 Sensor Circuit Range/Performance Bank 1 Sensor 2 | Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2A03 | O2 Sensor Circuit Range/Performance Bank 2 Sensor 1 | Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2A04 | O2 Sensor Circuit Range/Performance Bank 2 Sensor 2 | Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2BA8 | NOx Exceedence – Reducing Agent Injection Active | Faulty NOx Sensors, NOx Sensors harness is open or shorted, NOx Sensors circuit poor electrical connection, Fualty Diesel Particulate Filter (DPF). |
| P3000 | High Voltage Battery Voltage Sag | Fuel level is too low, High voltage battery assembly failure, High voltage battery is not sufficiently charged. |
| P3100 | High Voltage Powertrain Control Module Requested MIL Illumination | High voltage powertrain control module failure. |
| P3400 | Cylinder Deactivation System Performance | Faulty Cylinder Deactivation System/td. |
| P3401 | Cylinder 1 Deactivation System Performance | Engine oil level is too low, Powertrain Control Module (PCM) failure, Variable valve timing solenoid failure, Wiring issue. |
2.2. Transmission-Related Codes
| Code | Description | Possible Causes |
|---|---|---|
| P0700 | Transmission Control System Malfunction | Defective Shift Solenoids, Defective Engine Coolant Temperature Sensor, Defective Valve Body, Dirty transmission fluid that restricts the hydraulic passages. |
| P0705 | Transmission Range Sensor Circuit Malfunction | Defective Transmission Range Sensor (PRNDL input), Defective Transmission Range Sensor (PRNDL input) wiring or connector, Defective Valve Body, Defective manual shift valve linkage, Dirty transmission fluid that restricts the hydraulic passages. |
| P0706 | Transmission Range Sensor Circuit Range/Performance | Defective Transmission Range Sensor (PRNDL input), Defective Transmission Range Sensor (PRNDL input) wiring or connector, Defective Valve Body, Defective manual shift valve linkage, Dirty transmission fluid that restricts the hydraulic passages. |
| P0720 | Output Speed Sensor Circuit Malfunction | Defective Output Speed Sensor, Defective Shift Solenoids, Defective Engine Coolant Temperature Sensor, Defective Valve Body, Dirty transmission fluid that restricts the hydraulic passages, Defective Output Speed Sensor wiring or connector. |
| P0730 | Incorrect Gear Ratio | Defective Shift Solenoids, Defective Engine Coolant Temperature Sensor, Defective Valve Body, Dirty transmission fluid that restricts the hydraulic passages. |
| P0841 | Transmission Fluid Pressure Sensor/Switch A Circuit Range | Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue. |
| P0842 | Transmission Fluid Pressure Sensor/Switch A Circuit Low | Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue. |
| P0845 | Transmission Fluid Pressure Sensor/Switch B Circuit | Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue. |
| P0846 | Transmission Fluid Pressure Sensor/Switch B Circuit Range | Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue. |
| P0847 | Transmission Fluid Pressure Sensor/Switch B Circuit Low | Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue. |
| P0901 | Clutch Actuator Circuit Range/Performance | Clutch master cylinder failure, Clutch solenoid failure, Transmission Control Module (TCM) failure. |
| P0935 | Hydraulic Pressure Sensor Circuit Range/Performance | Hydraulic power unit assembly failure, Transmission Control Module (TCM) failure, Wiring issue. |
| P0942 | Hydraulic Pressure Unit Malfunction | Hydraulic power unit assembly failure, Transmission Control Module (TCM) failure, Wiring issue. |
| P0944 | Hydraulic Pressure Unit Loss of Pressure | Clogged transmission filter, Transmission fluid level is low, Transmission oil pump failure, Wiring issue. |
| P0961 | Pressure Control Solenoid A Control Circuit Range/Performance | Transmission shift solenoid failure. |
2.3. Emission System Codes
| Code | Description | Possible Causes |
|---|---|---|
| P0440 | Evaporative Emission Control System Malfunction | Missing fuel cap, Defective or damaged fuel cap, Distorted or damaged Fuel Tank Filler Neck, Torn or punctured Evaporative system hose(s), Defective Fuel Tank Sending Unit gasket or seal, Split or damaged Carbon Canister, Defective Evaporative Vent Valve and/or Evaporative Purge Valve, Defective or damaged fuel tank. |
| P0441 | Evaporative Emission Control System Incorrect Purge Flow | Missing fuel cap, Stuck open or closed purge valve, Defective or damaged fuel cap, Distorted, damaged or cracked Fuel Tank Filler Neck, Torn or punctured Evaporative system hose(s), Defective Fuel Tank Sending Unit gasket or seal, Split or damaged Carbon Canister, Defective Evaporative Vent Valve, Defective or damaged fuel tank. |
| P0442 | Evaporative Emission Control System Leak Detected (Small Leak) | Defective or damaged fuel cap, Distorted or damaged Fuel Tank Filler Neck, Small tear or puncture in the Evaporative system hose(s) and/or Carbon Canister, Defective Fuel Tank Sending Unit gasket or seal, Small split in a seam of the Carbon Canister, Defective Evaporative Vent Valve and/or Evaporative Purge Valve, Defective or damaged Fuel Tank, Defective Fuel Tank Pressure Sensor, Defective Leak Detection Pump, Slightly loose and/or worn clamps or hardened O-rings anywhere in the EVAP system. |
| P0455 | Evaporative Emission Control System Leak Detected (Gross Leak) | Missing fuel cap, Defective or damaged fuel cap, Distorted or damaged Fuel Tank Filler Neck, Torn or punctured Evaporative system hose(s), Defective Fuel Tank Sending Unit gasket or seal, Split or damaged Carbon Canister, Defective Evaporative Vent Valve and/or Evaporative Purge Valve, Defective or damaged fuel tank, Defective Fuel Tank Pressure Sensor. |
| P2401 | Evaporative Emission System Leak Detection Pump Control Circuit Open | Evap leak detection pump failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2402 | Evaporative Emission System Leak Detection Pump Control Circuit Shorted | Evap leak detection pump failure, Powertrain Control Module (PCM) failure, Wiring issue. |
| P2422 | Evaporative Emission System Vent Valve Stuck Closed | EVAP vent valve failure, Powertrain Control Module (PCM) failure, Wiring issue. |
2.4. Electrical System Codes
| Code | Description | Possible Causes |
|---|---|---|
| B0081 | Driver Seat Position Sensor Circuit Malfunction | Wiring issues, Control module problems, A problem with the airbag. |
| C0040 | Right Front Wheel Speed Sensor Circuit Malfunction | A faulty wheel speed sensor, A problem with the wheel speed sensor circuit, Reluctor issues, A problem with the ABS module. |
| U0001 | High Speed CAN Communication Bus | A faulty wheel speed sensor, A problem with the wheel speed sensor circuit, Reluctor issues, A problem with the ABS module. |
| U0073 | Control Module Communication Bus Off | A faulty control module, A problem with the CAN bus. |
| U0100 | Lost Communication with Engine Control Module/PCM | A faulty PCM, A problem with the control module circuit, A problem with the CAN bus. |
| U0107 | Lost Communication with Throttle Actuator Control Module | A dead battery, A faulty TAC module, A problem with TAC module circuit, A problem with the CAN bus. |
| U0121 | Lost Communication with Anti-Lock Brake System (ABS) Control Module | A dead battery, A faulty ABS module, A problem with ABS module circuit, A problem with the CAN bus. |
3. Step-by-Step Guide to Diagnosing Your VW Touran with OBDII
Diagnosing your VW Touran using an OBDII scanner can be
