Complete VW Engine Error Codes Guide: Diagnostic Trouble Codes & Solutions
Key Takeaways
| Error Code | Main Symptoms | Common Causes |
|---|---|---|
| P0087 | Engine power loss, poor acceleration | Low fuel pressure, HPFP failure |
| P0299 | Reduced power, limp mode activation | Turbo failure, boost leaks |
| P0300-P0304 | Engine misfiring, rough idle | Ignition system, fuel injectors |
| P0420 | Check engine light, failed emissions | Catalytic converter failure |
| P2463 | DPF warning light, reduced power | Diesel particulate filter clogged |
| P1570 | Engine won’t start, security light | Immobilizer system malfunction |
Volkswagen vehicles utilize sophisticated engine management systems that monitor dozens of sensors and components. When faults occur, these systems generate Diagnostic Trouble Codes (DTCs) to help technicians identify problems quickly and accurately.
Understanding these error codes is essential for VW owners in South Africa, as proper diagnosis can prevent minor issues from becoming expensive repairs. This comprehensive guide covers the most common VW engine error codes, their symptoms, causes, and solutions.
How to Read VW Error Codes
Before diving into specific codes, it’s important to understand how to retrieve and interpret these diagnostic messages using an OBD-II scanner or professional diagnostic equipment.
Equipment Needed:
- OBD-II scanner or professional diagnostic tool
- Vehicle’s diagnostic port (usually under dashboard)
- VCDS/VAG-COM for advanced VW-specific diagnostics
Reading Process:
- Connect scanner to OBD-II port
- Turn ignition to ON position (don’t start engine)
- Select “Read Codes” or “Scan for DTCs”
- Note down any codes displayed
- Clear codes after repairs (if appropriate)
Fuel System Codes
P0087 - Low Fuel Rail Pressure
Description: Error code P0087 indicates a decrease in pressure in the fuel system.
Causes
- Damage to high or low pressure fuel lines
- Damage to connectors or electrical harnesses
- Wear of fuel pump or high-pressure fuel pump (HPFP)
- Nozzle clogging or fuel injector problems
- Malfunction of the fuel system controller
- Failure of the pressure control valve
Symptoms
- Reduced engine power and poor acceleration
- Engine entering limp mode
- Difficulty starting, especially when cold
- Check engine light activation
- Poor fuel economy
Solution
- Test fuel system pressure with professional gauge
- Inspect and replace damaged fuel lines
- Replace high-pressure fuel pump if faulty
- Clean or replace clogged fuel injectors
- Check and repair electrical connections
DIY Difficulty / Hours
- Fuel pressure testing: Intermediate / 2-3 hours
- HPFP replacement: Expert only / 8-12 hours
- Fuel line repair: Advanced / 4-6 hours
Cost: R8,000-R25,000 for HPFP replacement and programming
Boost System Codes
P0299 - Underboost Condition
Description: The code P0299 indicates reduced boost pressure from the turbocharger system.
Causes
- Reduced engine oil pressure affecting turbo lubrication
- Failure of turbocharger or wastegate actuator
- Malfunctions in the EGR system
- Clogged air filter or restrictions in intake manifold
- Breakdown of boost pressure controller
- Intercooler leaks or boost pipe damage
Symptoms
- Check engine light activation
- Speed limiter engagement (often 40 km/h maximum)
- Significantly reduced engine power
- Unusual noise from turbocharger or compressor
- Excessive black smoke from exhaust
Solution
- Inspect turbocharger for mechanical damage
- Check boost pipes and intercooler for leaks
- Clean or replace air filter
- Test wastegate actuator operation
- Verify EGR system function
DIY Difficulty / Hours
- Boost leak testing: Intermediate / 2-3 hours
- Turbo inspection: Advanced / 4-6 hours
- Intercooler replacement: Advanced / 6-8 hours
Cost: R15,000-R45,000 for turbocharger replacement
Misfire Codes
P0300 - Random/Multiple Cylinder Misfire
Description: Error code P0300 appears when misfires are detected across multiple cylinders without a specific pattern.
Causes
- Worn or fouled spark plugs
- Faulty ignition coils or spark plug wires
- Fuel delivery problems (injectors, fuel pump)
- Low compression (worn rings, valves)
- Vacuum leaks affecting air/fuel mixture
- Timing chain or belt issues
Symptoms
- Rough engine idle and operation
- Difficulty starting the engine
- Random engine stalling at idle or traffic lights
- Reduced power and acceleration
- Increased fuel consumption
Solution
- Replace spark plugs and inspect condition
- Test ignition coils with multimeter
- Check fuel injector operation and spray pattern
- Perform compression test on all cylinders
- Inspect for vacuum leaks throughout intake system
DIY Difficulty / Hours
- Spark plug replacement: Easy / 1-2 hours
- Ignition coil testing: Intermediate / 2-3 hours
- Compression testing: Advanced / 3-4 hours
Cost: R2,000-R8,000 for spark plugs and ignition coils
P0301-P0304 - Individual Cylinder Misfires
Description: These codes indicate misfires in specific cylinders (P0301 = Cylinder 1, P0302 = Cylinder 2, etc.).
Causes
- Faulty spark plug in specific cylinder
- Failed ignition coil for that cylinder
- Clogged or faulty fuel injector
- Low compression in that cylinder
- Wiring problems to ignition components
Symptoms
- Engine roughness most noticeable at idle
- Reduced power during acceleration
- Check engine light flashing (indicates severe misfire)
- Possible catalytic converter damage if ignored
Solution
- Swap ignition components between cylinders to isolate problem
- Replace faulty spark plug or ignition coil
- Clean or replace problematic fuel injector
- Check compression in affected cylinder
Cost: R500-R2,000 per cylinder for spark plug/coil replacement
Emissions Codes
Common error code. This combination appears in the presence of other faults.
P10A4
Intake inlet flap malfunction
P10A9
Compressor electromagnetic clutch malfunction
P175D
Spontaneous opening in the operation of the clutch system. Most likely, the disk is worn out.
P130A
Malfunction of one of the cylinders, damage to the device
P2BAC
Problems in the operation of the EGR valve, arbitrary shutdown of the device
P2BAB
Exceeding the nitric oxide limit, shutting down the EGR valve
P242F
The control unit reports limitations associated with the particulate filter
P10A900 (P10A9)
Malfunctions in the operation of the throttle valve actuator
P261A
Error code P261A or P261A00 is the result of damage to the electrical circuit of the ventilation, heating and air conditioning system
P0016
Error codes P0016 and P001600 indicate the incorrect relative position of the motor shafts. To solve the problem, a detailed diagnosis of the integrity of the gears on the pulley will be required. Perhaps the cause of the malfunction is a mismatch in the labels.
P0068
Literally, the error translates as “the deviation of the angle of advance of the throttle valve.” A malfunction leads to improper intake air pressure.
P0069
The control unit detected an incorrect ratio in the intake air pressure readings
P0087
Error code P0087 indicates a decrease in pressure in the fuel system.
Possible causes of the malfunction:
- damage to high or low pressure lines;
- damage to connectors or electrical harnesses;
- wear of a pusher TNVD (fuel filter of a high pressure);
- nozzle clogging;
- malfunction of the fuel system controller;
- failure of the pressure control valve.
P0108
The control unit reports an incorrect pressure fixed at the inlet. It is recommended to check the operation of the device G71 and F96, from one of them the wrong signal is sent to the microprocessor.
P0121
Error code P0121 appears as a result of an incorrect pulse from the throttle potentiometer G69
P0171
Error codes P0171 or P017100 appear as a result of depletion of the air-fuel mixture. Defect found in the first row of cylinders.
P0172
The combination 0172 appears as a result of the enrichment of the air-fuel mixture in the first row of cylinders
P0299
The code P0299 or P029900 indicates a reduced boost pressure.
When this malfunction occurs, the following symptoms appear:
- on the control combination, the Check indicator lights up;
- the inclusion of a speed limiter up to 40 km / h;
- the power of the power unit is significantly reduced;
- noise appears in the operation of a turbine or compressor on a diesel engine.
The reasons that led to this error:
- reduced pressure of the engine fluid in the power unit;
- failure of a turbine or discharge device;
- malfunctions in the EGR system (EGR);
- clogged air filter or air intake in the intake manifold;
- breakdown of boost pressure controller.
P0300
Error code P0300 appears as a result of fixing the misfire in one of the engine cylinders. A specific number is not indicated, so you have to search for the cause yourself.
P0301
Combination P0301 reports misfire in the first cylinder of the engine.
Symptoms that may occur with such a malfunction:
- the difficulty of starting the power unit;
- “Triple” of the engine, unstable engine idling;
- random stop of the engine when idling, at traffic lights or in traffic jams.
P0302
The combination P0302 appears as a result of the appearance of misfire in the second cylinder
P0303
Error code P0303 indicates misfires in the third cylinder of the car engine
P0304
Misfire detected in engine fourth cylinder
P0354
Failure in the fourth cylinder of the engine, the problem may be a malfunction of the ignition control system
P0401
Error code P0401 appears when the throughput in the exhaust gas recirculation system is reduced. This combination may be due to wear of the sensors, as well as air leaks.
P0403
Error code P040300 appears as a result of a malfunction in the exhaust gas recirculation valve. This refers to the device N18. The appearance of code P040300 may be due to a violation of the tightness of the system, as well as a malfunction of the control unit.
P0404
Incorrect control range in the exhaust gas recirculation system
P0411
Error code P0411 (0411) indicates a decrease in throughput in the operation of the secondary air supply system
P0420
The combination of P0420 (0420) appears as a result of a decrease in the efficiency in the operation of the catalyst system located in the first row. It is necessary to check the tightness of all components and pipes. Damaged lines must be replaced, and weakened clamps are tightened.
P0441
Error code P044100 literally stands for “incorrect flow in the system for monitoring the removal of fuel vapor”
P0455
The microprocessor module has detected a serious leak in the fuel tank ventilation system
P0456
Error code P0456 reports a minor leak in the fuel tank ventilation system
P0491
Error code P0491 appears as a result of reduced throughput of the secondary air supply system. The fault is recorded in the front row.
P0507
Idle engine speeds above maximum
P0638
Invalid signal from throttle control module
P0726
Invalid signal received by microprocessor about engine speed
P0734
Wrong gear ratio in fourth speed
P0811
Error P0811 for severe slip of the clutch in the clutch system. A detailed diagnosis of all elements of the node, including disk integrity, is required.
P1031
The nominal value of the readings from the valve of the dampers located on the inlet channels is not reached
P1065
Error code P106500 indicates an incorrect fuel pressure control range
Video Guide: VW Error Code Diagnosis
Watch this comprehensive video guide on how to properly diagnose and interpret Volkswagen error codes using professional diagnostic equipment.
Frequently Asked Questions
How do I clear VW error codes after repairs?
After completing repairs, use an OBD-II scanner or VCDS tool to clear stored diagnostic trouble codes. Ensure all issues are properly addressed before clearing codes, as they may return if underlying problems persist.
Can I drive my VW with error codes present?
This depends on the specific code and severity. Critical codes affecting safety systems, emissions, or engine operation should be addressed immediately. Minor sensor codes may allow limited driving, but professional diagnosis is recommended.
What’s the difference between permanent and pending codes?
Permanent codes indicate confirmed faults that require repair and proper drive cycles to clear. Pending codes are potential issues that may become permanent if the condition persists through multiple drive cycles.
How often should I scan for VW error codes?
Regular scanning every 3-6 months or before major trips can help identify potential issues early. Immediate scanning is recommended when warning lights appear or performance issues develop.
Why do some VW error codes return after clearing?
Returning codes typically indicate the underlying problem wasn’t properly addressed. This could be due to intermittent faults, incomplete repairs, or related issues affecting the same system.
What tools do I need for VW-specific diagnostics?
While basic OBD-II scanners work for standard codes, VW-specific tools like VCDS (VAG-COM) provide access to manufacturer-specific codes, advanced diagnostics, and programming functions not available with generic scanners.
Professional VW Diagnostic Services
If you’re experiencing persistent error codes or need professional diagnosis, consider these services:
Engine Finder Professional Services
- VW Error Code Diagnosis: R450-R750
- Complete System Scan: R650-R950
- ECU Programming: R1,200-R2,500
- Electrical System Diagnosis: R500-R850
All diagnostic services include comprehensive reports and repair recommendations.
When to Seek Professional Help
- Multiple recurring error codes
- Codes affecting safety systems
- Intermittent faults difficult to reproduce
- ECU programming or calibration needs
- Warranty-related diagnostic requirements
Related Engine Problem Articles
Understanding VW error codes is just the beginning. For comprehensive engine problem diagnosis, explore these related resources:
- BMW Engine Error Codes and Common Problems - Compare diagnostic approaches across German manufacturers
- Engine Compression Problems Guide - Learn about compression-related error codes
- Cooling System Problems - Address cooling system error codes and overheating issues
- Ford Error Codes Problems - Diagnostic techniques for American vehicles
References and Sources
- Volkswagen Technical Service Information
- VCDS/VAG-COM Diagnostic Documentation
- OBD-II Standard Diagnostic Trouble Code Database
- Volkswagen Group Repair Manual Technical Guidelines
- Professional Automotive Diagnostic Equipment Manuals
P1114
The appearance of code 1114 indicates increased internal resistance of the second probe installed in the first row
P1127
Re-enrichment of the mixture in the first row of cylinders. Under the load of the power unit, its adaptation does not pass.
P1136
On the Passat B5 2008 and other models, this code indicates the depletion of the combustible mixture in the first row of engine cylinders. The specific number must be verified by the diagnostic method. The control unit indicates that this malfunction occurs when the engine is idling.
P1141
Invalid load accounting data
P1152
Overspill of the mixture in the first row of cylinders. The problem is related to problems with adaptation.
P1165
Error code 1165 appears as a result of re-enrichment of the mixture in the first row of cylinders
P1248
Incorrect control range in the injection timing control system
P1250
Fuel level too low
P1263
Invalid signal from second cylinder injector pump valve
P1273
Error code 1273 appears when you exit the control range of the signal coming from the valve of the pump injector of the fifth cylinder
P1296
Malfunction in the cooling system.
The reasons for this error can be many:
- breakdown of one of the antifreeze temperature sensors (disconnecting the connector, contact oxidation, wire damage);
- lack of refrigerant in the expansion tank;
- boiling antifreeze, leading to overheating of the power unit;
- lack of tightness associated with damage to the nozzles;
- errors in the functioning of the control unit;
- malfunction of the thermostat or its incorrect operation.
P1297
Pressure reduction in the pipeline between the turbocharged unit and the throttle body
P1403
On the Volkswagen Passat CC with a gasoline engine and other cars, this code indicates a violation of the control range in the exhaust gas recirculation system.
P1423
The throughput in the secondary air supply system is too low, fixed in the first row of cylindersP1479Error code P1479 indicates a mechanical malfunction in the brake booster vacuum system.
P1545
Throttle Control System Failure
P1553
The literal translation of the error is “the wrong ratio of the height and pressure controller signals in the intake manifold”. With this problem, engine malfunctions may occur.
P1562
The error is literally translated as “fuel pump dispenser-N146: upper limit”P1582Upper limit of adaptation in idle control system reached
P1570
The combination P1570 can literally be deciphered as “blocking the engine control unit”. Most likely, the cause of the problem is associated with a regular immobilizer.
Possible malfunctions:
- breakdown of the control module by the motor blocker;
- damage to the immobilizer antenna;
- chip malfunction;
- damage to the wiring, oxidation of the contacts on the connector;
- the use of auto-start alarms, which led to a conflict between the standard immobilizer and the additional one.
P1601
Invalid signal from terminal 30-J317 power relay
P1649
Error code P1649 indicates the absence of messages from the control module of the anti-lock system. The cause of the problem may be the data bus. It is required to check the loop on the ABS control unit (ABS) and the microprocessor module.
P1951
The second fan of the V177 cooling system is blocked or its operation is difficult. The cause of the problem may be the poor contact of the device with the on-board network, as well as damage to the wiring. Sometimes a malfunction consists in oxidizing the contacts on the connector.
P2002
Error code 2002 appears as a result of a malfunction of the particulate filter mounted on the first row of cylinders. The device must be replaced since it is not practical to clean it.
P2015
Error code P2015 (2015) indicates a malfunction in the intake manifold flaps.P2096The combination indicates an excess of the depletion limit of the air-fuel mixture. The problem, most likely, is the oxygen controller installed after the catalyst in the front row.
P2097
Oxygen controller mixture enrichment control limit exceeded. It is necessary to check the sensor installed in the first row after the catalyst.
P2101
Throttle Malfunctions
P2150
Injector Power (s) B: Short to Ground
P2177
Error code P2177 (2177) indicates a lean mixture in the first row of engine cylinders when it is idling
P2187
Lean mixture in the front row of the engine when idling
P2004
Error code P2004 (2004) reports that the intake flaps of the first row of cylinders do not close
P2179
The lean mixture in the cylinders of the power unit at speeds above idle
P2181
Error code 2181 indicates a malfunction in the cooling system. This is a common mistake, so the user needs to diagnose all components of the node.
P2192
On a car with a turbodiesel, this code often appears when enriching the air-fuel mixture. The control unit indicates that the problem may be a malfunction of the first oxygen controller installed in a row of 1 cylinders.
P2261
Mechanical damage to turbocharger bypass N249
P2262
No turbocharger pressure detected, mechanical failure
P2263
Turbocharger malfunction
P2279
Error code P2279 indicates a leak in the intake system. It is necessary to check all the lines, as well as their connection. Possible weakening of the clamps or damage to the nozzles.
P2463
Particulate filter problem. If error P2463 is most likely, the filter element will have to be changed.
P2637
Error code P2637 indicates an incorrect torque pulse of power unit
AP3014
Error code 3014 or 014 indicates a short to ground or damage to the wiring of the second boost pressure relief valve N274
P3078
The combination indicates problems in the operation of the throttle control unit. When the power unit is idling, the air supply to the cylinders is insufficient.
P3081
Error code 3081 on the Touareg 32 and other Volkswagen models indicates a low engine temperature. The causes of the malfunction can be many, but you need to start the diagnosis with the quality of antifreeze and the efficiency of the thermostat.
P3129
The basic settings of the mechanical stop of the inlet flaps in the closed position have been violated
P3139
Error code 3139 reports that the pulse from the intake flap is out of range
P3192
On Volkswagen T4, T5 and other versions of the data, the code indicates a malfunction of the intake flaps. The control unit calculated the violation of the basic parameters of the installation of the mechanical stop in the closed position.
How To Read VW Fault Error codes
Resources:
Important Disclaimer
This content is for informational purposes only and is based on research from automotive industry sources. Engine Finder is not a certified automotive repair facility. Always consult with qualified automotive professionals before performing any repairs or maintenance. Improper repairs can result in personal injury, property damage, or vehicle malfunction. We assume no responsibility for actions taken based on this information.