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2008 Volkswagen Jetta Problems

RepairPal has identified the most common problems with the 2008 Volkswagen Jetta based on complaints from actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.

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18
Known Problems

An ignition coil or spark plug may fail unexpectedly resulting in an engine misfire and possible illumination of the Check Engine Light. Vehicles equipped with spark plug wires may also develop a misfire caused by a failed spark plug wire.

Electrical issues that are difficult to diagnose—and sometimes intermittent—are typically due to ground wiring issues. The most troublesome ground locations are under the battery or at the engine.

Shifting issues due to internal problems in high mileage automatic transmissions can be difficult to resolve without transmission replacement.

Condensation in the heater case may cause a musty odor from the heating, ventilation and AC (HVAC) system after sitting for two hours or more. Our technicians tell us that a cleaner is available for the heater case and the drain system should be checked for debris.

Popping sounds from the rear of the vehicle may be heard moments after starting the engine, or when slowing to a stop. This noise is from the leak detection pump filling the fuel tank with air, and releasing to retest the system when it finds a fault. The sequence of faults identifying this issue are as follows:

  • Succession of loud pops from rear of vehicle
  • Pops go away, and fuel economy decreases 
  • Check engine light illuminates
  • OBD trouble code P2404 and/or P0441 is stored
  • Engine will not start after refueling (must crank for over 30 seconds)
  • Vibration when slowing to a stop

The cause is a valve which is mounted on the front of the intake manifold, commonly called the N80 valve, or EVAP system purge valve. The valve is designed to open under specific circumstances, but a worn valve will remain open at all times, preventing the pressurization of the fuel tank. 

Correction of the issue is to replace the N80 valve with the latest revision. 

Extensive transmission damage can occur in some of the automatic transmission models when the transmission oil cooler fails and allows coolant to mix with the automatic transmission fluid.

The 2006-2016 Jetta uses FSI and TSI direct injection engine. These engines are subject to carbon buildup in the intake system which can cause power loss, OBD codes and a check engine light, and a rough idle. In normal engines, the engine is cleaned by the gasoline flowing through the injectors and into the intake system, however, since the Jetta uses direct injection, gasoline does not flow through common carbon buildup areas. 

Possible trouble codes include: P0300P0301P0302P0303P0304.

The solution is to remove the intake manifold and professionally clean the intake manifold, intake ports on the cylinder head, and the intake valves. This may need to be done in as few as 20,000 miles. 

A damaged water pump impeller may cause an engine overheating condition. Our technicians tell us the repair should include replacement of the water pump, thermostat, and flushing the cooling system.

The water pump and/or other cooling system may develop a coolant leak. Oil leaking from the  valve cover gasket is also common.

The flywheel for the 2006-2008 Volkswagen Jetta with the 2.0L Turbo engine is a non-conventional "Dual Mass" flywheel. It is known to make light rattling noise when the engine is cold, and should subside once the engine temperature raises. If the rattle doesn't go away when the engine warms, the flywheel may have failed.

If the dual mass flywheel has failed, the only solution is to replace the flywheel.

Reverse gear failures and noise in the manual transmission models are common.

Drivers of the Volkswagen Jetta and GLI may experience a clunking noise associated with acceleration from a stop, or downshifting for hard acceleration. This will also be accompanied by a light impact sensation under the drivers feet. Drivers may also notice unexplained changes to their front end alignment while driving. 

This issue is commonly called " VW Subframe Clunk", and is caused by the gradual stretching of the bolts that secure the subframe to the vehicle. The subframe is a large plate that secures to the bottom of the engine bay, and connects the body of the car to the engine and suspension. Over time, the bolts that secure the subframe stretch, allowing the subframe to move and hit the bottom of the car when accelerating.

There are many aftermarket kits that can be installed to correct the issue, and Volkswagen has issued a correction including better bolts, and spacers which fit between the subframe and the car.

The driver door wiring loom cracks and degrades with time due to weathering and frequent opening and closing of the door. This problem affects the normal operation of all electronic components of the door including, but not limited to:

-Electric Windows

-Electric Door Locks

-Trunk Release

-Fuel Filler Door Release

-Speakers

-Interior Lights Stay On at All Times

-Keyless Locks

-Power Side Mirrors

-Alarm

The correction for this issue is to replace the driver side door wiring harness. For security purposes, the doors can be locked with the key. The interior lights should be shut of manually, and through the multi function display in the gauge cluster to prevent battery drain.

The 2006-2008 Volkswagen Jetta and Jetta GLI with the 2.0L Turbo FSI engine looses power if the turbocharging system has a leak. The most common turbo boost leak is a torn rubber diaphragm on the diverter valve, which is intended to open only if pressure gets too high. Common symptoms are increased turbo noise when letting off of the gas pedal, and power loss.

If there is a turbocharging system leak, the system will need to be inspected, and the defective seals and/or valve will require replacement.