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2004 Pontiac Grand Prix GTP Problems

RepairPal has identified the most common problems with the 2004 Pontiac Grand Prix GTP 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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14
Known Problems

The high pressure power steering hose will commonly leak fluid; it should be replaced.

The mass air flow or crankshaft position sensor may fail causing the engine to intermittently stall. It may be necessary for the engine to cool down before it will restart.

The steering may develop a clunk type noise from the upper intermediate steering shaft.  Our technicians tell us that you should check with your local GM dealer to find out what the latest repair is for this condition.

The supercharger may develop a noise in the front section of the supercharger assembly. The is due to a worn coupler. Our technicians tell us that a remanufactured coupler section is available from aftermarket suppliers.

The 2004-2005 Pontiac Grand Prix GTP is known to have issues with the EVAP system, a part of your emission control system.

The EVAP canister vent valve or valve solenoid wiring may fail causing illumination of the check engine light, setting code P0446, and problems filling the tank with fuel.

To correct the issue, the EVAP canister vent valve, solenoid, and wiring must be inspected. The most common fix is replacement of the wiring connector or replacement of the vent valve assembly.

The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Running the engine with a coolant/oil mix may result in engine damage. Replacing the intake manifold gasket should correct this issue.

You may be able to prevent transmission problems by servicing the transmission and inspecting the fluid every 30,000 miles. If the fluid is dark or burned then the transmission system should be completely flushed.

The fuel pump may fail causing engine to stall and not restart.

A Loose or worn gas cap may cause Check Engine Light to illuminate.

The serpentine belt tensioner pulley may wear out. Our technicians tell us that in order to get a new pulley from General Motors you must purchase a complete belt tensioner assembly.

The transmission pressure control solenoid may fail causing erratic shifting. Our technicians tell us that partial dis-assembly of the transmission is necessary to replace a failed pressure control solenoid.

The intake manifold gasket may develop external engine oil leak. The manifold gasket will need to be replaced to correct this issue. RepairPal cannot confirm a recall for this concern on these models.

Extended life coolant may become contaminated and require cooling system service before the recommended 100,000 miles.

Contaminated brake fluid can cause problems in the brake system and it should be flushed every 60,000 miles.