2007 Pontiac G6

The electric power steering motor fails without warning, causing a sudden loss of power assist and making the steering wheel very difficult to turn. The 'Power Steering' warning light illuminates on the dash. This is one of the most commonly reported safety complaints on the G6, with thousands of NHTSA complaints filed. The failure is especially dangerous during parking, turning, and low-speed maneuvers.

Replace the electric power steering motor and/or the EPS control module. GM issued multiple TSBs addressing EPS failures on the Epsilon platform (TSB 09-02-35-001). The motor is located on the steering column. Ensure the replacement module is programmed with the latest calibration. Check the wiring harness connector for heat damage.

Certain G6 models are affected by the GM-wide ignition switch defect where the switch can rotate out of the 'Run' position while driving, shutting off the engine and disabling power steering, power brakes, and airbag deployment. The defect was linked to numerous injuries and fatalities across the GM small car lineup.

NHTSA Recall 14V400000 and 14V047000. GM replaced the ignition switch and reprogrammed the airbag sensing diagnostic module on affected vehicles free of charge. Contact a GM dealer to verify the recall has been completed on your specific VIN.

The intake manifold gaskets on the 3.5L and 3.9L V6 engines deteriorate and leak coolant internally (into the combustion chambers) or externally. Internal leaks cause white exhaust smoke, coolant consumption, and overheating. External leaks cause coolant pooling on top of the engine and a sweet coolant smell. The plastic intake manifold can also warp, preventing a proper gasket seal.

Replace the intake manifold gaskets with the updated Felpro or GM gasket set. Inspect the intake manifold for warping and replace if necessary. Flush the cooling system and refill with Dex-Cool. If coolant has entered the combustion chambers, inspect for cylinder wash and potential head gasket damage.

The 4T45-E four-speed automatic transmission develops harsh and erratic shifting, particularly a hard 1-2 shift and delayed engagement from Park. The transmission pressure control solenoid and valve body accumulate varnish and debris, causing inconsistent hydraulic pressure. Some owners report the transmission failing to shift out of first gear (limp mode).

A transmission fluid flush and filter change may improve shift quality in early stages. If shifting is still harsh, the valve body may need replacement or remanufacturing. Replace the pressure control solenoid and internal wiring harness. Severe cases with clutch damage require a complete transmission rebuild or replacement.

On G6 convertible models, the retractable hardtop system develops hydraulic pump failures, cylinder leaks, and motor burnout. The top may stop mid-cycle, fail to latch properly, or leak water into the cabin when closed. The hydraulic fluid reservoirs leak and the system loses pressure, preventing the top from operating. This was a complex system prone to multiple failure modes.

Check the hydraulic fluid level and top off with the correct fluid. If the hydraulic pump motor has failed, replace it. Leaking hydraulic cylinders must be replaced individually. Inspect the trunk latch microswitches, as a faulty switch can prevent the system from initiating. Reference GM TSB for convertible top diagnostic flow chart.