In most Impalas, the power steering fluid type depends on the steering system: hydraulic PS uses Dexron ATF, while electric power steering does not use PS fluid.
Is your Impala hydraulic or electric?
Older Impalas used hydraulic power steering with a fluid reservoir and belt-driven pump. Newer models generally use electric power steering, which eliminates the separate power steering fluid reservoir altogether. The exact setup depends on the model year and trim.
How to tell which system you have
Check under the hood for a power steering fluid reservoir and a belt-driven pump. If you see a reservoir labeled Power Steering Fluid and hoses connected to a pump, you likely have hydraulic PS. If there is no PS fluid reservoir and you rely on an electric motor for steering assist, you have EPS.
- Look for a hydraulic power steering pump driven by the serpentine belt and a reservoir labeled Power Steering Fluid.
- If there is no reservoir or belt-driven pump and the steering uses sensors and an electric motor, you have EPS.
- For the exact specification, refer to your owner's manual or contact a Chevrolet dealer with your VIN.
Conclusion: Identifying whether your Impala uses hydraulic or electric power steering is essential before selecting fluids or performing maintenance.
Hydraulic power steering: Fluid options
If your Impala uses hydraulic power steering, you’ll typically use an ATF that meets Dexron specifications. Dexron VI is widely recommended and backward compatible with older Dexron II/III systems, but some very old GM components were specified for Dexron III only. When in doubt, consult the manual or the dealership.
Before listing the options, note that hydraulic PS fluids are designed to work with the steering pump, rack, and seals. Using the wrong fluid or mixing types can cause noise, reduced steering feel, or damage over time.
- Dexron VI ATF (preferred for most GM hydraulic PS systems)
- Dexron III ATF (older systems or if Dexron VI is not available)
- GM-approved power steering fluid (a Dexron-based fluid labeled for GM P/S use)
Always avoid engine oil, brake fluid, or other non-ATF fluids in a hydraulic PS system. If you’re unsure, have a professional confirm the correct fluid type for your exact model/year.
Electric power steering: Fluid-free system
The latest Chevrolet Impala models primarily use electric power steering (EPS). In EPS systems there is no dedicated power steering fluid reservoir to fill or check. If you experience steering problems, diagnosis typically involves the electrical system and steering sensors, and should be performed by a dealer or qualified technician.
Maintenance and quick checks
For hydraulic PS systems, regular monitoring helps prevent issues. Always use the correct Dexron-based ATF, avoid mixing fluids, and watch for leaks around hoses, the rack, and the pump.
- Check the power steering fluid level when the engine is cool and follow the dipstick or reservoir markings.
- Use only a Dexron-based ATF recommended by GM; do not mix different types.
- Inspect for leaks around hoses, the pump, and the rack; address a leak promptly to avoid damage.
In EPS-equipped Impalas, there is no PS fluid to maintain, but you should still watch for warning lights or abnormal steering feel, which can indicate electrical or sensor issues needing dealer service.
Summary
The Chevy Impala’s fluid requirements depend on the steering system. If you have hydraulic power steering, use a Dexron-based ATF (Dexron VI is the modern, widely recommended choice; Dexron III is acceptable for older systems). If your model uses electric power steering, there is no PS fluid to add. Always verify the exact specification in the owner's manual or with a Chevrolet dealer for your specific year and VIN.