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Steering that feels heavier than it should on the way down I-65, a whining noise every time you turn into a parking spot in Antioch, or a warning light on the dash you haven’t seen before all mean something in the power steering system needs attention. Which one it is matters for how urgent the timing is.
Most current Nissan models use electric power steering, which works completely differently from the hydraulic systems in older vehicles. The symptoms are different, the service needs are different, and what causes problems in each system is different. Knowing which one you have is the right starting point.
The service team at Downtown Nashville Nissan can diagnose and repair both systems. Schedule online or give us a call if the steering doesn’t feel right.
Most current Nissan models use electric power steering, or EPS. This includes the Rogue, Altima, Sentra, Kicks, Leaf, Frontier, and Pathfinder. EPS uses an electric motor mounted on the steering rack or column to assist the driver. There’s no fluid, no pump driven by the engine, and no hoses that can leak. The system runs off sensors and the car’s electrical system.
Older Nissan models used hydraulic power steering, which relies on a belt-driven pump, power steering fluid, and a network of hoses to generate assist. Some transitional models used an electro-hydraulic system, where an electric motor drives the hydraulic pump instead of the engine belt. The quickest way to tell which system you have: look under the hood for a power steering fluid reservoir. If there isn’t one, your Nissan uses EPS.
The distinction matters because the two systems fail in completely different ways, need different service, and respond to different symptoms.
Some symptoms point clearly to one system or the other. Others can show up in both. Here’s how to read them.
Stop-and-go traffic on I-65, Gallatin Pike, and Dickerson Pike puts steady low-speed load on the power steering system. At low speeds, both hydraulic and electric systems are working hardest. Hydraulic pumps are under more strain. EPS motors are putting out more assist. The difference is noticeable in a commute with a lot of stops.
Nashville’s summer heat affects both systems. For hydraulic setups, heat accelerates fluid breakdown over time, and a system running hot and low on fluid degrades faster. For EPS, heat stresses the 12V battery, which the electric motor depends on completely. A battery that’s marginal can trigger EPS faults and warning lights under thermal load, often before the battery shows obvious problems during a regular start.
Tight parking maneuvers and full-lock turns, common in Nashville’s older neighborhoods like Germantown or in parking structures near downtown, put the most stress on both systems. Holding the wheel at full lock for more than a few seconds strains the hydraulic pump and forces the EPS motor to work at maximum output. Both systems tolerate this occasionally but not as a habit.
For hydraulic systems, service starts with checking the fluid level and condition. Healthy power steering fluid is clear or slightly amber. Dark, contaminated, or foamy fluid needs to be flushed and replaced. The technician will also inspect hoses and connections for leaks and check the condition of the drive belt and pump. A pump that’s starting to fail often makes noise before it stops working altogether, which is the better time to catch it.
For EPS systems, there’s no fluid to check. Service starts with a scan of the EPS control module for stored fault codes, followed by voltage testing to confirm the electrical system is delivering steady power to the motor. Battery and charging system health is checked as part of EPS diagnosis, since a weak battery is one of the most common causes of EPS faults on current Nissan models. If sensor calibration is needed after any steering or suspension work, that gets done before the vehicle goes back on the road.
Both systems get a test drive as part of service to confirm the steering is responding correctly before the vehicle leaves the shop.
If the steering warning light comes on and the wheel feels normal, schedule a diagnostic visit within the next day or two. If the light comes on and the steering is already stiff or heavy, don’t wait. Get it looked at the same day if you can.
Any whining noise when turning that you haven’t heard before is a sign the hydraulic system needs a look. Don’t ignore it hoping it clears up. It won’t, and a pump that’s making noise is a pump that’s heading toward failure.
If you drive a current Nissan with EPS and you’ve had any suspension work done recently, or if you’ve hit a pothole or curb hard enough to bend a wheel or shift the alignment, have the EPS system checked. Hard impacts can damage the steering rack or the EPS motor even when there are no obvious warning lights yet.
The service team at Downtown Nashville Nissan handles power steering diagnosis and repair for Nashville drivers and surrounding communities including Brentwood, Murfreesboro, Hendersonville, and Gallatin. Schedule online or call the service department directly.
