Symptoms of Bad Electric Power Steering: What 2,946 Reports Show

Electric power steering (EPS) replaces the old hydraulic pump with an electric motor — on the column or the rack — controlled by a module that reads a torque sensor and adds assist as you turn. There is no fluid, no belt and no pump. When it fails, it fails like electronics, not like plumbing, and the complaint file draws that line clearly. We pulled the federal data, took the 2,946 reports that name electric power steering against 16,077 other steering complaints, and its symptoms are unmistakably its own.

The warning light is the signature

The single most distinctive symptom is a warning light or dashboard message — 36.5% of EPS reports against 15.9% of the control, more than twice as often. An EPS system watches itself: when the module detects a fault in the motor, the torque sensor, the wiring, or its own electronics, it lights a steering warning (often a wheel-and-exclamation symbol or a “service power steering” message) and frequently reduces or cuts the assist to a safe state. That light is the earliest and clearest sign, and unlike the hydraulic system’s whine, it is a specific, logged event rather than a noise you have to interpret.

Then the assist cuts out

The consequence is the second symptom: hard, heavy steering or lost assist, in 25.1% of reports against 13.2% of the control. When the module drops the assist, the steering does not fail — you can still turn the wheel — but it suddenly takes far more effort, because you are now moving the rack by hand. It is manageable at speed, where less assist is needed, and hardest at parking speed, where a sudden loss can catch a driver off guard. The tow that appears in 11.4% (against 7.8%) is often a driver who stopped rather than fight the wheel. Because the failure is electronic, it can also be intermittent — the assist returning after a restart — which is itself a warning not to ignore.

What it is not: a worn-joint feel

The telling detail is what runs below the control. A vibration or shimmy appears in just 2% of EPS reports against 6.2% of the rest of the steering system, and wandering or pulling in 3.4% against 7.6%. Those are the symptoms of worn mechanical parts — a column, a tie rod, a rack — and their scarcity in EPS reports confirms this is a different kind of failure: a module, a motor or a sensor, diagnosed by a scan tool reading the codes, not by feeling for play.

What to do when you suspect it

Treat a steering warning light, or a sudden change in steering effort, as a reason to have the system scanned promptly — EPS faults store codes that point straight at the cause, whether it is the torque sensor, the motor, the module or a wiring or connector fault. Some are fixed with a software update or a connector repair; others need the motor or module replaced. Because EPS has drawn a number of recalls for sudden assist loss, checking the specific model and year for an open recall comes first — a recalled fix is free, and this is exactly the kind of fault that gets one. Do not keep driving a car whose assist cuts out intermittently without having it diagnosed.

On a used car you are about to buy

EPS trouble is easy to check if you know what to look for. On the test drive, watch the dashboard at start-up for a steering warning light that stays on, and feel for steering that is heavier than expected or that changes effort unexpectedly. Make several full-lock turns at parking speed, where lost assist shows most. Before you buy, check the model and year in the complaint lookup and its recalls, since sudden loss of EPS assist has been the subject of several campaigns and a seller will not raise one.

Common questions

What are the symptoms of bad electric power steering?

A steering or EPS warning light is the signature (36.5% of reports against 15.9% of other steering complaints, more than twice as often), followed by hard or heavy steering as the assist cuts out (25.1% against 13.2%). Mechanical symptoms like vibration and wandering are actually rarer than in the rest of the steering system, because EPS fails as electronics — a module, motor or sensor — not as a worn joint.

Why did my steering suddenly get hard while driving?

In a car with electric power steering, a sudden increase in steering effort usually means the system has cut the assist after detecting a fault, almost always lighting a warning at the same time. The steering still works — you are now turning the rack without help — but it takes much more effort, especially at low speed. Have it scanned promptly, and check for a recall, since sudden assist loss has drawn several.

Is it safe to drive with the EPS light on?

Cautiously and briefly, to get it diagnosed. The steering does not fail outright — you can still steer — but the assist may be reduced or may cut out entirely and without much warning, which is most dangerous at parking speed. Because the fault is logged and sometimes intermittent, do not treat a returning assist as fixed. Scan the codes and check for an open recall before relying on the car.

How is this different from a power-steering pump?

A hydraulic power-steering pump whines and leaks fluid; electric power steering has no pump, fluid or belt, so it does neither. Its signature is a warning light and a sudden change in assist. If there is no power-steering reservoir under the hood and the warning is a dashboard light rather than a noise, the system is electric and the fault is electronic.