Power Steering Warning Light
Also called: EPS light, EPAS light, steering assist warning, power steering fault light, the "steering wheel with an exclamation point". Some vehicles display EPS, PWR STR, or a wrench beside a steering wheel.
- amber lamp
A steering wheel outline with an exclamation point beside or inside it. Some vehicles show a steering wheel above a wavy road, others just the letters EPS. A number of makes use amber for reduced assist and red for a total loss of assist, so the color on your dash carries meaning.
Find somewhere safe at low speed — an empty parking lot, a quiet street — and establish two things: whether you still have assist, and whether the wheel turns smoothly in both directions. Those answers change everything else. If steering feels normal, drive gently and book a diagnosis. If it has gone heavy but still moves smoothly, plan a short low-speed route, keep both hands on the wheel, leave extra room for every turn, and assume it can go fully heavy at any moment. If the wheel binds, catches, feels notchy, or is heavy in one direction only, do not drive it — call for a tow. Open the hood and check the serpentine belt and, on a hydraulic system, the power steering fluid level; a missing belt is a bigger emergency than the steering. Then have the battery and charging system load-tested before anyone touches the steering rack, because low voltage is one of the most common reasons an electric system drops assist and it is the cheapest thing on the list to rule out.
- Can I drive
- For short, low-speed trips with both hands on the wheel, generally yes — the car normally remains steerable, just much heavier. But this is not a light to sit on. Assist can disappear entirely and without warning, and the jump in effort mid-turn at parking speed on a heavy vehicle is enough to catch an experienced driver out. Skip highway trips, avoid tight maneuvers you cannot muscle through, and do not hand the car to a smaller or less confident driver until it is repaired. Do not drive it at all if the wheel binds, catches, or is heavy in only one direction — that pattern points at a seized motor or a damaged rack rather than lost assist, and it needs a tow. Same answer if the lamp is red on your vehicle, if the wheel has already gone fully heavy, or if the vehicle is steer-by-wire and has warned that it is in a backup mode: shop or tow, not the rest of your day. If it came on straight after repeated full-lock parking and normal feel returns after a rest, that is very likely thermal cutback — get it scanned, but it is not an emergency.
The power steering system has a fault and assist is reduced or switched off. On virtually all vehicles the steering stays mechanically connected — the wheel still turns the front wheels — but the effort required can rise dramatically, most of all at parking speeds. Two caveats matter. A seized assist motor, a binding column, or a damaged rack can make the wheel feel notchy, catchy, or heavy in one direction rather than merely stiff everywhere. And a small but growing number of steer-by-wire vehicles have no continuous mechanical link at all and depend on a backup mode instead. So: if the wheel still turns smoothly and is simply heavy, expect to steer as though the car has no power steering, and expect that change to arrive without warning. If it binds, catches, or is heavy in only one direction, stop and have it towed rather than driven.
Most modern vehicles use electric power steering: a motor on the column or the rack, a torque sensor measuring how hard you are pushing on the wheel, and a control module deciding how much help to add. Older and heavier vehicles use hydraulic assist — engine-driven pump, belt, fluid, hoses — and some use an electric pump driving a hydraulic rack. A small number of recent vehicles are steer-by-wire, with no direct mechanical connection between wheel and rack in normal operation. Electric systems reduce or cut assist deliberately when they cannot trust an input or cannot get enough electrical power. That is why this light so often reports a supply or signal problem rather than a broken steering component, and why the cheapest test — battery and charging system — should come first. Thermal cutback is designed behavior, not a fault in the usual sense. Repeated full-lock parking maneuvers, backing a trailer, or slow off-road crawling can overheat the assist motor; the system fades the assist out to protect itself, lights the lamp, and restores it once things cool. If your light appeared after ten minutes of shuffling in a tight parking lot and the steering feels normal again later, that is the likely story — still worth scanning, not worth panicking over. Assist is normally speed-dependent: a lot at parking speed, very little at highway speed. So a total loss of assist is far more noticeable pulling into a driveway than cruising on the highway. It is not harmless at speed, though — an emergency avoidance maneuver needs real force with no assist, and heavy vehicles are genuinely hard to turn. On hydraulic systems a dedicated warning light is less common. The tells are a whine that rises with engine speed, steering that goes heavy at idle and lightens as revs rise, and low fluid. A serpentine belt that has snapped or thrown takes your steering assist along with the alternator and, on many engines, the water pump — so heavy steering plus a battery light plus a rising temperature gauge is a stop-now situation for reasons that have nothing to do with steering.
Most power steering lamps do not flash; steady is the normal fault indication. Where flashing is used, it generally signals that the system is in a reduced-assist state or has not completed an initialization — a steering angle relearn outstanding after a battery disconnect or a repair, for example. The behavior is make-specific and there is no universal meaning. Treat a flashing lamp the same as a steady one: establish whether you still have assist and whether the wheel turns freely, then get the codes read.
- Low system voltage — a tired battery, corroded or oxidized terminals or ground, or a failing alternator. Electric assist motors draw serious current, and the module cuts assist and sets a fault rather than brown out. Test this first, every time.
- Torque sensor failure in the column or rack. The module cannot read how hard you are steering, so it refuses to assist. On most designs the sensor is not sold separately from the assembly.
- Steering angle sensor faulty or out of calibration, very often after an alignment, rack replacement, clock spring, or suspension work.
- Thermal protection after sustained heavy steering — assist fades, light comes on, and both return once the motor cools.
- Corroded or damaged connectors and wiring at the rack or column. Rack-mounted units sit low and take road salt, water and impact damage.
- Loss of communication on the vehicle network. Without a valid vehicle speed signal many systems fall back to a fixed or reduced assist level and light the lamp.
- Assist motor or control module failure, including brush and bearing wear in high-mileage column-mounted motors. A motor that has seized rather than merely quit shows up as binding or one-directional heaviness, not just lost assist.
- On hydraulic systems: low fluid from a leaking hose, rack seal or pump; a glazed, slipping or thrown serpentine belt; a failing pump; a restricted line; or fluid contaminated by the wrong type being added.
- Recent electrical work, a jump start done wrong, or an aftermarket install that disturbed a ground or shared a circuit it should not have.
A warning light reports that a module detected something. It does not identify which part is responsible — that takes reading the stored codes and testing.
Fix the cause, then clear the code with a scan tool that can reach the steering module; a basic OBD-II reader normally cannot. Many electric steering faults latch and will not clear themselves even after the condition is gone. A great many repairs — rack, column, angle sensor, and on some vehicles simply a battery replacement — require a steering angle calibration afterwards, and that procedure varies by manufacturer. Do not parts-swap this system. Start with a load test on the battery and a charging system test, then read the codes, then check the connectors and grounds at the rack or column. Nothing expensive gets ordered until a stored code plus a voltage test plus a connector inspection agree on the same component — torque sensors and modules are frequently replaced for what turns out to be a $30 problem. Rough US independent-shop costs: diagnosis $100-$200. Battery $150-$350. Serpentine belt $120-$300. Power steering hose $150-$500 and a hydraulic pump $300-$900 installed. Electric steering control module $400-$1,500 with programming. A column or rack assembly, which is where the torque sensor usually lives, $700-$2,500 and up, though remanufactured units often cut that substantially. Steering angle calibration $80-$200 if it is not already included in the repair.
The light tells you a system reported a fault. The stored code tells you what it measured. Look up your code — or if you have several, analyse them together.