Tag Archives: power steering trouble

Honda and Toyota dominate the EPS column-sensor world, and when their electric steering starts acting up, a scan tool test is the fastest way to isolate the problem. Unlike hydraulic systems, where a pressure gauge tells the story, EPS faults live in the sensor data and the communication between the torque sensor, the angle sensor, and the assist motor.

Towing a trailer adds hydraulic load that a steering system was never really sized for, and a stiff wheel only when towing is a common complaint on pickup trucks. The pump has to push a heavier front end through slow, tight turns at the boat ramp or campground, and if the pump is worn, the lines are restricted, or the gearbox is worn, the extra load exposes it.

A sweet, burnt-oil smell drifting through the vents is one of those problems owners often blame on the heater core first, but on many trucks and SUVs the real culprit is power steering fluid finding a path into the cabin air stream. The steering column seal on a Chevrolet Silverado or GMC Sierra sits close enough to the firewall that a weep from the shaft can feed droplets onto the carpet-side insulation, and the blower then does the rest.

The power steering pressure switch screws into the high-pressure line near the pump, and it is one of the smallest leak points on the entire system. On a Ford F-150 or Chevrolet Silverado, the switch sits in a wet, salty corner of the engine bay, and over the years the O-ring beneath it hardens while the fitting threads corrode. Owners often mistake the weep for a pump shaft seal because the fluid runs down the same bracket and looks identical at a glance.

A high-mileage power steering pump rarely leaks everywhere at once. The seals give way in a predictable order because each one sits in a different heat and pressure zone, and once you learn the sequence you can tell which seal is weeping just by where the wetness lands. On trucks of any age, the pump shaft seal is usually the first to fail, followed by the reservoir O-ring and finally the outlet fitting.

A leak that appears only after the truck sits overnight, yet vanishes during a drive, usually points to the reservoir height and the return line rather than a high-pressure seal. On a Chevrolet Tahoe or Ford Explorer, the reservoir sits higher than the rack, and a loose return fitting can siphon fluid downhill only when the pump is off and gravity takes over.

Hydroboost brake boosters on trucks like the Ram 1500 and Chevrolet Silverado borrow hydraulic pressure from the power steering pump instead of using engine vacuum, which means a failed booster seal can push brake fluid backward into the steering system, or vice versa. Finding pinkish brake fluid mixed with the clear power steering fluid points straight at the booster seal.

On cold mornings, the first few turns of the wheel feel like wrestling a heavy door, then everything loosens up within a block or two. This is one of the most common cold-weather steering complaints, and it almost always traces back to thick fluid, a low reservoir, or a pump that cannot build pressure until the oil warms. It is rarely a worn rack at this stage, because wear does not magically cure itself after five minutes of driving.

When the EPS light comes on and the wheel suddenly feels like a hydraulic system lost its belt, the problem is almost always in the electric assist path rather than a fluid leak. EPS systems have no fluid, no pump, and no belt, so a heavy wheel plus a warning light points straight at the torque sensor, the column-mounted motor, or a communication fault between them. The good news is that most EPS faults are readable with a scan tool, which narrows the repair before any parts are ordered.