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Your 2004-2012 Malibu turns heavy in a parking lot, then feels normal again the next morning. Do not blame the pump or the rack first. This generation has no hydraulic pump at all.

Electric power steering means an electric motor helps you turn, instead of a belt-driven pump. One small part tells that motor how much help you need. It is the torque sensor, and it measures how hard you are twisting the wheel.

When the sensor drifts or drops out, the assist goes with it. The wheel then feels like the parking brake is on. That is the failure the 5S15931 / 23232310 torque sensor for the 2004-2012 Malibu fixes.

What a failing sensor feels like

The pattern is easy to recognize once you have seen it. Watch for these signs:

• Steering goes heavy at low speed, then normal again later.
• It is worst with the wheel cranked full lock in a parking lot.
• The wheel can feel stiffer turning one way than the other.
• A power steering warning may show on the dash, with C15xx codes stored — trouble codes the car saves when it spots a fault.
• Heat often sets it off: fine in the morning, heavy once the cabin warms up.

These symptoms come and go because the sensor is degrading, not dead. A clean on/off failure is rare on this part.

Rule out these two free checks first

Before you spend money, clear two look-alikes. Both take minutes.

• Low voltage. The EPS module (the small computer that runs the assist motor) stops helping below roughly 10 volts. Charge the battery and clean the grounds first.
• The clock spring. That is the coiled wire inside the column feeding the horn, wheel buttons, and airbag. If all three die together with an airbag light, it is the clock spring.

The split is simple. Wheel functions alive plus heavy steering points at the torque sensor. Wheel functions dead points at the clock spring, and a voltage fault clears once the electrics are fixed.

What the sensor actually does

The sensor is the part that decides when the motor helps you. Here is the whole loop:

• You turn the wheel, and a thin torsion bar inside the column twists a few degrees.
• The sensor reads that twist and reports a torque value.
• The module decides how much current the motor gets, and in which direction.
• Assist stays light at parking speed and firmer at highway speed.

One broken link in that loop breaks the whole assist. A drifting sensor gives you a lazy motor.

One sensor, two reference numbers

How to replace it, and the step you cannot skip

The sensor mounts on the steering column. Parts are the cheap half of this job; trim removal and the setup step are where the time goes.

1. Disconnect the battery.
2. Remove the lower column trim.
3. Unplug the sensor connector and unbolt it from the column housing.
4. Bolt in the new sensor and reconnect it.
5. Check that the front wheels point straight.
6. Run the centering step: teach the sensor where straight-ahead is, with a scan tool or the steering sequence in service information.
7. Road test.

Skipping the centering step has a precise symptom. The car pulls to one side, or the assist feels stronger turning one way than the other, because the sensor's zero point sits off center.

Same column, two different parts

The clock spring and the torque sensor share the column, so a function test picks the right part. Horn dead, buttons dark, airbag light on — that triad needs the 26092622 spiral cable clock spring for the 2004-2010 Malibu.

The seventh-generation Malibu (2008-2012) shares its column family with the Pontiac G6 and Saturn Aura. That is why the clock spring covering the 2008-2012 Malibu, 2005-2010 G6, and 2007-2009 Aura shows up in the same carts. Two different parts, two different symptom sets, one neighborhood.

The same rule runs through this platform's electronics: sensors feed decisions, and a wrong sensor produces a confident wrong decision. Owners converting older cars to electric assist are exploiting the same architecture shift, as in this electric power steering conversion write-up. Column parts for every variant of this platform live in the steering and suspension collection.

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