2006 Pontiac G6 Steering Torque Sensor Replacement
On a 2006 Pontiac G6, the steering torque sensor is part of the column-mounted electric power steering (EPS) system. It measures how hard and in which direction you turn the wheel so the power steering control module can command the assist motor. When it fails, steering can feel heavy, uneven or erratic, and a power steering warning may appear. This guide explains how to confirm the diagnosis, what the replacement involves and how to verify the repair. It does not replace GM service information.
Confirm the part and repair scope
The G6 does not use a hydraulic power steering pump. Assist comes from an electric motor on the steering column, and the torque sensor and control module work alongside it. Typical torque sensor symptoms include assist that is stronger in one direction than the other, a wheel that feels notchy or wants to self-steer, intermittent loss of assist, and a stored chassis code for the torque sensor circuit or signal. Read codes with a scan tool that can access the power steering control module, because a generic engine-only code reader will not see them. Check battery condition, charging voltage, the EPS fuse and the ground connections first. Low system voltage can mimic a sensor fault.
Rule out problems a new sensor will not fix. A clunk or knock felt through the wheel at low speed on this platform is often traced to the intermediate shaft. Worn tie rod ends, ball joints or loose mounting points cause wander and noise rather than assist faults. Check joint play in the intermediate shaft and front steering components before buying parts. In factory service information, the torque sensor is generally serviced as part of the steering column or power steering motor assembly rather than as a separate sensor. Match any replacement column or kit to your VIN and options, and confirm whether it includes the control module. Before paying for parts, have the VIN checked for open recalls or special coverage on the power steering system, since some GM vehicles of this era received EPS-related campaigns.
Prepare tools and safe access
This is mostly an interior job. The car stays on its wheels on a level surface with the parking brake set, so you do not need to lift it to work on the column. If you also inspect front suspension and steering joints, use proper vehicle support. Raise the car only at the lift points specified for the G6, and place it on rated stands, never on a jack alone. You will need the GM service manual or an equivalent model-specific repair database for the removal steps and every fastener specification. You will also need a torque wrench, trim tools, the sockets and drivers the column and steering wheel fasteners require, and a scan tool capable of power steering module setup and calibration.
The steering wheel carries the driver airbag, and the column holds the airbag clockspring. Follow the service manual procedure to disable the airbag system. That includes disconnecting the battery and waiting the specified time before touching any airbag connector. Leave this repair to a shop if you have not worked around airbags or lack a scan tool that can complete the post-installation setup. An incorrectly calibrated EPS system can steer unpredictably.
Remove without avoidable damage
Center the steering wheel with the front wheels pointing straight ahead. Lock or tape it so the column cannot rotate once the intermediate shaft is disconnected, because turning the column with the shaft free can damage the clockspring. With the airbag system disabled, remove the airbag module, column covers, lower trim and, where the procedure calls for it, the steering wheel. Mark the intermediate shaft position on the column shaft before removing its pinch bolt so it goes back on the same spline.
Unplug the column electrical connectors, including the torque sensor, motor and control module harnesses. Release each connector lock rather than pulling on the wires. Support the column before removing its mounting fasteners. The assist motor makes it heavier than a conventional column, and if it drops it can damage the sensor or connectors. Do not separate the torque sensor from the motor housing or column unless the service information for your part explicitly allows it. The sensor is matched to the input shaft, and taking a working assembly apart on the bench can leave it uncalibrated or damaged. Keep the old fasteners together, and check which ones the manual lists as single-use so you can replace them.
Install and restore the system
Transfer only the parts the replacement assembly lacks, such as the clockspring or switches, keeping the clockspring centered. Lift the new column into position and start all mounting fasteners by hand. Tighten them in the sequence and to the fastener specification given in the service manual. Reconnect the intermediate shaft on the marked spline with the wheels straight, fit a new pinch bolt if required and tighten it to specification. Push every connector in until its lock seats, and route the harnesses away from moving parts and sharp edges.
Reinstall the trim, steering wheel and airbag module. Then reconnect the battery and re-enable the airbag system exactly as the manual describes. Most replacement EPS columns and control modules need scan-tool setup before they work correctly. Depending on what was replaced, GM service information may call for programming the power steering control module, selecting the correct steering calibration for the vehicle, and calibrating the steering position or torque sensor center. Perform these steps with the wheels straight and the vehicle stationary. Clear stored codes only after setup has completed.
Check the completed work
Confirm the airbag warning lamp goes out after the bulb check and no power steering message remains. Rescan the power steering and airbag modules for codes. With the engine running and the car stationary, turn the wheel lock to lock. Assist should feel even in both directions, with no binding, notches or self-steer. Then road test at low and moderate speeds. Check that the wheel returns toward center, effort stays consistent, and the steering wheel is centered when driving straight.
An off-center steering wheel after column work usually means the intermediate shaft went back on one spline off, so correct it at the shaft before considering other adjustments. If the car pulls or the tires wear unevenly, have a wheel alignment checked with the vehicle at its normal ride height. Further diagnosis is needed before regular driving if any of these appear: codes that return, uneven assist, intermittent loss of assist or new noises. Likely causes include an incomplete setup step, a connector or ground problem, low voltage or a defective replacement part.