OBD-II trouble code
C0545: Steering Wheel Torque Sensor Circuit
The power steering control module detected a fault in the steering torque (effort) sensor circuit. This sensor tells the system how hard you are turning the wheel, so a fault usually reduces or disables power assist.
Quick facts
- System
- Chassis
- Category
- Steering / Electric Power Steering
- Severity
- High severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $100 – $1,500
- DIY difficulty
- Advanced DIY
What does C0545 mean?
C0545 sets when the Power Steering Control Module (PSCM) detects a problem with the steering wheel torque sensor circuit. The torque sensor — sometimes called the steering effort or torsion sensor — measures how much twisting force the driver applies to the steering wheel. It is the primary input an electric power steering (EPS) system uses to decide how much assist to add. If the module cannot trust that signal, it cannot safely provide proportional assist, so it typically reduces or shuts off power steering and sets a warning.
The torque sensor is usually built into the steering column or the EPS assembly, mounted on a small torsion bar between the upper and lower shaft. As you turn the wheel, the torsion bar twists slightly, and the sensor converts that twist into an electrical signal. Because it is fundamental to how assist is calculated, a torque sensor fault is generally treated as a high-priority steering condition even though the vehicle stays mechanically steerable.
As with other EPS faults, do not jump straight to the sensor. Wiring, connectors, and low system voltage can all disturb the torque signal. On many vehicles the torque sensor is not serviced individually and comes only as part of the steering column or EPS unit, so accurate diagnosis matters before committing to a large part. Some platforms also require a torque-sensor learn or calibration procedure after any related repair.
C-code meanings vary by manufacturer, so confirm your specific make and model's definition for C0545. On many GM applications it is grouped with C0176, C0475, and C0476 as part of a broader EPS diagnosis.
Common causes
- Faulty steering wheel torque (effort) sensor, often integral to the steering column or EPS assembly
- Open, shorted, or chafed wiring in the torque sensor circuit
- Corroded or loose connector at the sensor or control module
- Low battery or charging-system voltage disturbing the sensor reference
- Torque sensor calibration/learn not performed after a prior repair
- A failed power steering control module
Symptoms
- Loss or reduction of power steering assist — the wheel feels heavy
- Power Steering / Service Steering message and warning light
- Steering assist that behaves erratically or inconsistently
- Stability or traction warnings may also appear
- Assist that does not correctly match steering effort
Diagnostic steps
- 1.Scan for all codes and note any accompanying EPS codes (C0176, C0475, C0476) or voltage/charging faults, and address those first.
- 2.Load-test the battery and confirm charging-system output before considering parts.
- 3.Inspect the torque sensor connector and wiring for corrosion, chafing, and pushed-out terminals.
- 4.Follow the manufacturer's pinpoint test to check the torque sensor circuit and reference/signal voltages.
- 5.Check whether a prior steering or module repair left the torque sensor without a required calibration/learn.
- 6.Replace the torque sensor or EPS/column assembly only after wiring, connectors, voltage, and calibration are ruled out, then perform any required relearn.
Repair cost
$100 – $1,500
A wiring, connector, or calibration fix can run $100-$400. Because the torque sensor is frequently sold only as part of the steering column or EPS assembly, a sensor-driven repair commonly runs $500-$1,500 in parts and labor. Some vehicles also require a post-repair calibration that must be done with a capable scan tool.
Estimate your repair
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Open the Repair Cost Estimator with electric power steering service preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an advanced DIY job. It typically requires specialty tools, scan-tool access, lifting equipment, or careful sequencing to avoid causing new failures. Plan for extended downtime and have a backup vehicle. Most owners are better served by a shop that has done this repair before.