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DTC codes / C07xx · Brakes, steering and suspension / C0720

C0720Electric Power Steering Torque Sensor Circuit

C0720 indicates that the electric power steering (EPS) control module has detected a fault in the torque sensor circuit, which measures how much steering effort the driver is applying. The computer monitors the sensor's signal voltage and compares it to expected values; when the signal falls outside the valid range or is inconsistent, it stores this code and typically disables power assist to prevent unexpected steering behavior.

SystemChassis
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaBrakes, steering and suspension

Symptoms you may notice

  • The power steering warning light or EPS symbol illuminates on the dashboard.
  • Steering effort increases noticeably, especially at low speeds or during parking maneuvers.
  • The steering may feel heavy or stiff, requiring more force to turn the wheel.
  • In some vehicles, the power assist may cut in and out intermittently before failing completely.
  • Often no symptoms besides the warning light, with steering feel unchanged in the early stages.

Common causes, most likely first

  1. A faulty steering torque sensor, which is the most common cause of this code.
  2. Damaged or corroded wiring in the torque sensor circuit, including open or short circuits.
  3. A poor electrical connection at the torque sensor connector or the EPS control module.
  4. Water or fluid intrusion into the torque sensor connector, leading to signal corruption.
  5. A failed EPS control module that cannot correctly process the sensor signal.
  6. Mechanical binding or damage in the steering column that affects sensor readings.
  7. Aftermarket accessories or improper electrical repairs that introduce interference on the sensor circuit.

How to diagnose and fix it

  1. Perform a visual inspection of the torque sensor and its wiring harness for obvious damage, corrosion, or loose connections.
  2. Use a scan tool to read the live data from the torque sensor and compare it to the manufacturer's specifications while turning the steering wheel.
  3. Check the sensor's reference voltage and ground circuits with a digital multimeter to rule out wiring faults.
  4. Inspect the connector pins for tightness and clean any corrosion or contamination.
  5. If the sensor signal is erratic or out of range, replace the torque sensor following the manufacturer's procedure.
  6. After replacement, clear the code and perform any required calibration or steering angle sensor reset with a scan tool.
  7. If the code persists, test the EPS control module and its power and ground connections, replacing it only if all other possibilities are eliminated.

Torque sensor faults often misdiagnosed

  • A low battery or charging system issue can cause the EPS module to set this code falsely, so always verify battery voltage and connections first.
  • The torque sensor is sometimes integrated into the steering column assembly, making replacement more involved than a simple sensor swap.
  • After replacing the torque sensor, many vehicles require a steering angle sensor calibration or a zero-point reset, which only a capable scan tool can perform.
  • This code can be set by a momentary glitch, so check for stored history codes and road-test the vehicle before condemning parts.
  • On some models, the same code appears if the steering column has been removed or replaced without proper initialization, even if the sensor is good.

Can I keep driving with C0720?

You can usually drive the vehicle with this code, but expect heavier steering, especially at low speeds, and be prepared for a sudden increase in effort. Avoid high-speed maneuvers or situations that require quick steering response, and have the fault diagnosed promptly to restore full power assist.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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