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DTC codes / C06xx · Brakes, steering and suspension / C0626

C0626Variable Effort Steering Sensor Circuit Low

This code means the computer that controls the variable effort steering system has detected a low voltage signal on the sensor circuit that measures steering effort or steering wheel position. The system uses this sensor to adjust how much power assist you feel at the wheel, and a low signal tells the module that the circuit is shorted to ground or the sensor is not reporting correctly.

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

Symptoms you may notice

  • The steering feels heavier or lighter than usual, especially at low speeds or during parking maneuvers
  • The variable effort steering warning light or a generic stability control light illuminates on the dashboard
  • The steering assist may default to a fixed, heavier effort mode as a fail-safe
  • Often no symptoms besides the warning light, because the system reverts to a safe default
  • Intermittent changes in steering feel that come and go with bumps or temperature changes
  • A related stability control or power steering message may appear on the driver information center

Common causes, most likely first

  1. A damaged or chafed wire in the variable effort steering sensor circuit shorting to ground
  2. A faulty variable effort steering sensor or steering angle sensor internally shorted
  3. Corroded or loose electrical connector pins at the sensor or steering control module
  4. Water intrusion into the sensor connector or module causing a low-resistance path to ground
  5. A failed steering control module not supplying the correct reference voltage to the sensor
  6. Aftermarket accessories or poor previous repairs tapping into the sensor wiring
  7. A bad ground connection for the steering control module or sensor return circuit

How to diagnose and fix it

  1. Scan all modules for related codes and record freeze-frame data to see when the low voltage was detected
  2. Inspect the sensor connector and wiring harness for corrosion, chafing, or loose pins, and repair as needed
  3. Measure reference voltage and signal voltage at the sensor connector with the key on and compare to specifications
  4. Disconnect the sensor and check for a short to ground on the signal wire using a multimeter
  5. Check the steering control module ground and power feeds for voltage drops under load
  6. If the circuit tests good, substitute a known-good sensor and recheck live data to confirm the fault follows the sensor
  7. Clear codes and perform a steering angle or variable effort steering calibration if required by the manufacturer

What a low signal really tells you

  • A low signal code often comes from a shorted sensor rather than a failed steering rack, so test the circuit before condemning expensive mechanical parts
  • Water or road salt in the connector can pull the signal voltage low and set this code even when the sensor itself is healthy
  • Some vehicles set this code when battery voltage is low during cranking, so check the battery and charging system first
  • The variable effort steering sensor is sometimes shared with the steering angle sensor, and a fault in that shared circuit can set this code without any steering feel change
  • A previous repair that spliced into the sensor wiring for an aftermarket accessory is a common hidden cause of a low signal

Can I keep driving with C0626?

You can usually drive the vehicle because the system defaults to a fixed assist level, but expect heavier steering at low speeds and reduced stability control performance. Avoid aggressive maneuvers and have the circuit inspected soon, especially if the steering feel changes suddenly.

Tools that help

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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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