C0626

Code

Generic C — Chassis

Variable Effort Steering Sensor Circuit Low

Brand: Generic

Type: C — Chassis

Views: UK: 30 EN: 29 RU: 19

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Damaged or pinched wiring in the steering column harness
Connector corrosion, bent pins or poor mating at sensor or ECU connector
Short to ground on the sensor signal wire
Open circuit (broken wire) between sensor and control module
Failed variable-effort steering/torque sensor
Faulty sensor ground or reference voltage (low battery, bad ground, blown fuse)

Symptoms

EPS/steering system warning lamp illuminated
Reduced, increased, or inconsistent steering assist / abnormal steering effort
Stored/active DTC(s) and possible limp or reduced-assist mode
Intermittent loss of power assist that may change with steering input or engine load
Possible steering feel changes or noise from steering column

What to check

Retrieve freeze frame and live data with a scan tool; note conditions when code set
Visually inspect wiring and connectors at steering effort sensor and relevant control module for damage, corrosion, or loose pins
Check battery and charging system voltage; low system voltage can affect sensor references
Inspect fuses and relays related to EPS/steering circuits
Wiggle test harness while monitoring live data to reproduce the fault
Check for other related DTCs that may narrow scope (steering angle, CAN/U communication errors)

Signal parameters

Sensor reference voltage: typically a stable ~5.0 V reference (verify factory spec)
Signal voltage (no steering torque): usually near mid-scale (approx. 2–3 V) depending on sensor design
Low-fault condition: signal voltage significantly below expected range (often
Sensor ground: near 0 V with low resistance to chassis ground
Continuity: signal and ground wires should show low resistance to the ECU connectors (spec per factory)

Diagnostic algorithm

Connect a scan tool, record freeze frame/live data and clear the code; attempt to re-create the fault to confirm reproducibility.
Perform a visual inspection of sensor, connector, and harness through full steering sweep; repair any obvious damage.
Verify vehicle battery and charging system are within spec; ensure good battery terminals and chassis grounds.
Check fuses/relays for EPS or steering modules; replace if blown or suspect and re-test.
Backprobe sensor connector: with ignition ON, verify reference voltage present at sensor reference pin (≈5 V) and sensor ground continuity to chassis ground.
Measure sensor signal voltage while slowly turning steering and applying torque; note if signal is stuck low or drops to ground. If fluctuating with steering, capture waveform with scope.
If signal is low/0 V and reference is present, isolate by disconnecting sensor and checking resistance between signal wire and ground for short-to-ground. Repair short or open as needed.
Inspect and repair any damaged wiring — especially through the steering column where flexing occurs; replace harness sections if required.
If wiring and connectors test OK but signal remains out of range, replace the variable-effort steering sensor and re-test.
If new sensor still shows fault and wiring is verified, suspect control module input circuit fault; consult manufacturer procedures for module testing or replacement.
After repairs, clear codes and road-test to confirm the fault does not return and steering behavior is normal.

Likely causes

Short to ground or broken signal wire between sensor and ECU
Corroded/poor connector at the sensor or module
Failed steering effort/torque sensor
Bad sensor reference (5V) or ground
Loose or weak battery/vehicle ground affecting sensor reference

Fault status

⚠️ Status

Variable Effort Steering Sensor Circuit Low — sensor signal voltage below expected range. Check sensor, wiring, connectors, reference and ground for open or short conditions.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours