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Home / DTC / C2502 — Electric Power Steering Torque Sensor Circuit Fault

C2502 — Electric Power Steering Torque Sensor Circuit Fault

Detailed page for trouble code C2502.

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C2502

Generic C — Chassis

Electric Power Steering Torque Sensor Circuit Fault

Brand: Generic
Type: C — Chassis
Views: UK: 2 EN: 3 RU: 1
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Page language: EN

Causes

  • Open or shorted wiring between torque sensor and EPS module
  • Corroded, loose, or damaged connector pins at the steering column or EPS module
  • Failed torque sensor inside steering column (internal electronics)
  • Poor or missing reference voltage or ground to the sensor
  • Water intrusion or contamination in steering column harness or connector
  • Faulty EPS control module or internal input circuit

Symptoms

  • EPS warning light or steering fault message illuminated
  • Sudden loss or reduction of power assist (heavy steering) or intermittent assist
  • Steering may feel jerky, noisy, or erratic at low speeds
  • Vehicle may enter reduced-assist or limp mode for steering safety
  • Related stability/ABS or CAN network warnings/messages in some vehicles
  • DTC C2502 stored with freeze-frame or live data showing bad sensor values

What to check

  • Scan for C2502 and any other related codes (EPS, CAN bus, ABS) and record freeze frame/live data
  • Check battery voltage and charging system; low voltage can cause sensor anomalies
  • Visually inspect steering column harness, connectors, and protective boots for damage or water
  • Check fuses/relays for EPS power circuits
  • Backprobe torque sensor connector with ignition on and measure reference voltage and ground
  • Wiggle the column harness/connectors while watching live data to reproduce intermittent faults

Signal parameters

  • Reference (sensor supply) voltage typically ~5.0 V (verify vehicle-specific value)
  • Sensor outputs (redundant channels A/B) typically centered near mid-supply (~2.5 V) at zero torque and vary ~0.5–4.5 V across full torque range — verify with OEM spec
  • Both sensor channels should be present, similar, and correlate; difference greater than specified (usually >0.5–1.0 V) indicates fault
  • Output update rate/refresh: tens to a few hundred Hz (check live-data sampling)
  • Expect low leakage to ground; open circuit or short-to-power/ground will be out of range
  • Continuity between sensor connector and EPS module pins should be near zero ohms (vehicle-specific)

Diagnostic algorithm

  1. Retrieve and record all codes and freeze-frame data. Note operating conditions when fault occurred.
  2. Verify battery voltage ≥12.6 V (engine off) and charging system healthy; repeat test with stable supply.
  3. Perform a visual inspection of column harness, boots, connectors and EPS module connectors for damage, corrosion, or water intrusion.
  4. Check EPS-related fuses and relays; repair if blown or intermittent.
  5. With ignition ON (engine off for safety), backprobe sensor connector: verify reference voltage and ground at connector per vehicle spec.
  6. Measure both torque-sensor signal channels at the connector with steering centered. Expect near-mid-supply voltages and correlated change when gently turning wheel. Record values.
  7. Wiggle the harness and connectors while watching live values; note intermittent changes. Check for short-to-power or short-to-ground with multimeter (pin-to-pin and pin-to-chassis).
  8. If open/short suspected, disconnect connectors and perform continuity/resistance checks to EPS module pins; repair any damaged wiring, replace harness sections, or repair terminals.
  9. If wiring and connectors test good but signals are out-of-range or channels disagree, consider replacing torque sensor assembly (may require steering column removal) and perform required calibration/initialization after replacement.
  10. If replacement and wiring checks fail to clear the issue, evaluate EPS control module input circuits and CAN communication; consider module replacement only after eliminating harness/sensor faults.
  11. Clear codes and road-test to verify repair. If intermittent, perform extended test drive to confirm durability.
  12. Safety note: procedures may require steering wheel/airbag removal and SRS disabling — follow OEM safety/service procedures.

Likely causes

  • Broken or chafed harness where it flexes at the column
  • Connector pin pushed out, bent, or corroded at column or module
  • Short to chassis ground or to battery voltage on one of the signal wires
  • Torque sensor internal failure (Hall effect or magnetoresistive element)
  • Loose or corroded ground at chassis or EPS module mounting point
  • Aftermarket steering-wheel work (airbag/controls) disturbed sensor connector

Fault status

⚠️ Status
EPS torque sensor circuit fault detected — sensor signal invalid or out of range; EPS may enter reduced-assist (limp) mode.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1-4 hours

Similar codes

C2500 C2501 C2503 C2570 U0121 U0140
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