Code
C0074
Generic
C — Chassis
Requested Driving Torque
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between torque sensor, steering/steer assist ECU, and vehicle network
- Corroded or loose connector at torque sensor or steering ECU
- Failed steering torque sensor (torque sensor or torque sensor electronics)
- Faulty electric power steering (EPS) or steering control module
- Intermittent or lost CAN/communication bus messages (bus errors, high bit error rate)
- Low or unstable vehicle battery/charging voltage affecting sensors or module operation
Symptoms
- EPS or steering warning lamp illuminated
- Reduced or lost power steering assist (heavier steering)
- Intermittent or inconsistent steering effort or sudden changes in steering feel
- Vehicle may enter limp or degraded steering assist mode
- Related communication or steering-related diagnostic trouble codes stored
- Possible steering torque/value live-data shows implausible or out-of-range values
What to check
- Scan for active and historic DTCs; record freeze frame and related data
- Check for additional U- and C-codes indicating communication bus problems
- Visually inspect wiring and connectors to steering column torque sensor and steering ECU for corrosion, damage, or loose pins
- Verify battery voltage and charging system health (low voltage can cause sensor/module faults)
- Use a scan tool to view live data: requested driving torque, actual measured torque, steering angle, and module status
- Check CAN bus health: look for bus-off conditions, error counters, or excessive error frames
Signal parameters
- Requested Driving Torque typically transmitted as a module message on vehicle network (CAN) — parameter usually in Nm (example range approx. -100 to +100 Nm for steering torque; exact range and scaling manufacturer-specific)
- Message update rate commonly 10–100 Hz (depends on manufacturer); loss-of-message or extended latency can set a fault
- Torque sensor raw outputs may be analog voltages or dual-redundant sensors centered near mid-supply (example: 0–5.0 V with ~2.5 V center) — check manufacturer data for exact thresholds
- Watch for implausible values (stuck, constant, or rapidly oscillating values) or mismatch between requested torque and actual torque values
Diagnostic algorithm
- Connect a suitable scan tool and read all modules. Save code details, freeze frame, and live data for requested and actual torque.
- Clear C0074 and related codes, then cycle ignition and retest to see if code returns immediately or intermittently.
- Verify vehicle battery voltage with ignition on and during cranking; repair charging/battery faults before further testing.
- Visually inspect wiring, connectors, and grounds for the torque sensor and steering ECU. Repair any damage, corrosion, or loose pins.
- With scan tool monitoring live data, operate steering while observing requested driving torque and actual torque values. Note any implausible or missing values.
- If the torque sensor provides analog outputs, measure sensor supply, ground, and signal voltages with a multimeter or oscilloscope while turning the steering. Compare to manufacturer specs.
- Check CAN bus integrity: measure bus voltages, scan for U-codes (lost communication), and inspect for bus-off or high error counts. Repair wiring/terminations as needed.
- If wiring and communications are good but signals are implausible or absent, follow module/component isolation: swap or bench-test the torque sensor if serviceable, or replace the steering/EPS control module per manufacturer procedures.
- After replacement or repair, perform any required steering/torque sensor calibration, ECU reprogramming, or relearn procedures. Clear codes and road-test to confirm.
- If the code persists despite correct wiring and module replacement, involve manufacturer technical support for module-specific diagnostics and software updates.
Likely causes
- Damaged wiring or connector at the torque sensor or steering ECU
- Faulty steering torque sensor
- EPS/steering control module failure or internal error
- CAN/communication fault between modules
- Missing/incorrect sensor calibration or software update required
Fault status
Status
Requested Driving Torque: the system detected a missing, invalid, or inconsistent requested torque signal or communication error between steering/drive control modules. Check wiring, sensors, module communication, and calibration.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
C0074
HYUNDAI
C — Chassis
Requested Driving Torque (Subfault)
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between torque sensor, steering/steer assist ECU, and vehicle network
- Corroded or loose connector at torque sensor or steering ECU
- Failed steering torque sensor (torque sensor or torque sensor electronics)
- Faulty electric power steering (EPS) or steering control module
- Intermittent or lost CAN/communication bus messages (bus errors, high bit error rate)
- Low or unstable vehicle battery/charging voltage affecting sensors or module operation
Symptoms
- EPS or steering warning lamp illuminated
- Reduced or lost power steering assist (heavier steering)
- Intermittent or inconsistent steering effort or sudden changes in steering feel
- Vehicle may enter limp or degraded steering assist mode
- Related communication or steering-related diagnostic trouble codes stored
- Possible steering torque/value live-data shows implausible or out-of-range values
What to check
- Scan for active and historic DTCs; record freeze frame and related data
- Check for additional U- and C-codes indicating communication bus problems
- Visually inspect wiring and connectors to steering column torque sensor and steering ECU for corrosion, damage, or loose pins
- Verify battery voltage and charging system health (low voltage can cause sensor/module faults)
- Use a scan tool to view live data: requested driving torque, actual measured torque, steering angle, and module status
- Check CAN bus health: look for bus-off conditions, error counters, or excessive error frames
Signal parameters
- Requested Driving Torque typically transmitted as a module message on vehicle network (CAN) — parameter usually in Nm (example range approx. -100 to +100 Nm for steering torque; exact range and scaling manufacturer-specific)
- Message update rate commonly 10–100 Hz (depends on manufacturer); loss-of-message or extended latency can set a fault
- Torque sensor raw outputs may be analog voltages or dual-redundant sensors centered near mid-supply (example: 0–5.0 V with ~2.5 V center) — check manufacturer data for exact thresholds
- Watch for implausible values (stuck, constant, or rapidly oscillating values) or mismatch between requested torque and actual torque values
Diagnostic algorithm
- Connect a suitable scan tool and read all modules. Save code details, freeze frame, and live data for requested and actual torque.
- Clear C0074 and related codes, then cycle ignition and retest to see if code returns immediately or intermittently.
- Verify vehicle battery voltage with ignition on and during cranking; repair charging/battery faults before further testing.
- Visually inspect wiring, connectors, and grounds for the torque sensor and steering ECU. Repair any damage, corrosion, or loose pins.
- With scan tool monitoring live data, operate steering while observing requested driving torque and actual torque values. Note any implausible or missing values.
- If the torque sensor provides analog outputs, measure sensor supply, ground, and signal voltages with a multimeter or oscilloscope while turning the steering. Compare to manufacturer specs.
- Check CAN bus integrity: measure bus voltages, scan for U-codes (lost communication), and inspect for bus-off or high error counts. Repair wiring/terminations as needed.
- If wiring and communications are good but signals are implausible or absent, follow module/component isolation: swap or bench-test the torque sensor if serviceable, or replace the steering/EPS control module per manufacturer procedures.
- After replacement or repair, perform any required steering/torque sensor calibration, ECU reprogramming, or relearn procedures. Clear codes and road-test to confirm.
- If the code persists despite correct wiring and module replacement, involve manufacturer technical support for module-specific diagnostics and software updates.
Likely causes
- Damaged wiring or connector at the torque sensor or steering ECU
- Faulty steering torque sensor
- EPS/steering control module failure or internal error
- CAN/communication fault between modules
- Missing/incorrect sensor calibration or software update required
Fault status
Status
Requested Driving Torque: the system detected a missing, invalid, or inconsistent requested torque signal or communication error between steering/drive control modules. Check wiring, sensors, module communication, and calibration.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
371
Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HYUNDAI
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