C0074

Code

Generic C — Chassis

Requested Driving Torque

Brand: Generic

Type: C — Chassis

Views: UK: 21 EN: 53 RU: 35

AI status

Completed

ready

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Page language: EN

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