Code
C104F
LAND ROVER
C — Chassis
Torque actuator system control Sensor power supply voltage Control valve of security
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EN: 4
RU: 0
AI status
Completed
Completed
100%
Causes
- Blown fuse or tripped circuit protecting the actuator/sensor supply
- Low battery or poor battery connections causing undervoltage
- Corroded, damaged or loose connector at actuator, sensor or control valve
- Open, shorted or high-resistance wiring between ECU and actuator/sensor
- Internal failure of torque actuator, control valve or sensor
- Faulty control module (transfer case module / ABS/traction module)
Symptoms
- Traction control, ESP/ABS or AWD warning lamp illuminated
- Reduced traction or inability to transfer torque to wheels (limited functionality or limp mode)
- Clicking or unusual noise from actuator or transfer case area
- Intermittent or permanent loss of actuator response
- Stored DTCs related to torque transfer, transfer case or ABS modules
What to check
- Read all stored and pending codes from ABS, drivetrain and transfer-case modules; note freeze-frame/live data
- Check battery voltage at rest and while cranking (should be >12.2 V at rest, >10 V while cranking generally)
- Inspect fuses and fusible links for the actuator and control modules
- Visually inspect connectors and wiring to actuator/control valve for corrosion, damage, or water entry
- Wiggle test wiring/connectors while monitoring live data to reproduce the fault
- Measure supply and ground continuity to the actuator/sensor connector
Signal parameters
- Reference/supply voltage to sensor/actuator: typically battery voltage (~11–14.5 V) or a regulated 12 V source depending on model
- Logic/reference signal (if present): typically 5 V reference for sensors; confirm with factory data
- Sensor/actuator signal range: expected sensor output commonly 0.1–4.9 V (model dependent)
- Actuator coil/solenoid resistance: nominal values vary by model — typical range 5–60 Ω; compare to manufacturer spec
- PWM drive frequency for control valve (if driven by PWM): often in the 20–200 Hz range — confirm with service data
- CAN/vehicle bus: communication presence and fault-free messages to relevant module(s)
Diagnostic algorithm
- Record all DTCs and freeze-frame data from all related modules (ABS, traction, transfer case, engine). Clear codes and attempt to re-scan to confirm repeatability.
- Verify battery condition and proper system voltage. Charge or replace battery if low and retest.
- Inspect and test fuses and relays for the actuator/valve supply. Replace any faulty devices.
- Perform a thorough visual inspection of wiring harnesses and connectors at the torque actuator, control valve and associated modules. Look for corrosion, bent pins, water ingress, crushed or chafed cables.
- With ignition ON, backprobe the actuator/sensor connector and measure supply voltage and ground reference. Compare readings to expected values. Check for intermittent drops while wiggling the harness.
- Measure sensor signal and/or actuator coil resistance with ignition OFF and compare to OEM specifications. If out of range, suspect component or wiring short.
- Check for proper CAN/communication messages to the module controlling the actuator using a diagnostic tool. Address any communication errors first.
- If wiring and supply/grounds are correct, perform module/component bench or substitution tests per service manual (e.g., swap known-good actuator or use manufacturer-approved test harness).
- Check for available software updates or technical service bulletins affecting torque actuator calibration or control logic.
- Replace only the failed component (actuator, valve, sensor or module) after confirming wiring and supply integrity. After repair, perform any required relearn/calibration procedures and verify with road test and re-scan.
Likely causes
- Corroded connector or poor ground at actuator/sensor
- Blown fuse or intermittent supply from battery
- Damaged wiring harness (chafing, rodent damage)
- Failed torque actuator or control valve solenoid
- Module internal fault (less common) or missing/incorrect software
Fault status
Status
Sensor power supply voltage fault — torque actuator control valve (security) detected. Electrical supply or sensor out of range.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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