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Home / DTC / C105B — Actuator Circuit - Group B

C105B — Actuator Circuit - Group B

Detailed page for trouble code C105B.

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Code

C105B

LAND ROVER C — Chassis

Actuator Circuit - Group B

Brand: LAND ROVER
Type: C — Chassis
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Page language: EN

Causes

  • Open or short in the actuator wiring harness (Group B)
  • Corroded, bent or loose connector pins at the actuator or module
  • Failed actuator (motor, solenoid or position sensor)
  • Blown fuse or faulty relay supplying the actuator circuit
  • Poor chassis or module ground
  • Control module (ECU) output driver fault or internal failure

Symptoms

  • Related system warning lamp illuminated (ABS/ESC/traction/other module message depending on vehicle)
  • Loss or reduction of the affected function (e.g., valve not operating, motor not moving, diminished control)
  • Humming, clicking or no noise from actuator when system commands movement
  • Intermittent operation or fault returns after clearing codes
  • Possible limp/limited functionality message

What to check

  • Read freeze-frame and full fault list with a capable scan tool; note any related DTCs or communication faults
  • Visually inspect actuator and wiring harness for damage, corrosion, pinch points and water entry
  • Check relevant fuses and relays for proper condition and operation
  • Verify proper battery voltage at the actuator power feed connector with key on (typically ~12 V)
  • Check ground continuity from actuator ground pin to chassis (near 0 ohms)
  • Measure actuator resistance and compare to service manual specification

Signal parameters

  • Supply voltage to actuator: ~11–14 V with ignition ON (vehicle battery voltage)
  • Control signal: may be switched +12 V or PWM; expected duty cycle varies by command — refer to factory data
  • Ground resistance: near 0 Ω between actuator ground and chassis (typically
  • Actuator coil/motor resistance: typically low ohms to low hundreds of ohms depending on actuator type — compare to factory spec
  • Typical current draw: small solenoids 0.1–2 A, motors may draw higher under stall conditions — use service values

Diagnostic algorithm

  1. Confirm C105B is current and note any other stored codes and freeze-frame data.
  2. Consult the manufacturer service manual for Group B actuator circuit schematic, pinouts and specific voltage/resistance specs.
  3. Perform a thorough visual inspection of the actuator, connector and harness routing; repair any physical damage.
  4. Check fuses/relays and replace if faulty.
  5. Disconnect the actuator connector and inspect pins for corrosion, bending or pushed-out terminals; repair as needed.
  6. With connector disconnected, measure supply voltage and ground at the harness connector with ignition ON to verify power/ground presence.
  7. Measure actuator resistance at the connector; compare to factory specification. If out of range, bench-test or replace the actuator.
  8. Back-probe the control pin while commanding the actuator with a scan tool; observe signal type (on/off or PWM), amplitude and duty cycle. Compare to expected values.
  9. If wiring power/ground and signals are correct but actuator does not operate, replace actuator and retest.
  10. If actuator and wiring check good but the control signal is absent or incorrect, suspect module driver fault — verify module grounds and communications, consider reprogramming or module replacement only after wiring and actuator confirmed good.
  11. Clear codes and perform a functional test/road test to confirm repair; monitor for recurrence.

Likely causes

  • Connector corrosion or pin damage at the actuator harness
  • Broken wire or chafed insulation near suspension, door or engine bay areas
  • Actuator internal failure (stalled motor or shorted coil)
  • Blown fuse or weak relay feeding the actuator
  • Ground strap loose or corroded at chassis or module

Fault status

⚠️ Status
Actuator Circuit — Group B: control module has detected abnormal electrical characteristics (open/short/high resistance or driver fault) in Group B actuator circuit. Inspect wiring, connectors, actuator and module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

C105A C105C C1100 U0121 U0100
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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