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Home / DTC / P2106 — Throttle Actuator Control System - Limited Power

P2106 — Throttle Actuator Control System - Limited Power

Detailed page for trouble code P2106.

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P2106

LAND ROVER P — Powertrain

Throttle Actuator Control System - Limited Power

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 10 EN: 10 RU: 8
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Page language: EN

Causes

  • Faulty electronic throttle body (throttle actuator/motor or throttle position sensor)
  • Intermittent or shorted wiring/connectors between throttle body and PCM
  • Failed PCM/ECU or software issue
  • Faulty accelerator pedal position sensor or inconsistent pedal input
  • Low or intermittent battery voltage / poor charging system
  • Mechanical obstruction/sticking throttle plate or excessive carbon build-up

Symptoms

  • Vehicle enters limited power / limp mode with reduced acceleration
  • Engine runs but throttle response is poor or fixed at low RPM
  • Illuminated Check Engine Light and possibly a dash message: 'Reduced Engine Power'
  • Surging or hesitation when accelerating
  • Possible hard-start or failsafe idle

What to check

  • Read freeze frame and live data with a capable scan tool; note throttle angle, commanded angle, accelerator pedal voltages and battery voltage
  • Visually inspect throttle body connector and wiring for damage, corrosion, bent pins, or water ingress
  • Check battery voltage and charging system under load
  • Perform basic actuator self-test or throttle body motor test if supported by scanner
  • Inspect throttle plate for carbon build-up or mechanical binding
  • Check for related codes in accelerator pedal, CAN bus, or powertrain modules

Signal parameters

  • Accelerator pedal sensor: two channels typically 0.5–4.5 V; sensor 1 rises with pedal, sensor 2 often opposite or offset — both must correlate
  • Throttle position sensor (TPS) feedback: 0.5–4.5 V range, idle ~0.5–1.0 V, wide-open ~4.0–4.5 V (values vary by model)
  • Actuator supply: stable ~12 V supply and good ground expected when ignition on
  • Control signal from PCM: PWM or voltage commands; commanded vs actual throttle plate angle should track closely
  • Resistance/continuity: wiring harness continuity between throttle body and PCM; motor windings typically low ohms (refer to factory data)

Diagnostic algorithm

  1. Connect a full-function scan tool. Record stored and pending codes, freeze frame, and live data for accelerator pedal sensors, commanded throttle angle, and actual throttle angle.
  2. Visually inspect the throttle body, connector, and harness for damage, corrosion, pin push-out, or water intrusion. Repair any obvious damage.
  3. Check battery voltage at rest and while cranking; ensure charging system is healthy. Low system voltage can cause actuator faults.
  4. With ignition on (engine off), observe accelerator pedal sensor voltages and verify both channels move smoothly and correlate. Replace pedal sensor if inconsistent or out of range.
  5. Perform an actuator/throttle body self-test or command the throttle body using the scan tool. Verify the throttle plate moves to commanded positions and that feedback follows.
  6. If actuator fails movement or feedback is incorrect, check supply and ground at the throttle body connector. Confirm continuity back to the PCM and check for shorts to power/ground.
  7. Clean the throttle plate if binding or carbon is present, then retest. If mechanical binding persists, replace the throttle body.
  8. If wiring and throttle body test good, consider PCM malfunction or software. Verify latest software/calibration from dealer; perform throttle body and PCM relearn/adaptation procedures per factory instructions.
  9. After repairs, clear codes and perform a road test while monitoring live data to confirm the fault does not return.

Likely causes

  • Contaminated or sticking throttle plate preventing correct travel
  • Damaged/thin insulation or corrosion on throttle body harness or connector
  • Failed throttle actuator motor or internal gears
  • Incorrect or missing throttle body adaptation/relearn after replacement
  • Faulty accelerator pedal sensor producing inconsistent dual signal voltages
  • Intermittent 12V supply or ground to the throttle actuator

Fault status

⚠️ Status
Throttle Actuator Control System — Limited Power. ECU detected discrepancy or fault in electronic throttle control; entered reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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