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

P2106 — Throttle Actuator Control System - Forced Limited Power

Detailed page for trouble code P2106.

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P2106

Generic P — Powertrain

Throttle Actuator Control System - Forced Limited Power

Brand: Generic
Type: P — Powertrain
Views: UK: 40 EN: 97 RU: 41
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Throttle actuator (throttle body) failure or internal short
  • Wiring harness damage, open or short to power/ground in throttle motor or sensor circuits
  • Poor connector contact, corrosion or water intrusion at throttle/PCM connectors
  • Accelerator pedal position (APP) sensor fault or wiring issue
  • Low or unstable battery/charging system voltage
  • PCM/software fault, corrupted calibration, or communications error (CAN)

Symptoms

  • Reduced engine power / limited throttle response (limp mode)
  • Check Engine Light / MIL illuminated, possibly with P2106 and related codes
  • Vehicle won't accelerate beyond a reduced speed or rpm limit
  • Hesitation or lack of throttle response when accelerator pressed
  • Engine may run roughly under acceleration or refuse to respond to pedal input

What to check

  • Retrieve all stored and pending DTCs and freeze-frame data with a scan tool
  • Check vehicle battery and charging system voltage (key on, engine off and running)
  • Compare APP (accelerator pedal position) vs TPS (throttle position) live data for correlation
  • Use bi-directional scan tool to command throttle actuator and watch response
  • Visually inspect throttle body connector and wiring for damage, corrosion, or water intrusion
  • Inspect harness grounds near engine and PCM for security and cleanliness

Signal parameters

  • Battery voltage (key on engine off and running) — nominal 12.0–14.5 V
  • Accelerator pedal position (%) — should vary smoothly 0–100% with pedal travel
  • Throttle plate position / Throttle position sensor (TPS) (%) — should correlate with APP; no large lag or mismatch
  • Throttle actuator/drive motor current (A) — nominal depends on vehicle; abnormal high or low current indicates motor or short
  • Throttle motor duty cycle or command (%) from PCM — used during actuator tests
  • Engine RPM — used to observe limp mode behavior

Diagnostic algorithm

  1. Connect a professional scan tool; record P2106 and any related codes (e.g., APP, TPS, CAN faults) plus freeze-frame data.
  2. Verify battery and charging system voltage. Low voltage can cause actuator faults; repair charging/battery as needed.
  3. Inspect throttle body connector and wiring for damage, corrosion, or loose pins. Wiggle test while monitoring live data for intermittent faults.
  4. Compare APP vs TPS live values across pedal travel. If APP input is good but TPS doesn't follow, suspect throttle actuator or wiring to TPS.
  5. Use scan tool to perform an actuator/motor command test (if available) and observe throttle plate movement and motor current draw.
  6. Measure continuity and resistance of throttle motor and sensor circuits to PCM per manufacturer specs. Check for short to power/ground.
  7. Check engine grounds and harness in area for corrosion or high resistance.
  8. Clean throttle plate if mechanical sticking or heavy carbon is present, then re-test.
  9. If wiring and mechanical checks are good and actuator fails bench or scan-tool tests, replace throttle body assembly.
  10. After repair, clear codes and perform a relearn/adaptation procedure for throttle/APP per manufacturer. Re-check for stored codes and road-test to verify.
  11. If faults persist with correct hardware, consider PCM software update or PCM replacement as a last step, and re-check communications on CAN bus.

Likely causes

  • Shorted or high-resistance throttle motor winding
  • Broken or frayed wiring on throttle body harness
  • Contaminated or corroded connector pins at throttle body
  • Failed APP sensor producing implausible input vs TPS
  • Weak battery or poor ground causing actuator undervoltage
  • Throttle body carbon buildup preventing full travel

Fault status

⚠️ Status
PCM detected a throttle actuator control fault and has limited engine power (limp mode) to protect the drivetrain. Throttle response is reduced until the underlying fault is corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P2106

LAND ROVER P — Powertrain

Throttle Actuator Control System - Limited Power

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 30 EN: 63 RU: 32
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Throttle actuator (throttle body) failure or internal short
  • Wiring harness damage, open or short to power/ground in throttle motor or sensor circuits
  • Poor connector contact, corrosion or water intrusion at throttle/PCM connectors
  • Accelerator pedal position (APP) sensor fault or wiring issue
  • Low or unstable battery/charging system voltage
  • PCM/software fault, corrupted calibration, or communications error (CAN)

Symptoms

  • Reduced engine power / limited throttle response (limp mode)
  • Check Engine Light / MIL illuminated, possibly with P2106 and related codes
  • Vehicle won't accelerate beyond a reduced speed or rpm limit
  • Hesitation or lack of throttle response when accelerator pressed
  • Engine may run roughly under acceleration or refuse to respond to pedal input

What to check

  • Retrieve all stored and pending DTCs and freeze-frame data with a scan tool
  • Check vehicle battery and charging system voltage (key on, engine off and running)
  • Compare APP (accelerator pedal position) vs TPS (throttle position) live data for correlation
  • Use bi-directional scan tool to command throttle actuator and watch response
  • Visually inspect throttle body connector and wiring for damage, corrosion, or water intrusion
  • Inspect harness grounds near engine and PCM for security and cleanliness

Signal parameters

  • Battery voltage (key on engine off and running) — nominal 12.0–14.5 V
  • Accelerator pedal position (%) — should vary smoothly 0–100% with pedal travel
  • Throttle plate position / Throttle position sensor (TPS) (%) — should correlate with APP; no large lag or mismatch
  • Throttle actuator/drive motor current (A) — nominal depends on vehicle; abnormal high or low current indicates motor or short
  • Throttle motor duty cycle or command (%) from PCM — used during actuator tests
  • Engine RPM — used to observe limp mode behavior

Diagnostic algorithm

  1. Connect a professional scan tool; record P2106 and any related codes (e.g., APP, TPS, CAN faults) plus freeze-frame data.
  2. Verify battery and charging system voltage. Low voltage can cause actuator faults; repair charging/battery as needed.
  3. Inspect throttle body connector and wiring for damage, corrosion, or loose pins. Wiggle test while monitoring live data for intermittent faults.
  4. Compare APP vs TPS live values across pedal travel. If APP input is good but TPS doesn't follow, suspect throttle actuator or wiring to TPS.
  5. Use scan tool to perform an actuator/motor command test (if available) and observe throttle plate movement and motor current draw.
  6. Measure continuity and resistance of throttle motor and sensor circuits to PCM per manufacturer specs. Check for short to power/ground.
  7. Check engine grounds and harness in area for corrosion or high resistance.
  8. Clean throttle plate if mechanical sticking or heavy carbon is present, then re-test.
  9. If wiring and mechanical checks are good and actuator fails bench or scan-tool tests, replace throttle body assembly.
  10. After repair, clear codes and perform a relearn/adaptation procedure for throttle/APP per manufacturer. Re-check for stored codes and road-test to verify.
  11. If faults persist with correct hardware, consider PCM software update or PCM replacement as a last step, and re-check communications on CAN bus.

Likely causes

  • Shorted or high-resistance throttle motor winding
  • Broken or frayed wiring on throttle body harness
  • Contaminated or corroded connector pins at throttle body
  • Failed APP sensor producing implausible input vs TPS
  • Weak battery or poor ground causing actuator undervoltage
  • Throttle body carbon buildup preventing full travel

Fault status

⚠️ Status
PCM detected a throttle actuator control fault and has limited engine power (limp mode) to protect the drivetrain. Throttle response is reduced until the underlying fault is corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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P2100 P2101 P2102 P2103 P2104 P2105
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