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Home / DTC / P2102 — Throttle Actuator A Control Motor Circuit Low

P2102 — Throttle Actuator A Control Motor Circuit Low

Detailed page for trouble code P2102.

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59brands
11,914generic
22,491specific
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Code

P2102

Generic P — Powertrain

Throttle Actuator A Control Motor Circuit Low

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short to ground in throttle actuator (motor) control circuit
  • Corroded, loose or damaged connector at throttle body
  • Failed throttle actuator (motor) or internal throttle body electronics
  • Blown fuse or poor power supply to throttle module
  • Poor engine ground near throttle body or battery
  • ECM/PCM output driver fault

Symptoms

  • Check Engine MIL illuminated
  • Reduced engine power / limp mode
  • Poor or delayed throttle response and acceleration
  • Engine may stall or idle irregularly
  • Throttle pedal input has little or no effect

What to check

  • Read freeze frame data and related DTCs with a scan tool
  • Visually inspect throttle body connector, wiring, and engine grounds
  • Verify battery voltage and charging system operation
  • Check fuses and power supply circuits to the throttle module
  • Backprobe throttle actuator motor pins and measure voltage while commanding throttle with scan tool
  • Measure resistance/continuity of motor windings and check for shorts to ground

Signal parameters

  • Expected: Motor control circuit should switch between ~0V and near battery (approx. 11–14V) or a PWM signal when commanded; a steady low (
  • Motor coil resistance (typical): low ohms range — continuity expected (manufacturer spec varies; commonly a few ohms)
  • No continuity to ground on control signal pins (should be isolated except when driven)
  • Current draw increases when motor is commanded; excessive current may indicate motor stall or short
  • When idle/no-command, some control pins may be near 0V; when commanded, voltage/PWM duty should change

Diagnostic algorithm

  1. Retrieve all stored codes and freeze-frame data; note ignition state and engine conditions.
  2. Visually inspect throttle body connector, wiring harness, and related grounds for damage, corrosion, or loose pins.
  3. Verify battery voltage (key ON, engine OFF) is within normal range (≈12.0–12.8 V). Check charging system under load if needed.
  4. Check relevant fuses/relays for the throttle actuator/ECM power feed and replace if blown.
  5. Backprobe the throttle actuator motor connector. With key ON, measure reference and control voltages to identify permanently low lines.
  6. Use a scan tool to command the throttle actuator while observing voltages/waveforms at the motor connector. Look for expected switching or PWM activity when commanded.
  7. Measure motor winding resistance and check for short to ground/short between coils. Replace throttle body if motor windings are open/shorted or out of spec.
  8. Wiggle test harness while monitoring the circuit for intermittent drops; repair broken wiring or terminals as required.
  9. If wiring and motor check good, test ECM output driver by checking for correct commanded signals; if ECM output is absent despite correct commands and wiring, consider ECM fault.
  10. After repairs, clear codes, perform relearn or throttle adaptation procedure if required by manufacturer, then road test to confirm resolution.
  11. If problem is intermittent and not reproduced, consider extended road test or monitoring with data logger.

Likely causes

  • Damaged wiring harness or pin(s) at the throttle body connector
  • Corroded/contaminated connector or terminals
  • Failed throttle actuator motor or internal control module
  • Blown fuse or weak battery/low system voltage
  • Faulty ECM output stage (less common)

Fault status

⚠️ Status
Throttle Actuator A control motor circuit low — control circuit voltage below expected threshold. May cause reduced engine power and trigger limp mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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Code

P2102

LAND ROVER P — Powertrain

Throttle actuator control motor - low circuit

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short to ground in throttle actuator (motor) control circuit
  • Corroded, loose or damaged connector at throttle body
  • Failed throttle actuator (motor) or internal throttle body electronics
  • Blown fuse or poor power supply to throttle module
  • Poor engine ground near throttle body or battery
  • ECM/PCM output driver fault

Symptoms

  • Check Engine MIL illuminated
  • Reduced engine power / limp mode
  • Poor or delayed throttle response and acceleration
  • Engine may stall or idle irregularly
  • Throttle pedal input has little or no effect

What to check

  • Read freeze frame data and related DTCs with a scan tool
  • Visually inspect throttle body connector, wiring, and engine grounds
  • Verify battery voltage and charging system operation
  • Check fuses and power supply circuits to the throttle module
  • Backprobe throttle actuator motor pins and measure voltage while commanding throttle with scan tool
  • Measure resistance/continuity of motor windings and check for shorts to ground

Signal parameters

  • Expected: Motor control circuit should switch between ~0V and near battery (approx. 11–14V) or a PWM signal when commanded; a steady low (
  • Motor coil resistance (typical): low ohms range — continuity expected (manufacturer spec varies; commonly a few ohms)
  • No continuity to ground on control signal pins (should be isolated except when driven)
  • Current draw increases when motor is commanded; excessive current may indicate motor stall or short
  • When idle/no-command, some control pins may be near 0V; when commanded, voltage/PWM duty should change

Diagnostic algorithm

  1. Retrieve all stored codes and freeze-frame data; note ignition state and engine conditions.
  2. Visually inspect throttle body connector, wiring harness, and related grounds for damage, corrosion, or loose pins.
  3. Verify battery voltage (key ON, engine OFF) is within normal range (≈12.0–12.8 V). Check charging system under load if needed.
  4. Check relevant fuses/relays for the throttle actuator/ECM power feed and replace if blown.
  5. Backprobe the throttle actuator motor connector. With key ON, measure reference and control voltages to identify permanently low lines.
  6. Use a scan tool to command the throttle actuator while observing voltages/waveforms at the motor connector. Look for expected switching or PWM activity when commanded.
  7. Measure motor winding resistance and check for short to ground/short between coils. Replace throttle body if motor windings are open/shorted or out of spec.
  8. Wiggle test harness while monitoring the circuit for intermittent drops; repair broken wiring or terminals as required.
  9. If wiring and motor check good, test ECM output driver by checking for correct commanded signals; if ECM output is absent despite correct commands and wiring, consider ECM fault.
  10. After repairs, clear codes, perform relearn or throttle adaptation procedure if required by manufacturer, then road test to confirm resolution.
  11. If problem is intermittent and not reproduced, consider extended road test or monitoring with data logger.

Likely causes

  • Damaged wiring harness or pin(s) at the throttle body connector
  • Corroded/contaminated connector or terminals
  • Failed throttle actuator motor or internal control module
  • Blown fuse or weak battery/low system voltage
  • Faulty ECM output stage (less common)

Fault status

⚠️ Status
Throttle Actuator A control motor circuit low — control circuit voltage below expected threshold. May cause reduced engine power and trigger limp mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P2100 P2101 P2103 P2111 P2112 P2135
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

P2102

MITSUBISHI P — Powertrain

ETV motor circuit(shorted low)

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short to ground in throttle actuator (motor) control circuit
  • Corroded, loose or damaged connector at throttle body
  • Failed throttle actuator (motor) or internal throttle body electronics
  • Blown fuse or poor power supply to throttle module
  • Poor engine ground near throttle body or battery
  • ECM/PCM output driver fault

Symptoms

  • Check Engine MIL illuminated
  • Reduced engine power / limp mode
  • Poor or delayed throttle response and acceleration
  • Engine may stall or idle irregularly
  • Throttle pedal input has little or no effect

What to check

  • Read freeze frame data and related DTCs with a scan tool
  • Visually inspect throttle body connector, wiring, and engine grounds
  • Verify battery voltage and charging system operation
  • Check fuses and power supply circuits to the throttle module
  • Backprobe throttle actuator motor pins and measure voltage while commanding throttle with scan tool
  • Measure resistance/continuity of motor windings and check for shorts to ground

Signal parameters

  • Expected: Motor control circuit should switch between ~0V and near battery (approx. 11–14V) or a PWM signal when commanded; a steady low (
  • Motor coil resistance (typical): low ohms range — continuity expected (manufacturer spec varies; commonly a few ohms)
  • No continuity to ground on control signal pins (should be isolated except when driven)
  • Current draw increases when motor is commanded; excessive current may indicate motor stall or short
  • When idle/no-command, some control pins may be near 0V; when commanded, voltage/PWM duty should change

Diagnostic algorithm

  1. Retrieve all stored codes and freeze-frame data; note ignition state and engine conditions.
  2. Visually inspect throttle body connector, wiring harness, and related grounds for damage, corrosion, or loose pins.
  3. Verify battery voltage (key ON, engine OFF) is within normal range (≈12.0–12.8 V). Check charging system under load if needed.
  4. Check relevant fuses/relays for the throttle actuator/ECM power feed and replace if blown.
  5. Backprobe the throttle actuator motor connector. With key ON, measure reference and control voltages to identify permanently low lines.
  6. Use a scan tool to command the throttle actuator while observing voltages/waveforms at the motor connector. Look for expected switching or PWM activity when commanded.
  7. Measure motor winding resistance and check for short to ground/short between coils. Replace throttle body if motor windings are open/shorted or out of spec.
  8. Wiggle test harness while monitoring the circuit for intermittent drops; repair broken wiring or terminals as required.
  9. If wiring and motor check good, test ECM output driver by checking for correct commanded signals; if ECM output is absent despite correct commands and wiring, consider ECM fault.
  10. After repairs, clear codes, perform relearn or throttle adaptation procedure if required by manufacturer, then road test to confirm resolution.
  11. If problem is intermittent and not reproduced, consider extended road test or monitoring with data logger.

Likely causes

  • Damaged wiring harness or pin(s) at the throttle body connector
  • Corroded/contaminated connector or terminals
  • Failed throttle actuator motor or internal control module
  • Blown fuse or weak battery/low system voltage
  • Faulty ECM output stage (less common)

Fault status

⚠️ Status
Throttle Actuator A control motor circuit low — control circuit voltage below expected threshold. May cause reduced engine power and trigger limp mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P2100 P2101 P2103 P2111 P2112 P2135
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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Keep it short and practical. Up to 500 characters.
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