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Home / DTC / P2101 — Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle control motor failure, Wiring issue

P2101 — Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle control motor failure, Wiring issue

Detailed page for trouble code P2101.

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Code

P2101

AUDI P — Powertrain

Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle control motor failure, Wiring issue

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

Causes

  • Accelerator Pedal Position (APP) sensor assembly failure
  • Throttle body / throttle control motor failure
  • Powertrain Control Module (PCM) internal fault
  • Open, shorted, damaged, or corroded wiring and connectors in APP/throttle circuits
  • Poor ground or 5V reference supply failure
  • Software or calibration issue between APP and throttle control

Symptoms

  • MIL illuminated and P2101 logged
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Cruise control disabled
  • Possible rough idle, stalling, or inability to accelerate normally
  • Intermittent or permanent loss of driveability

What to check

  • Retrieve all stored codes and freeze frame data with a capable scan tool
  • Inspect APP and throttle body connectors for corrosion, bent pins, water intrusion and secure fit
  • Visually inspect wiring harness along pedal to firewall and engine bay for damage or chafing
  • Check 5V reference and ground at APP and throttle body with key ON (back-probe)
  • Back-probe APP signal pins while operating pedal; verify sensor voltages change smoothly and correlate between redundant sensors
  • Command throttle actuator using scan tool actuator test and observe response

Signal parameters

  • APP sensors: typically two redundant signals; voltages roughly 0.5–4.5 V that change smoothly and correlate to pedal travel
  • 5V reference present at sensor supply pin (approx. 5.0 V) and good ground
  • Throttle position sensor: correlated change in signal voltage as throttle is commanded
  • Throttle actuator: PWM duty cycle 0–100% or specific frequency (varies by model) when commanded by PCM
  • Resistance or continuity: no short to ground or battery on signal lines; typical sensor input impedance per service data

Diagnostic algorithm

  1. Read and record all DTCs, freeze frame and live data for APP channels, throttle position, and actuator status.
  2. Observe live APP sensor voltages (both channels) while slowly pressing and releasing pedal. Verify both signals change smoothly without dropouts and have expected correlation.
  3. Verify 5V reference and ground at APP connector. Repair any missing reference or poor ground before further testing.
  4. Inspect wiring harness from pedal to PCM and throttle body to PCM for damage, corrosion, or pin issues. Wiggle test while monitoring signals for intermittent faults.
  5. Back-probe throttle body connector and command throttle actuator using scan tool. Confirm throttle plate moves and feedback position matches commanded value.
  6. If actuator does not respond, check power/ground to actuator and measure actuator driver signals from PCM. If driver signals absent or abnormal, suspect PCM or wiring to PCM.
  7. If APP signals are out-of-range or noisy, bench-test or swap pedal assembly (if available) to confirm. Replace APP if confirmed faulty.
  8. If actuator is mechanically seized or motor fails, replace throttle body assembly and perform required adaptations/relearn.
  9. If wiring and components test OK, consider PCM failure or software/calibration issue. Check for ECU updates and perform PCM tests per manufacturer procedures; replace PCM only if supported by diagnostics.
  10. After repairs, clear codes, perform throttle/APP relearn as required, and verify driveability and that DTC does not return.

Likely causes

  • Corroded or loose connector at the APP or throttle body
  • Broken or chafed wiring between APP and PCM or PCM and throttle actuator
  • Failed APP potentiometer or Hall-effect sensors (loss of signal or out-of-range readings)
  • Throttle actuator motor worn or mechanically stuck
  • PCM driver for throttle actuator degraded or failed
  • Recent work or water intrusion at pedal/throttle wiring causing damage

Fault status

⚠️ Status
P2101 — Accelerator Pedal Position/throttle control circuit fault. Indicates APP assembly, throttle actuator, wiring/connectors, or PCM issue causing out-of-range or failed signals; vehicle may enter limp mode and set MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P2100 P2102 P2122 P2123 P2135 P2119
Repair manuals

Manual library for AUDI

1,160

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AUDI

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Code

P2101

Generic P — Powertrain

Throttle Actuator A Control Motor Circuit Range/Performance

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

Causes

  • Accelerator Pedal Position (APP) sensor assembly failure
  • Throttle body / throttle control motor failure
  • Powertrain Control Module (PCM) internal fault
  • Open, shorted, damaged, or corroded wiring and connectors in APP/throttle circuits
  • Poor ground or 5V reference supply failure
  • Software or calibration issue between APP and throttle control

Symptoms

  • MIL illuminated and P2101 logged
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Cruise control disabled
  • Possible rough idle, stalling, or inability to accelerate normally
  • Intermittent or permanent loss of driveability

What to check

  • Retrieve all stored codes and freeze frame data with a capable scan tool
  • Inspect APP and throttle body connectors for corrosion, bent pins, water intrusion and secure fit
  • Visually inspect wiring harness along pedal to firewall and engine bay for damage or chafing
  • Check 5V reference and ground at APP and throttle body with key ON (back-probe)
  • Back-probe APP signal pins while operating pedal; verify sensor voltages change smoothly and correlate between redundant sensors
  • Command throttle actuator using scan tool actuator test and observe response

Signal parameters

  • APP sensors: typically two redundant signals; voltages roughly 0.5–4.5 V that change smoothly and correlate to pedal travel
  • 5V reference present at sensor supply pin (approx. 5.0 V) and good ground
  • Throttle position sensor: correlated change in signal voltage as throttle is commanded
  • Throttle actuator: PWM duty cycle 0–100% or specific frequency (varies by model) when commanded by PCM
  • Resistance or continuity: no short to ground or battery on signal lines; typical sensor input impedance per service data

Diagnostic algorithm

  1. Read and record all DTCs, freeze frame and live data for APP channels, throttle position, and actuator status.
  2. Observe live APP sensor voltages (both channels) while slowly pressing and releasing pedal. Verify both signals change smoothly without dropouts and have expected correlation.
  3. Verify 5V reference and ground at APP connector. Repair any missing reference or poor ground before further testing.
  4. Inspect wiring harness from pedal to PCM and throttle body to PCM for damage, corrosion, or pin issues. Wiggle test while monitoring signals for intermittent faults.
  5. Back-probe throttle body connector and command throttle actuator using scan tool. Confirm throttle plate moves and feedback position matches commanded value.
  6. If actuator does not respond, check power/ground to actuator and measure actuator driver signals from PCM. If driver signals absent or abnormal, suspect PCM or wiring to PCM.
  7. If APP signals are out-of-range or noisy, bench-test or swap pedal assembly (if available) to confirm. Replace APP if confirmed faulty.
  8. If actuator is mechanically seized or motor fails, replace throttle body assembly and perform required adaptations/relearn.
  9. If wiring and components test OK, consider PCM failure or software/calibration issue. Check for ECU updates and perform PCM tests per manufacturer procedures; replace PCM only if supported by diagnostics.
  10. After repairs, clear codes, perform throttle/APP relearn as required, and verify driveability and that DTC does not return.

Likely causes

  • Corroded or loose connector at the APP or throttle body
  • Broken or chafed wiring between APP and PCM or PCM and throttle actuator
  • Failed APP potentiometer or Hall-effect sensors (loss of signal or out-of-range readings)
  • Throttle actuator motor worn or mechanically stuck
  • PCM driver for throttle actuator degraded or failed
  • Recent work or water intrusion at pedal/throttle wiring causing damage

Fault status

⚠️ Status
P2101 — Accelerator Pedal Position/throttle control circuit fault. Indicates APP assembly, throttle actuator, wiring/connectors, or PCM issue causing out-of-range or failed signals; vehicle may enter limp mode and set MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P2101

HUMMER P — Powertrain

Control Module Throttle Actuator Position Performance

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

Causes

  • Accelerator Pedal Position (APP) sensor assembly failure
  • Throttle body / throttle control motor failure
  • Powertrain Control Module (PCM) internal fault
  • Open, shorted, damaged, or corroded wiring and connectors in APP/throttle circuits
  • Poor ground or 5V reference supply failure
  • Software or calibration issue between APP and throttle control

Symptoms

  • MIL illuminated and P2101 logged
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Cruise control disabled
  • Possible rough idle, stalling, or inability to accelerate normally
  • Intermittent or permanent loss of driveability

What to check

  • Retrieve all stored codes and freeze frame data with a capable scan tool
  • Inspect APP and throttle body connectors for corrosion, bent pins, water intrusion and secure fit
  • Visually inspect wiring harness along pedal to firewall and engine bay for damage or chafing
  • Check 5V reference and ground at APP and throttle body with key ON (back-probe)
  • Back-probe APP signal pins while operating pedal; verify sensor voltages change smoothly and correlate between redundant sensors
  • Command throttle actuator using scan tool actuator test and observe response

Signal parameters

  • APP sensors: typically two redundant signals; voltages roughly 0.5–4.5 V that change smoothly and correlate to pedal travel
  • 5V reference present at sensor supply pin (approx. 5.0 V) and good ground
  • Throttle position sensor: correlated change in signal voltage as throttle is commanded
  • Throttle actuator: PWM duty cycle 0–100% or specific frequency (varies by model) when commanded by PCM
  • Resistance or continuity: no short to ground or battery on signal lines; typical sensor input impedance per service data

Diagnostic algorithm

  1. Read and record all DTCs, freeze frame and live data for APP channels, throttle position, and actuator status.
  2. Observe live APP sensor voltages (both channels) while slowly pressing and releasing pedal. Verify both signals change smoothly without dropouts and have expected correlation.
  3. Verify 5V reference and ground at APP connector. Repair any missing reference or poor ground before further testing.
  4. Inspect wiring harness from pedal to PCM and throttle body to PCM for damage, corrosion, or pin issues. Wiggle test while monitoring signals for intermittent faults.
  5. Back-probe throttle body connector and command throttle actuator using scan tool. Confirm throttle plate moves and feedback position matches commanded value.
  6. If actuator does not respond, check power/ground to actuator and measure actuator driver signals from PCM. If driver signals absent or abnormal, suspect PCM or wiring to PCM.
  7. If APP signals are out-of-range or noisy, bench-test or swap pedal assembly (if available) to confirm. Replace APP if confirmed faulty.
  8. If actuator is mechanically seized or motor fails, replace throttle body assembly and perform required adaptations/relearn.
  9. If wiring and components test OK, consider PCM failure or software/calibration issue. Check for ECU updates and perform PCM tests per manufacturer procedures; replace PCM only if supported by diagnostics.
  10. After repairs, clear codes, perform throttle/APP relearn as required, and verify driveability and that DTC does not return.

Likely causes

  • Corroded or loose connector at the APP or throttle body
  • Broken or chafed wiring between APP and PCM or PCM and throttle actuator
  • Failed APP potentiometer or Hall-effect sensors (loss of signal or out-of-range readings)
  • Throttle actuator motor worn or mechanically stuck
  • PCM driver for throttle actuator degraded or failed
  • Recent work or water intrusion at pedal/throttle wiring causing damage

Fault status

⚠️ Status
P2101 — Accelerator Pedal Position/throttle control circuit fault. Indicates APP assembly, throttle actuator, wiring/connectors, or PCM issue causing out-of-range or failed signals; vehicle may enter limp mode and set MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P2100 P2102 P2122 P2123 P2135 P2119
Repair manuals

Manual library for HUMMER

138

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HUMMER

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Code

P2101

LAND ROVER P — Powertrain

Throttle actuator control motor - circuit range / performance

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

Causes

  • Accelerator Pedal Position (APP) sensor assembly failure
  • Throttle body / throttle control motor failure
  • Powertrain Control Module (PCM) internal fault
  • Open, shorted, damaged, or corroded wiring and connectors in APP/throttle circuits
  • Poor ground or 5V reference supply failure
  • Software or calibration issue between APP and throttle control

Symptoms

  • MIL illuminated and P2101 logged
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Cruise control disabled
  • Possible rough idle, stalling, or inability to accelerate normally
  • Intermittent or permanent loss of driveability

What to check

  • Retrieve all stored codes and freeze frame data with a capable scan tool
  • Inspect APP and throttle body connectors for corrosion, bent pins, water intrusion and secure fit
  • Visually inspect wiring harness along pedal to firewall and engine bay for damage or chafing
  • Check 5V reference and ground at APP and throttle body with key ON (back-probe)
  • Back-probe APP signal pins while operating pedal; verify sensor voltages change smoothly and correlate between redundant sensors
  • Command throttle actuator using scan tool actuator test and observe response

Signal parameters

  • APP sensors: typically two redundant signals; voltages roughly 0.5–4.5 V that change smoothly and correlate to pedal travel
  • 5V reference present at sensor supply pin (approx. 5.0 V) and good ground
  • Throttle position sensor: correlated change in signal voltage as throttle is commanded
  • Throttle actuator: PWM duty cycle 0–100% or specific frequency (varies by model) when commanded by PCM
  • Resistance or continuity: no short to ground or battery on signal lines; typical sensor input impedance per service data

Diagnostic algorithm

  1. Read and record all DTCs, freeze frame and live data for APP channels, throttle position, and actuator status.
  2. Observe live APP sensor voltages (both channels) while slowly pressing and releasing pedal. Verify both signals change smoothly without dropouts and have expected correlation.
  3. Verify 5V reference and ground at APP connector. Repair any missing reference or poor ground before further testing.
  4. Inspect wiring harness from pedal to PCM and throttle body to PCM for damage, corrosion, or pin issues. Wiggle test while monitoring signals for intermittent faults.
  5. Back-probe throttle body connector and command throttle actuator using scan tool. Confirm throttle plate moves and feedback position matches commanded value.
  6. If actuator does not respond, check power/ground to actuator and measure actuator driver signals from PCM. If driver signals absent or abnormal, suspect PCM or wiring to PCM.
  7. If APP signals are out-of-range or noisy, bench-test or swap pedal assembly (if available) to confirm. Replace APP if confirmed faulty.
  8. If actuator is mechanically seized or motor fails, replace throttle body assembly and perform required adaptations/relearn.
  9. If wiring and components test OK, consider PCM failure or software/calibration issue. Check for ECU updates and perform PCM tests per manufacturer procedures; replace PCM only if supported by diagnostics.
  10. After repairs, clear codes, perform throttle/APP relearn as required, and verify driveability and that DTC does not return.

Likely causes

  • Corroded or loose connector at the APP or throttle body
  • Broken or chafed wiring between APP and PCM or PCM and throttle actuator
  • Failed APP potentiometer or Hall-effect sensors (loss of signal or out-of-range readings)
  • Throttle actuator motor worn or mechanically stuck
  • PCM driver for throttle actuator degraded or failed
  • Recent work or water intrusion at pedal/throttle wiring causing damage

Fault status

⚠️ Status
P2101 — Accelerator Pedal Position/throttle control circuit fault. Indicates APP assembly, throttle actuator, wiring/connectors, or PCM issue causing out-of-range or failed signals; vehicle may enter limp mode and set MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P2100 P2102 P2122 P2123 P2135 P2119
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

P2101

MERCEDES-BENZ P — Powertrain

Throttle Actuator Control Motor Circuit Range/Performance

Brand: MERCEDES-BENZ
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Accelerator Pedal Position (APP) sensor assembly failure
  • Throttle body / throttle control motor failure
  • Powertrain Control Module (PCM) internal fault
  • Open, shorted, damaged, or corroded wiring and connectors in APP/throttle circuits
  • Poor ground or 5V reference supply failure
  • Software or calibration issue between APP and throttle control

Symptoms

  • MIL illuminated and P2101 logged
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Cruise control disabled
  • Possible rough idle, stalling, or inability to accelerate normally
  • Intermittent or permanent loss of driveability

What to check

  • Retrieve all stored codes and freeze frame data with a capable scan tool
  • Inspect APP and throttle body connectors for corrosion, bent pins, water intrusion and secure fit
  • Visually inspect wiring harness along pedal to firewall and engine bay for damage or chafing
  • Check 5V reference and ground at APP and throttle body with key ON (back-probe)
  • Back-probe APP signal pins while operating pedal; verify sensor voltages change smoothly and correlate between redundant sensors
  • Command throttle actuator using scan tool actuator test and observe response

Signal parameters

  • APP sensors: typically two redundant signals; voltages roughly 0.5–4.5 V that change smoothly and correlate to pedal travel
  • 5V reference present at sensor supply pin (approx. 5.0 V) and good ground
  • Throttle position sensor: correlated change in signal voltage as throttle is commanded
  • Throttle actuator: PWM duty cycle 0–100% or specific frequency (varies by model) when commanded by PCM
  • Resistance or continuity: no short to ground or battery on signal lines; typical sensor input impedance per service data

Diagnostic algorithm

  1. Read and record all DTCs, freeze frame and live data for APP channels, throttle position, and actuator status.
  2. Observe live APP sensor voltages (both channels) while slowly pressing and releasing pedal. Verify both signals change smoothly without dropouts and have expected correlation.
  3. Verify 5V reference and ground at APP connector. Repair any missing reference or poor ground before further testing.
  4. Inspect wiring harness from pedal to PCM and throttle body to PCM for damage, corrosion, or pin issues. Wiggle test while monitoring signals for intermittent faults.
  5. Back-probe throttle body connector and command throttle actuator using scan tool. Confirm throttle plate moves and feedback position matches commanded value.
  6. If actuator does not respond, check power/ground to actuator and measure actuator driver signals from PCM. If driver signals absent or abnormal, suspect PCM or wiring to PCM.
  7. If APP signals are out-of-range or noisy, bench-test or swap pedal assembly (if available) to confirm. Replace APP if confirmed faulty.
  8. If actuator is mechanically seized or motor fails, replace throttle body assembly and perform required adaptations/relearn.
  9. If wiring and components test OK, consider PCM failure or software/calibration issue. Check for ECU updates and perform PCM tests per manufacturer procedures; replace PCM only if supported by diagnostics.
  10. After repairs, clear codes, perform throttle/APP relearn as required, and verify driveability and that DTC does not return.

Likely causes

  • Corroded or loose connector at the APP or throttle body
  • Broken or chafed wiring between APP and PCM or PCM and throttle actuator
  • Failed APP potentiometer or Hall-effect sensors (loss of signal or out-of-range readings)
  • Throttle actuator motor worn or mechanically stuck
  • PCM driver for throttle actuator degraded or failed
  • Recent work or water intrusion at pedal/throttle wiring causing damage

Fault status

⚠️ Status
P2101 — Accelerator Pedal Position/throttle control circuit fault. Indicates APP assembly, throttle actuator, wiring/connectors, or PCM issue causing out-of-range or failed signals; vehicle may enter limp mode and set MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P2100 P2102 P2122 P2123 P2135 P2119
856

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MERCEDES-BENZ

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Code

P2101

MITSUBISHI P — Powertrain

ETV motor magneto

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

Causes

  • Accelerator Pedal Position (APP) sensor assembly failure
  • Throttle body / throttle control motor failure
  • Powertrain Control Module (PCM) internal fault
  • Open, shorted, damaged, or corroded wiring and connectors in APP/throttle circuits
  • Poor ground or 5V reference supply failure
  • Software or calibration issue between APP and throttle control

Symptoms

  • MIL illuminated and P2101 logged
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Cruise control disabled
  • Possible rough idle, stalling, or inability to accelerate normally
  • Intermittent or permanent loss of driveability

What to check

  • Retrieve all stored codes and freeze frame data with a capable scan tool
  • Inspect APP and throttle body connectors for corrosion, bent pins, water intrusion and secure fit
  • Visually inspect wiring harness along pedal to firewall and engine bay for damage or chafing
  • Check 5V reference and ground at APP and throttle body with key ON (back-probe)
  • Back-probe APP signal pins while operating pedal; verify sensor voltages change smoothly and correlate between redundant sensors
  • Command throttle actuator using scan tool actuator test and observe response

Signal parameters

  • APP sensors: typically two redundant signals; voltages roughly 0.5–4.5 V that change smoothly and correlate to pedal travel
  • 5V reference present at sensor supply pin (approx. 5.0 V) and good ground
  • Throttle position sensor: correlated change in signal voltage as throttle is commanded
  • Throttle actuator: PWM duty cycle 0–100% or specific frequency (varies by model) when commanded by PCM
  • Resistance or continuity: no short to ground or battery on signal lines; typical sensor input impedance per service data

Diagnostic algorithm

  1. Read and record all DTCs, freeze frame and live data for APP channels, throttle position, and actuator status.
  2. Observe live APP sensor voltages (both channels) while slowly pressing and releasing pedal. Verify both signals change smoothly without dropouts and have expected correlation.
  3. Verify 5V reference and ground at APP connector. Repair any missing reference or poor ground before further testing.
  4. Inspect wiring harness from pedal to PCM and throttle body to PCM for damage, corrosion, or pin issues. Wiggle test while monitoring signals for intermittent faults.
  5. Back-probe throttle body connector and command throttle actuator using scan tool. Confirm throttle plate moves and feedback position matches commanded value.
  6. If actuator does not respond, check power/ground to actuator and measure actuator driver signals from PCM. If driver signals absent or abnormal, suspect PCM or wiring to PCM.
  7. If APP signals are out-of-range or noisy, bench-test or swap pedal assembly (if available) to confirm. Replace APP if confirmed faulty.
  8. If actuator is mechanically seized or motor fails, replace throttle body assembly and perform required adaptations/relearn.
  9. If wiring and components test OK, consider PCM failure or software/calibration issue. Check for ECU updates and perform PCM tests per manufacturer procedures; replace PCM only if supported by diagnostics.
  10. After repairs, clear codes, perform throttle/APP relearn as required, and verify driveability and that DTC does not return.

Likely causes

  • Corroded or loose connector at the APP or throttle body
  • Broken or chafed wiring between APP and PCM or PCM and throttle actuator
  • Failed APP potentiometer or Hall-effect sensors (loss of signal or out-of-range readings)
  • Throttle actuator motor worn or mechanically stuck
  • PCM driver for throttle actuator degraded or failed
  • Recent work or water intrusion at pedal/throttle wiring causing damage

Fault status

⚠️ Status
P2101 — Accelerator Pedal Position/throttle control circuit fault. Indicates APP assembly, throttle actuator, wiring/connectors, or PCM issue causing out-of-range or failed signals; vehicle may enter limp mode and set MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P2100 P2102 P2122 P2123 P2135 P2119
406

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MITSUBISHI

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