Code
P0124
Generic
P — Powertrain
Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
Views:
UK: 22
EN: 33
RU: 28
AI status
Completed
Completed
100%
Causes
- Loose or corroded connector at throttle/pedal position sensor A
- Damaged, frayed, or broken wiring or pin(s) in the harness
- Intermittent failure of the throttle/pedal position sensor (potentiometer or hall element)
- Poor sensor ground or 5 V reference supply
- Intermittent ECM/PCM input fault or internal damage
- Water intrusion or contamination in connector
Symptoms
- Malfunction Indicator Lamp (MIL) may illuminate or flash intermittently
- Erratic throttle response, hesitation, or surging
- Reduced engine power or limp-home mode if ECM detects unsafe conditions
- Unstable or incorrect idle
- Intermittent stalling or inability to accelerate smoothly
What to check
- Read DTCs with a scan tool; note freeze frame and codes stored alongside P0124
- Monitor live data: throttle/pedal sensor A voltage or percent position while operating
- Perform a wiggle test on the harness and connector while watching live data for dropouts
- Visually inspect connector for corrosion, bent pins, water, or damage
- Verify 5 V reference and ground at the sensor connector with ignition ON
- Measure sensor signal voltage at closed throttle and wide-open throttle (WOT)
Signal parameters
- 5 V reference present at the sensor reference pin with ignition ON
- Sensor A signal typically ~0.2–1.0 V at closed throttle (exact values can vary by vehicle)
- Sensor A signal typically ~4.0–4.8 V near wide open throttle (WOT)
- Signal should change smoothly and monotonically with pedal or throttle movement
- Intermittent fault may appear as sudden voltage jumps, drop to 0 V, or open-circuit (infinite resistance)
Diagnostic algorithm
- Retrieve and record P0124 plus any related codes (P0120/P0121/P0220/P2135 etc.). Note freeze frame data and reproduce if possible.
- Inspect sensor connector and wiring for damage, corrosion, secure fit, and signs of water ingress. Repair or clean as needed.
- With ignition ON (engine off), verify 5 V reference and ground at the sensor connector using a multimeter. Repair reference/ground faults before further testing.
- Back-probe the sensor signal wire. Monitor signal voltage while slowly moving the throttle or pedal; look for smooth change. If the signal drops out or jumps, isolate wiring/connectors.
- Perform a wiggle test along the harness (especially at flex points) while watching live data for intermittent changes. Repair or replace damaged sections.
- If wiring and connectors check OK, measure sensor resistance if applicable or use an oscilloscope to capture intermittent behavior. Replace the sensor if internal intermittent is confirmed.
- If sensor and harness are good, check continuity and resistance between the sensor connector and the PCM input pin. Repair any short/open/splice issues.
- If all external items are good and intermittent persists, consider ECM input circuit testing or replacement per manufacturer instructions (rare).
- After repairs, clear codes, perform a thorough functional test/road test, and verify the code does not return under the same conditions.
Likely causes
- Connector with bent/corroded pins or poor contact
- Wiring chafed where it flexes (near pedal or throttle body)
- Sensor internal intermittent (age, heat soak)
- Loose mounting causing vibration-related connection loss
- Aftermarket parts or recent repair introduced poor splice/connector
Fault status
Status
Intermittent throttle/pedal position sensor A circuit fault. The ECM detected unstable, missing, or out-of-range signal from Sensor A. Fault may be stored as pending or confirmed depending on frequency; MIL may illuminate when active. Intermittency often requires dynamic testing to reproduce.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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Code
P0124
GWM
P — Powertrain
- Malfunction of the throttle position sensor / switch A
Views:
UK: 5
EN: 10
RU: 11
AI status
Completed
Completed
100%
Causes
- Loose or corroded connector at throttle/pedal position sensor A
- Damaged, frayed, or broken wiring or pin(s) in the harness
- Intermittent failure of the throttle/pedal position sensor (potentiometer or hall element)
- Poor sensor ground or 5 V reference supply
- Intermittent ECM/PCM input fault or internal damage
- Water intrusion or contamination in connector
Symptoms
- Malfunction Indicator Lamp (MIL) may illuminate or flash intermittently
- Erratic throttle response, hesitation, or surging
- Reduced engine power or limp-home mode if ECM detects unsafe conditions
- Unstable or incorrect idle
- Intermittent stalling or inability to accelerate smoothly
What to check
- Read DTCs with a scan tool; note freeze frame and codes stored alongside P0124
- Monitor live data: throttle/pedal sensor A voltage or percent position while operating
- Perform a wiggle test on the harness and connector while watching live data for dropouts
- Visually inspect connector for corrosion, bent pins, water, or damage
- Verify 5 V reference and ground at the sensor connector with ignition ON
- Measure sensor signal voltage at closed throttle and wide-open throttle (WOT)
Signal parameters
- 5 V reference present at the sensor reference pin with ignition ON
- Sensor A signal typically ~0.2–1.0 V at closed throttle (exact values can vary by vehicle)
- Sensor A signal typically ~4.0–4.8 V near wide open throttle (WOT)
- Signal should change smoothly and monotonically with pedal or throttle movement
- Intermittent fault may appear as sudden voltage jumps, drop to 0 V, or open-circuit (infinite resistance)
Diagnostic algorithm
- Retrieve and record P0124 plus any related codes (P0120/P0121/P0220/P2135 etc.). Note freeze frame data and reproduce if possible.
- Inspect sensor connector and wiring for damage, corrosion, secure fit, and signs of water ingress. Repair or clean as needed.
- With ignition ON (engine off), verify 5 V reference and ground at the sensor connector using a multimeter. Repair reference/ground faults before further testing.
- Back-probe the sensor signal wire. Monitor signal voltage while slowly moving the throttle or pedal; look for smooth change. If the signal drops out or jumps, isolate wiring/connectors.
- Perform a wiggle test along the harness (especially at flex points) while watching live data for intermittent changes. Repair or replace damaged sections.
- If wiring and connectors check OK, measure sensor resistance if applicable or use an oscilloscope to capture intermittent behavior. Replace the sensor if internal intermittent is confirmed.
- If sensor and harness are good, check continuity and resistance between the sensor connector and the PCM input pin. Repair any short/open/splice issues.
- If all external items are good and intermittent persists, consider ECM input circuit testing or replacement per manufacturer instructions (rare).
- After repairs, clear codes, perform a thorough functional test/road test, and verify the code does not return under the same conditions.
Likely causes
- Connector with bent/corroded pins or poor contact
- Wiring chafed where it flexes (near pedal or throttle body)
- Sensor internal intermittent (age, heat soak)
- Loose mounting causing vibration-related connection loss
- Aftermarket parts or recent repair introduced poor splice/connector
Fault status
Status
Intermittent throttle/pedal position sensor A circuit fault. The ECM detected unstable, missing, or out-of-range signal from Sensor A. Fault may be stored as pending or confirmed depending on frequency; MIL may illuminate when active. Intermittency often requires dynamic testing to reproduce.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
Similar codes
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Code
P0124
HUMMER
P — Powertrain
Throttle Position Sensor 1 Circuit Intermittent
Views:
UK: 15
EN: 18
RU: 21
AI status
Completed
Completed
100%
Causes
- Loose or corroded connector at throttle/pedal position sensor A
- Damaged, frayed, or broken wiring or pin(s) in the harness
- Intermittent failure of the throttle/pedal position sensor (potentiometer or hall element)
- Poor sensor ground or 5 V reference supply
- Intermittent ECM/PCM input fault or internal damage
- Water intrusion or contamination in connector
Symptoms
- Malfunction Indicator Lamp (MIL) may illuminate or flash intermittently
- Erratic throttle response, hesitation, or surging
- Reduced engine power or limp-home mode if ECM detects unsafe conditions
- Unstable or incorrect idle
- Intermittent stalling or inability to accelerate smoothly
What to check
- Read DTCs with a scan tool; note freeze frame and codes stored alongside P0124
- Monitor live data: throttle/pedal sensor A voltage or percent position while operating
- Perform a wiggle test on the harness and connector while watching live data for dropouts
- Visually inspect connector for corrosion, bent pins, water, or damage
- Verify 5 V reference and ground at the sensor connector with ignition ON
- Measure sensor signal voltage at closed throttle and wide-open throttle (WOT)
Signal parameters
- 5 V reference present at the sensor reference pin with ignition ON
- Sensor A signal typically ~0.2–1.0 V at closed throttle (exact values can vary by vehicle)
- Sensor A signal typically ~4.0–4.8 V near wide open throttle (WOT)
- Signal should change smoothly and monotonically with pedal or throttle movement
- Intermittent fault may appear as sudden voltage jumps, drop to 0 V, or open-circuit (infinite resistance)
Diagnostic algorithm
- Retrieve and record P0124 plus any related codes (P0120/P0121/P0220/P2135 etc.). Note freeze frame data and reproduce if possible.
- Inspect sensor connector and wiring for damage, corrosion, secure fit, and signs of water ingress. Repair or clean as needed.
- With ignition ON (engine off), verify 5 V reference and ground at the sensor connector using a multimeter. Repair reference/ground faults before further testing.
- Back-probe the sensor signal wire. Monitor signal voltage while slowly moving the throttle or pedal; look for smooth change. If the signal drops out or jumps, isolate wiring/connectors.
- Perform a wiggle test along the harness (especially at flex points) while watching live data for intermittent changes. Repair or replace damaged sections.
- If wiring and connectors check OK, measure sensor resistance if applicable or use an oscilloscope to capture intermittent behavior. Replace the sensor if internal intermittent is confirmed.
- If sensor and harness are good, check continuity and resistance between the sensor connector and the PCM input pin. Repair any short/open/splice issues.
- If all external items are good and intermittent persists, consider ECM input circuit testing or replacement per manufacturer instructions (rare).
- After repairs, clear codes, perform a thorough functional test/road test, and verify the code does not return under the same conditions.
Likely causes
- Connector with bent/corroded pins or poor contact
- Wiring chafed where it flexes (near pedal or throttle body)
- Sensor internal intermittent (age, heat soak)
- Loose mounting causing vibration-related connection loss
- Aftermarket parts or recent repair introduced poor splice/connector
Fault status
Status
Intermittent throttle/pedal position sensor A circuit fault. The ECM detected unstable, missing, or out-of-range signal from Sensor A. Fault may be stored as pending or confirmed depending on frequency; MIL may illuminate when active. Intermittency often requires dynamic testing to reproduce.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
Similar codes
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Code
P0124
LAND ROVER
P — Powertrain
Throttle position sensor Intermittent circuit
Views:
UK: 8
EN: 16
RU: 16
AI status
Completed
Completed
100%
Causes
- Loose or corroded connector at throttle/pedal position sensor A
- Damaged, frayed, or broken wiring or pin(s) in the harness
- Intermittent failure of the throttle/pedal position sensor (potentiometer or hall element)
- Poor sensor ground or 5 V reference supply
- Intermittent ECM/PCM input fault or internal damage
- Water intrusion or contamination in connector
Symptoms
- Malfunction Indicator Lamp (MIL) may illuminate or flash intermittently
- Erratic throttle response, hesitation, or surging
- Reduced engine power or limp-home mode if ECM detects unsafe conditions
- Unstable or incorrect idle
- Intermittent stalling or inability to accelerate smoothly
What to check
- Read DTCs with a scan tool; note freeze frame and codes stored alongside P0124
- Monitor live data: throttle/pedal sensor A voltage or percent position while operating
- Perform a wiggle test on the harness and connector while watching live data for dropouts
- Visually inspect connector for corrosion, bent pins, water, or damage
- Verify 5 V reference and ground at the sensor connector with ignition ON
- Measure sensor signal voltage at closed throttle and wide-open throttle (WOT)
Signal parameters
- 5 V reference present at the sensor reference pin with ignition ON
- Sensor A signal typically ~0.2–1.0 V at closed throttle (exact values can vary by vehicle)
- Sensor A signal typically ~4.0–4.8 V near wide open throttle (WOT)
- Signal should change smoothly and monotonically with pedal or throttle movement
- Intermittent fault may appear as sudden voltage jumps, drop to 0 V, or open-circuit (infinite resistance)
Diagnostic algorithm
- Retrieve and record P0124 plus any related codes (P0120/P0121/P0220/P2135 etc.). Note freeze frame data and reproduce if possible.
- Inspect sensor connector and wiring for damage, corrosion, secure fit, and signs of water ingress. Repair or clean as needed.
- With ignition ON (engine off), verify 5 V reference and ground at the sensor connector using a multimeter. Repair reference/ground faults before further testing.
- Back-probe the sensor signal wire. Monitor signal voltage while slowly moving the throttle or pedal; look for smooth change. If the signal drops out or jumps, isolate wiring/connectors.
- Perform a wiggle test along the harness (especially at flex points) while watching live data for intermittent changes. Repair or replace damaged sections.
- If wiring and connectors check OK, measure sensor resistance if applicable or use an oscilloscope to capture intermittent behavior. Replace the sensor if internal intermittent is confirmed.
- If sensor and harness are good, check continuity and resistance between the sensor connector and the PCM input pin. Repair any short/open/splice issues.
- If all external items are good and intermittent persists, consider ECM input circuit testing or replacement per manufacturer instructions (rare).
- After repairs, clear codes, perform a thorough functional test/road test, and verify the code does not return under the same conditions.
Likely causes
- Connector with bent/corroded pins or poor contact
- Wiring chafed where it flexes (near pedal or throttle body)
- Sensor internal intermittent (age, heat soak)
- Loose mounting causing vibration-related connection loss
- Aftermarket parts or recent repair introduced poor splice/connector
Fault status
Status
Intermittent throttle/pedal position sensor A circuit fault. The ECM detected unstable, missing, or out-of-range signal from Sensor A. Fault may be stored as pending or confirmed depending on frequency; MIL may illuminate when active. Intermittency often requires dynamic testing to reproduce.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
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Was this AI description helpful?
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