Code
P2128
Generic
P — Powertrain
Throttle/Pedal Position Sensor/Switch E Circuit High
Views:
UK: 13
EN: 23
RU: 23
AI status
Completed
Completed
100%
Causes
- Faulty accelerator pedal position sensor or throttle position sensor (sensor E)
- Short to battery voltage in the sensor wiring harness or connector
- Corroded, bent or damaged connector pins or wiring (open/short)
- Poor or missing ground or reference voltage to the sensor
- PCM/ECM internal fault or damaged input circuitry
- Water intrusion or contamination of connector or sensor
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated (Check Engine Light)
- Reduced engine power / limp-home mode or limited throttle response
- Unresponsive or erratic accelerator pedal behavior
- Engine may surge, hesitate, or fail to idle smoothly
- Stored freeze-frame data showing high sensor voltage
What to check
- Read and record DTCs and freeze-frame data with a scan tool
- Visually inspect connectors, wiring harness and sensor for corrosion, damage or water intrusion
- Check that the 5V reference and ground to the sensor are present at the connector with key ON, engine OFF
- Backprobe signal wire and measure voltage with pedal at rest and while operated; compare to expected ranges
- Disconnect the sensor and re-check the voltage at the harness connector to determine if the high signal is coming from the wiring/PCM or the sensor
- Wiggle test harness while monitoring live data to reveal intermittent faults
Signal parameters
- Typical reference (VREF) supply: ~5.0 V (vehicle-specific)
- Expected sensor signal range: ~0.5 V up to ~4.5 V depending on pedal position and sensor type
- Circuit High condition threshold: signal approaching battery voltage or above ~4.8–4.9 V (varies by manufacturer)
- Low/idle signal commonly near 0.3–1.0 V on many sensors (vehicle-specific)
Diagnostic algorithm
- Retrieve and record all codes, freeze-frame and live data. Confirm P2128 is current and note related throttle/pedal codes.
- Visually inspect pedal/throttle sensor connectors and wiring for damage, corrosion or moisture. Repair any obvious issues.
- With key ON, engine OFF, backprobe the sensor connector: verify VREF (~5V) and ground. If VREF or ground missing, trace and repair supply/ground wiring and retest.
- Measure the signal (SIG) voltage at the harness with the sensor connected while slowly moving the pedal. Note if voltage is abnormally high or does not change.
- Disconnect the sensor and measure SIG at the harness again. If SIG remains high with sensor disconnected, suspect wiring short to battery or PCM output; if SIG drops to open-circuit/near 0V, suspect the sensor.
- Perform continuity checks between SIG wire and battery positive to find a short; check for shorts to other circuits. Repair wiring as necessary.
- If wiring checks good and sensor shows high output while disconnected or when powered on, replace the sensor. If replacement does not clear fault, consider PCM input fault and consult manufacturer service data for PCM testing and possible reprogramming or replacement.
- After repairs, clear codes, perform relearn procedures if required, and road test to confirm fault does not return.
Likely causes
- Damaged or corroded connector at the pedal/throttle assembly
- Short to constant battery voltage on the signal wire
- Failed pedal/throttle position sensor (sensor E)
- Faulty or intermittent ground or 5V reference supply from the PCM
- PCM input damaged (less likely)
Fault status
Status
PCM detected an abnormally high voltage on the Throttle/Pedal Position Sensor E circuit (P2128). MIL set; vehicle may enter reduced-power/limp mode. Inspect sensor, wiring, and PCM input circuitry.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
1
LAND ROVER 2
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualOfficial workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.
199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualWorkshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.
199,00 UAH
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Code
P2128
HUMMER
P — Powertrain
Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage
Views:
UK: 6
EN: 17
RU: 12
AI status
Completed
Completed
100%
Causes
- Faulty accelerator pedal position sensor or throttle position sensor (sensor E)
- Short to battery voltage in the sensor wiring harness or connector
- Corroded, bent or damaged connector pins or wiring (open/short)
- Poor or missing ground or reference voltage to the sensor
- PCM/ECM internal fault or damaged input circuitry
- Water intrusion or contamination of connector or sensor
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated (Check Engine Light)
- Reduced engine power / limp-home mode or limited throttle response
- Unresponsive or erratic accelerator pedal behavior
- Engine may surge, hesitate, or fail to idle smoothly
- Stored freeze-frame data showing high sensor voltage
What to check
- Read and record DTCs and freeze-frame data with a scan tool
- Visually inspect connectors, wiring harness and sensor for corrosion, damage or water intrusion
- Check that the 5V reference and ground to the sensor are present at the connector with key ON, engine OFF
- Backprobe signal wire and measure voltage with pedal at rest and while operated; compare to expected ranges
- Disconnect the sensor and re-check the voltage at the harness connector to determine if the high signal is coming from the wiring/PCM or the sensor
- Wiggle test harness while monitoring live data to reveal intermittent faults
Signal parameters
- Typical reference (VREF) supply: ~5.0 V (vehicle-specific)
- Expected sensor signal range: ~0.5 V up to ~4.5 V depending on pedal position and sensor type
- Circuit High condition threshold: signal approaching battery voltage or above ~4.8–4.9 V (varies by manufacturer)
- Low/idle signal commonly near 0.3–1.0 V on many sensors (vehicle-specific)
Diagnostic algorithm
- Retrieve and record all codes, freeze-frame and live data. Confirm P2128 is current and note related throttle/pedal codes.
- Visually inspect pedal/throttle sensor connectors and wiring for damage, corrosion or moisture. Repair any obvious issues.
- With key ON, engine OFF, backprobe the sensor connector: verify VREF (~5V) and ground. If VREF or ground missing, trace and repair supply/ground wiring and retest.
- Measure the signal (SIG) voltage at the harness with the sensor connected while slowly moving the pedal. Note if voltage is abnormally high or does not change.
- Disconnect the sensor and measure SIG at the harness again. If SIG remains high with sensor disconnected, suspect wiring short to battery or PCM output; if SIG drops to open-circuit/near 0V, suspect the sensor.
- Perform continuity checks between SIG wire and battery positive to find a short; check for shorts to other circuits. Repair wiring as necessary.
- If wiring checks good and sensor shows high output while disconnected or when powered on, replace the sensor. If replacement does not clear fault, consider PCM input fault and consult manufacturer service data for PCM testing and possible reprogramming or replacement.
- After repairs, clear codes, perform relearn procedures if required, and road test to confirm fault does not return.
Likely causes
- Damaged or corroded connector at the pedal/throttle assembly
- Short to constant battery voltage on the signal wire
- Failed pedal/throttle position sensor (sensor E)
- Faulty or intermittent ground or 5V reference supply from the PCM
- PCM input damaged (less likely)
Fault status
Status
PCM detected an abnormally high voltage on the Throttle/Pedal Position Sensor E circuit (P2128). MIL set; vehicle may enter reduced-power/limp mode. Inspect sensor, wiring, and PCM input circuitry.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P2128
ISUZU
P — Powertrain
Pedal Position Sensor 2 Circuit High Input
Views:
UK: 9
EN: 20
RU: 17
AI status
Completed
Completed
100%
Causes
- Faulty accelerator pedal position sensor or throttle position sensor (sensor E)
- Short to battery voltage in the sensor wiring harness or connector
- Corroded, bent or damaged connector pins or wiring (open/short)
- Poor or missing ground or reference voltage to the sensor
- PCM/ECM internal fault or damaged input circuitry
- Water intrusion or contamination of connector or sensor
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated (Check Engine Light)
- Reduced engine power / limp-home mode or limited throttle response
- Unresponsive or erratic accelerator pedal behavior
- Engine may surge, hesitate, or fail to idle smoothly
- Stored freeze-frame data showing high sensor voltage
What to check
- Read and record DTCs and freeze-frame data with a scan tool
- Visually inspect connectors, wiring harness and sensor for corrosion, damage or water intrusion
- Check that the 5V reference and ground to the sensor are present at the connector with key ON, engine OFF
- Backprobe signal wire and measure voltage with pedal at rest and while operated; compare to expected ranges
- Disconnect the sensor and re-check the voltage at the harness connector to determine if the high signal is coming from the wiring/PCM or the sensor
- Wiggle test harness while monitoring live data to reveal intermittent faults
Signal parameters
- Typical reference (VREF) supply: ~5.0 V (vehicle-specific)
- Expected sensor signal range: ~0.5 V up to ~4.5 V depending on pedal position and sensor type
- Circuit High condition threshold: signal approaching battery voltage or above ~4.8–4.9 V (varies by manufacturer)
- Low/idle signal commonly near 0.3–1.0 V on many sensors (vehicle-specific)
Diagnostic algorithm
- Retrieve and record all codes, freeze-frame and live data. Confirm P2128 is current and note related throttle/pedal codes.
- Visually inspect pedal/throttle sensor connectors and wiring for damage, corrosion or moisture. Repair any obvious issues.
- With key ON, engine OFF, backprobe the sensor connector: verify VREF (~5V) and ground. If VREF or ground missing, trace and repair supply/ground wiring and retest.
- Measure the signal (SIG) voltage at the harness with the sensor connected while slowly moving the pedal. Note if voltage is abnormally high or does not change.
- Disconnect the sensor and measure SIG at the harness again. If SIG remains high with sensor disconnected, suspect wiring short to battery or PCM output; if SIG drops to open-circuit/near 0V, suspect the sensor.
- Perform continuity checks between SIG wire and battery positive to find a short; check for shorts to other circuits. Repair wiring as necessary.
- If wiring checks good and sensor shows high output while disconnected or when powered on, replace the sensor. If replacement does not clear fault, consider PCM input fault and consult manufacturer service data for PCM testing and possible reprogramming or replacement.
- After repairs, clear codes, perform relearn procedures if required, and road test to confirm fault does not return.
Likely causes
- Damaged or corroded connector at the pedal/throttle assembly
- Short to constant battery voltage on the signal wire
- Failed pedal/throttle position sensor (sensor E)
- Faulty or intermittent ground or 5V reference supply from the PCM
- PCM input damaged (less likely)
Fault status
Status
PCM detected an abnormally high voltage on the Throttle/Pedal Position Sensor E circuit (P2128). MIL set; vehicle may enter reduced-power/limp mode. Inspect sensor, wiring, and PCM input circuitry.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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Send to email
Code
P2128
LAND ROVER
P — Powertrain
Pressure regulator / pedal position sensor / switch E input high
Views:
UK: 8
EN: 10
RU: 10
AI status
Completed
Completed
100%
Causes
- Faulty accelerator pedal position sensor or throttle position sensor (sensor E)
- Short to battery voltage in the sensor wiring harness or connector
- Corroded, bent or damaged connector pins or wiring (open/short)
- Poor or missing ground or reference voltage to the sensor
- PCM/ECM internal fault or damaged input circuitry
- Water intrusion or contamination of connector or sensor
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated (Check Engine Light)
- Reduced engine power / limp-home mode or limited throttle response
- Unresponsive or erratic accelerator pedal behavior
- Engine may surge, hesitate, or fail to idle smoothly
- Stored freeze-frame data showing high sensor voltage
What to check
- Read and record DTCs and freeze-frame data with a scan tool
- Visually inspect connectors, wiring harness and sensor for corrosion, damage or water intrusion
- Check that the 5V reference and ground to the sensor are present at the connector with key ON, engine OFF
- Backprobe signal wire and measure voltage with pedal at rest and while operated; compare to expected ranges
- Disconnect the sensor and re-check the voltage at the harness connector to determine if the high signal is coming from the wiring/PCM or the sensor
- Wiggle test harness while monitoring live data to reveal intermittent faults
Signal parameters
- Typical reference (VREF) supply: ~5.0 V (vehicle-specific)
- Expected sensor signal range: ~0.5 V up to ~4.5 V depending on pedal position and sensor type
- Circuit High condition threshold: signal approaching battery voltage or above ~4.8–4.9 V (varies by manufacturer)
- Low/idle signal commonly near 0.3–1.0 V on many sensors (vehicle-specific)
Diagnostic algorithm
- Retrieve and record all codes, freeze-frame and live data. Confirm P2128 is current and note related throttle/pedal codes.
- Visually inspect pedal/throttle sensor connectors and wiring for damage, corrosion or moisture. Repair any obvious issues.
- With key ON, engine OFF, backprobe the sensor connector: verify VREF (~5V) and ground. If VREF or ground missing, trace and repair supply/ground wiring and retest.
- Measure the signal (SIG) voltage at the harness with the sensor connected while slowly moving the pedal. Note if voltage is abnormally high or does not change.
- Disconnect the sensor and measure SIG at the harness again. If SIG remains high with sensor disconnected, suspect wiring short to battery or PCM output; if SIG drops to open-circuit/near 0V, suspect the sensor.
- Perform continuity checks between SIG wire and battery positive to find a short; check for shorts to other circuits. Repair wiring as necessary.
- If wiring checks good and sensor shows high output while disconnected or when powered on, replace the sensor. If replacement does not clear fault, consider PCM input fault and consult manufacturer service data for PCM testing and possible reprogramming or replacement.
- After repairs, clear codes, perform relearn procedures if required, and road test to confirm fault does not return.
Likely causes
- Damaged or corroded connector at the pedal/throttle assembly
- Short to constant battery voltage on the signal wire
- Failed pedal/throttle position sensor (sensor E)
- Faulty or intermittent ground or 5V reference supply from the PCM
- PCM input damaged (less likely)
Fault status
Status
PCM detected an abnormally high voltage on the Throttle/Pedal Position Sensor E circuit (P2128). MIL set; vehicle may enter reduced-power/limp mode. Inspect sensor, wiring, and PCM input circuitry.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
2
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualOfficial workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.
199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualWorkshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.
199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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Send to email
Code
P2128
MITSUBISHI
P — Powertrain
APS(sub) high
Views:
UK: 5
EN: 11
RU: 12
AI status
Completed
Completed
100%
Causes
- Faulty accelerator pedal position sensor or throttle position sensor (sensor E)
- Short to battery voltage in the sensor wiring harness or connector
- Corroded, bent or damaged connector pins or wiring (open/short)
- Poor or missing ground or reference voltage to the sensor
- PCM/ECM internal fault or damaged input circuitry
- Water intrusion or contamination of connector or sensor
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated (Check Engine Light)
- Reduced engine power / limp-home mode or limited throttle response
- Unresponsive or erratic accelerator pedal behavior
- Engine may surge, hesitate, or fail to idle smoothly
- Stored freeze-frame data showing high sensor voltage
What to check
- Read and record DTCs and freeze-frame data with a scan tool
- Visually inspect connectors, wiring harness and sensor for corrosion, damage or water intrusion
- Check that the 5V reference and ground to the sensor are present at the connector with key ON, engine OFF
- Backprobe signal wire and measure voltage with pedal at rest and while operated; compare to expected ranges
- Disconnect the sensor and re-check the voltage at the harness connector to determine if the high signal is coming from the wiring/PCM or the sensor
- Wiggle test harness while monitoring live data to reveal intermittent faults
Signal parameters
- Typical reference (VREF) supply: ~5.0 V (vehicle-specific)
- Expected sensor signal range: ~0.5 V up to ~4.5 V depending on pedal position and sensor type
- Circuit High condition threshold: signal approaching battery voltage or above ~4.8–4.9 V (varies by manufacturer)
- Low/idle signal commonly near 0.3–1.0 V on many sensors (vehicle-specific)
Diagnostic algorithm
- Retrieve and record all codes, freeze-frame and live data. Confirm P2128 is current and note related throttle/pedal codes.
- Visually inspect pedal/throttle sensor connectors and wiring for damage, corrosion or moisture. Repair any obvious issues.
- With key ON, engine OFF, backprobe the sensor connector: verify VREF (~5V) and ground. If VREF or ground missing, trace and repair supply/ground wiring and retest.
- Measure the signal (SIG) voltage at the harness with the sensor connected while slowly moving the pedal. Note if voltage is abnormally high or does not change.
- Disconnect the sensor and measure SIG at the harness again. If SIG remains high with sensor disconnected, suspect wiring short to battery or PCM output; if SIG drops to open-circuit/near 0V, suspect the sensor.
- Perform continuity checks between SIG wire and battery positive to find a short; check for shorts to other circuits. Repair wiring as necessary.
- If wiring checks good and sensor shows high output while disconnected or when powered on, replace the sensor. If replacement does not clear fault, consider PCM input fault and consult manufacturer service data for PCM testing and possible reprogramming or replacement.
- After repairs, clear codes, perform relearn procedures if required, and road test to confirm fault does not return.
Likely causes
- Damaged or corroded connector at the pedal/throttle assembly
- Short to constant battery voltage on the signal wire
- Failed pedal/throttle position sensor (sensor E)
- Faulty or intermittent ground or 5V reference supply from the PCM
- PCM input damaged (less likely)
Fault status
Status
PCM detected an abnormally high voltage on the Throttle/Pedal Position Sensor E circuit (P2128). MIL set; vehicle may enter reduced-power/limp mode. Inspect sensor, wiring, and PCM input circuitry.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email