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Home / DTC / P2127 — Throttle/Pedal Position Sensor/Switch E Circuit Low

P2127 — Throttle/Pedal Position Sensor/Switch E Circuit Low

Detailed page for trouble code P2127.

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22,491specific
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Code

P2127

Generic P — Powertrain

Throttle/Pedal Position Sensor/Switch E Circuit Low

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

Causes

  • Damaged, corroded, or loose connector at the throttle or accelerator pedal position sensor
  • Wiring shorted to ground between the sensor and PCM
  • Broken or pinched wiring causing high resistance or open circuit
  • Low or missing reference voltage from the PCM (typically a 5 V reference)
  • Poor or missing sensor ground
  • Internal failure of the throttle or pedal position sensor/switch

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced engine power or limp-home mode may be activated
  • Unstable or incorrect throttle response (hesitation, unexpected acceleration limitations)
  • Cruise control may be disabled
  • Stored trouble code(s) related to throttle/pedal position

What to check

  • Read freeze frame and stored data with a scan tool to capture operating conditions when the code set
  • Visually inspect connectors and wiring for damage, corrosion, and secure fit at sensor and PCM
  • Backprobe the sensor connector to measure signal, reference, and ground voltages with key on engine off (KOEO) and with accelerator pedal moved
  • Check for continuity to chassis ground and for short to ground between the signal wire and ground
  • Wiggle test the wiring harness while monitoring live data to look for intermittent changes
  • Compare live sensor voltage to expected values while moving the pedal or throttle

Signal parameters

  • Reference (Vref) typically ~5.0 V from PCM (measure with key on)
  • Sensor signal voltage nominally varies ~0.5–4.5 V across travel (manufacturer-specific)
  • Low threshold: signal < ~0.2–0.3 V is considered low/fault (may vary by OEM)
  • High threshold: signal > ~4.8–5.0 V indicates high/fault (for reference only)
  • Expected circuit continuity from sensor signal pin to PCM signal pin: near 0 ohms (check for open/high resistance)
  • Sensor ground continuity to chassis/PCM ground: near 0 ohms

Diagnostic algorithm

  1. Retrieve and record all stored codes and freeze-frame data with a scan tool; note battery voltage and engine state.
  2. Visually inspect the throttle/pedal sensor connector and wiring for damage, corrosion, pin push-out, or bent pins.
  3. With key ON (engine off), backprobe: verify Vref (≈5 V) at sensor connector, sensor ground, and sensor signal voltage. Record values at rest and while moving pedal/throttle.
  4. If Vref is missing, check PCM fuse(s) and wiring for supply to PCM; verify PCM output on reference circuit.
  5. If Vref present but signal is low, inspect for short to ground: disconnect sensor and measure resistance between signal wire and ground; a short will show near 0 ohms.
  6. Perform continuity check between sensor signal pin and PCM signal pin; repair any opens or high-resistance wiring.
  7. Perform wiggle test of harness between sensor and PCM while monitoring live signal voltage for intermittent faults.
  8. If wiring and connectors check good, compare sensor resistance (if applicable) to manufacturer specification or substitute known-good sensor to confirm.
  9. After repairs or component replacement, clear codes, perform key-on and run tests, then road test to verify the code does not return.
  10. If code persists despite good wiring and correct voltages, consider PCM input fault — consult OEM procedures before replacement.

Likely causes

  • Corroded/loose connector at the sensor
  • Short to ground in the sensor signal wire
  • Failed throttle/pedal position sensor

Fault status

⚠️ Status
PCM detected low voltage on the Throttle/Pedal Position Sensor/Switch E circuit (signal below minimum threshold).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0120 P0121 P0122 P0123 P0124 P2123
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Code

P2127

HUMMER P — Powertrain

Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

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

Causes

  • Damaged, corroded, or loose connector at the throttle or accelerator pedal position sensor
  • Wiring shorted to ground between the sensor and PCM
  • Broken or pinched wiring causing high resistance or open circuit
  • Low or missing reference voltage from the PCM (typically a 5 V reference)
  • Poor or missing sensor ground
  • Internal failure of the throttle or pedal position sensor/switch

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced engine power or limp-home mode may be activated
  • Unstable or incorrect throttle response (hesitation, unexpected acceleration limitations)
  • Cruise control may be disabled
  • Stored trouble code(s) related to throttle/pedal position

What to check

  • Read freeze frame and stored data with a scan tool to capture operating conditions when the code set
  • Visually inspect connectors and wiring for damage, corrosion, and secure fit at sensor and PCM
  • Backprobe the sensor connector to measure signal, reference, and ground voltages with key on engine off (KOEO) and with accelerator pedal moved
  • Check for continuity to chassis ground and for short to ground between the signal wire and ground
  • Wiggle test the wiring harness while monitoring live data to look for intermittent changes
  • Compare live sensor voltage to expected values while moving the pedal or throttle

Signal parameters

  • Reference (Vref) typically ~5.0 V from PCM (measure with key on)
  • Sensor signal voltage nominally varies ~0.5–4.5 V across travel (manufacturer-specific)
  • Low threshold: signal < ~0.2–0.3 V is considered low/fault (may vary by OEM)
  • High threshold: signal > ~4.8–5.0 V indicates high/fault (for reference only)
  • Expected circuit continuity from sensor signal pin to PCM signal pin: near 0 ohms (check for open/high resistance)
  • Sensor ground continuity to chassis/PCM ground: near 0 ohms

Diagnostic algorithm

  1. Retrieve and record all stored codes and freeze-frame data with a scan tool; note battery voltage and engine state.
  2. Visually inspect the throttle/pedal sensor connector and wiring for damage, corrosion, pin push-out, or bent pins.
  3. With key ON (engine off), backprobe: verify Vref (≈5 V) at sensor connector, sensor ground, and sensor signal voltage. Record values at rest and while moving pedal/throttle.
  4. If Vref is missing, check PCM fuse(s) and wiring for supply to PCM; verify PCM output on reference circuit.
  5. If Vref present but signal is low, inspect for short to ground: disconnect sensor and measure resistance between signal wire and ground; a short will show near 0 ohms.
  6. Perform continuity check between sensor signal pin and PCM signal pin; repair any opens or high-resistance wiring.
  7. Perform wiggle test of harness between sensor and PCM while monitoring live signal voltage for intermittent faults.
  8. If wiring and connectors check good, compare sensor resistance (if applicable) to manufacturer specification or substitute known-good sensor to confirm.
  9. After repairs or component replacement, clear codes, perform key-on and run tests, then road test to verify the code does not return.
  10. If code persists despite good wiring and correct voltages, consider PCM input fault — consult OEM procedures before replacement.

Likely causes

  • Corroded/loose connector at the sensor
  • Short to ground in the sensor signal wire
  • Failed throttle/pedal position sensor

Fault status

⚠️ Status
PCM detected low voltage on the Throttle/Pedal Position Sensor/Switch E circuit (signal below minimum threshold).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0120 P0121 P0122 P0123 P0124 P2123
Repair manuals

Manual library for HUMMER

138

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Code

P2127

ISUZU P — Powertrain

Pedal Position Sensor 2 Circuit Low Input

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

Causes

  • Damaged, corroded, or loose connector at the throttle or accelerator pedal position sensor
  • Wiring shorted to ground between the sensor and PCM
  • Broken or pinched wiring causing high resistance or open circuit
  • Low or missing reference voltage from the PCM (typically a 5 V reference)
  • Poor or missing sensor ground
  • Internal failure of the throttle or pedal position sensor/switch

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced engine power or limp-home mode may be activated
  • Unstable or incorrect throttle response (hesitation, unexpected acceleration limitations)
  • Cruise control may be disabled
  • Stored trouble code(s) related to throttle/pedal position

What to check

  • Read freeze frame and stored data with a scan tool to capture operating conditions when the code set
  • Visually inspect connectors and wiring for damage, corrosion, and secure fit at sensor and PCM
  • Backprobe the sensor connector to measure signal, reference, and ground voltages with key on engine off (KOEO) and with accelerator pedal moved
  • Check for continuity to chassis ground and for short to ground between the signal wire and ground
  • Wiggle test the wiring harness while monitoring live data to look for intermittent changes
  • Compare live sensor voltage to expected values while moving the pedal or throttle

Signal parameters

  • Reference (Vref) typically ~5.0 V from PCM (measure with key on)
  • Sensor signal voltage nominally varies ~0.5–4.5 V across travel (manufacturer-specific)
  • Low threshold: signal < ~0.2–0.3 V is considered low/fault (may vary by OEM)
  • High threshold: signal > ~4.8–5.0 V indicates high/fault (for reference only)
  • Expected circuit continuity from sensor signal pin to PCM signal pin: near 0 ohms (check for open/high resistance)
  • Sensor ground continuity to chassis/PCM ground: near 0 ohms

Diagnostic algorithm

  1. Retrieve and record all stored codes and freeze-frame data with a scan tool; note battery voltage and engine state.
  2. Visually inspect the throttle/pedal sensor connector and wiring for damage, corrosion, pin push-out, or bent pins.
  3. With key ON (engine off), backprobe: verify Vref (≈5 V) at sensor connector, sensor ground, and sensor signal voltage. Record values at rest and while moving pedal/throttle.
  4. If Vref is missing, check PCM fuse(s) and wiring for supply to PCM; verify PCM output on reference circuit.
  5. If Vref present but signal is low, inspect for short to ground: disconnect sensor and measure resistance between signal wire and ground; a short will show near 0 ohms.
  6. Perform continuity check between sensor signal pin and PCM signal pin; repair any opens or high-resistance wiring.
  7. Perform wiggle test of harness between sensor and PCM while monitoring live signal voltage for intermittent faults.
  8. If wiring and connectors check good, compare sensor resistance (if applicable) to manufacturer specification or substitute known-good sensor to confirm.
  9. After repairs or component replacement, clear codes, perform key-on and run tests, then road test to verify the code does not return.
  10. If code persists despite good wiring and correct voltages, consider PCM input fault — consult OEM procedures before replacement.

Likely causes

  • Corroded/loose connector at the sensor
  • Short to ground in the sensor signal wire
  • Failed throttle/pedal position sensor

Fault status

⚠️ Status
PCM detected low voltage on the Throttle/Pedal Position Sensor/Switch E circuit (signal below minimum threshold).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0120 P0121 P0122 P0123 P0124 P2123
Repair manuals

Manual library for ISUZU

86

Browse 86 ISUZU manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

P2127

LAND ROVER P — Powertrain

Throttle position sensor/pedal/switch E circuit low input

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

Causes

  • Damaged, corroded, or loose connector at the throttle or accelerator pedal position sensor
  • Wiring shorted to ground between the sensor and PCM
  • Broken or pinched wiring causing high resistance or open circuit
  • Low or missing reference voltage from the PCM (typically a 5 V reference)
  • Poor or missing sensor ground
  • Internal failure of the throttle or pedal position sensor/switch

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced engine power or limp-home mode may be activated
  • Unstable or incorrect throttle response (hesitation, unexpected acceleration limitations)
  • Cruise control may be disabled
  • Stored trouble code(s) related to throttle/pedal position

What to check

  • Read freeze frame and stored data with a scan tool to capture operating conditions when the code set
  • Visually inspect connectors and wiring for damage, corrosion, and secure fit at sensor and PCM
  • Backprobe the sensor connector to measure signal, reference, and ground voltages with key on engine off (KOEO) and with accelerator pedal moved
  • Check for continuity to chassis ground and for short to ground between the signal wire and ground
  • Wiggle test the wiring harness while monitoring live data to look for intermittent changes
  • Compare live sensor voltage to expected values while moving the pedal or throttle

Signal parameters

  • Reference (Vref) typically ~5.0 V from PCM (measure with key on)
  • Sensor signal voltage nominally varies ~0.5–4.5 V across travel (manufacturer-specific)
  • Low threshold: signal < ~0.2–0.3 V is considered low/fault (may vary by OEM)
  • High threshold: signal > ~4.8–5.0 V indicates high/fault (for reference only)
  • Expected circuit continuity from sensor signal pin to PCM signal pin: near 0 ohms (check for open/high resistance)
  • Sensor ground continuity to chassis/PCM ground: near 0 ohms

Diagnostic algorithm

  1. Retrieve and record all stored codes and freeze-frame data with a scan tool; note battery voltage and engine state.
  2. Visually inspect the throttle/pedal sensor connector and wiring for damage, corrosion, pin push-out, or bent pins.
  3. With key ON (engine off), backprobe: verify Vref (≈5 V) at sensor connector, sensor ground, and sensor signal voltage. Record values at rest and while moving pedal/throttle.
  4. If Vref is missing, check PCM fuse(s) and wiring for supply to PCM; verify PCM output on reference circuit.
  5. If Vref present but signal is low, inspect for short to ground: disconnect sensor and measure resistance between signal wire and ground; a short will show near 0 ohms.
  6. Perform continuity check between sensor signal pin and PCM signal pin; repair any opens or high-resistance wiring.
  7. Perform wiggle test of harness between sensor and PCM while monitoring live signal voltage for intermittent faults.
  8. If wiring and connectors check good, compare sensor resistance (if applicable) to manufacturer specification or substitute known-good sensor to confirm.
  9. After repairs or component replacement, clear codes, perform key-on and run tests, then road test to verify the code does not return.
  10. If code persists despite good wiring and correct voltages, consider PCM input fault — consult OEM procedures before replacement.

Likely causes

  • Corroded/loose connector at the sensor
  • Short to ground in the sensor signal wire
  • Failed throttle/pedal position sensor

Fault status

⚠️ Status
PCM detected low voltage on the Throttle/Pedal Position Sensor/Switch E circuit (signal below minimum threshold).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0120 P0121 P0122 P0123 P0124 P2123
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

P2127

MITSUBISHI P — Powertrain

APS(sub) low

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

Causes

  • Damaged, corroded, or loose connector at the throttle or accelerator pedal position sensor
  • Wiring shorted to ground between the sensor and PCM
  • Broken or pinched wiring causing high resistance or open circuit
  • Low or missing reference voltage from the PCM (typically a 5 V reference)
  • Poor or missing sensor ground
  • Internal failure of the throttle or pedal position sensor/switch

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced engine power or limp-home mode may be activated
  • Unstable or incorrect throttle response (hesitation, unexpected acceleration limitations)
  • Cruise control may be disabled
  • Stored trouble code(s) related to throttle/pedal position

What to check

  • Read freeze frame and stored data with a scan tool to capture operating conditions when the code set
  • Visually inspect connectors and wiring for damage, corrosion, and secure fit at sensor and PCM
  • Backprobe the sensor connector to measure signal, reference, and ground voltages with key on engine off (KOEO) and with accelerator pedal moved
  • Check for continuity to chassis ground and for short to ground between the signal wire and ground
  • Wiggle test the wiring harness while monitoring live data to look for intermittent changes
  • Compare live sensor voltage to expected values while moving the pedal or throttle

Signal parameters

  • Reference (Vref) typically ~5.0 V from PCM (measure with key on)
  • Sensor signal voltage nominally varies ~0.5–4.5 V across travel (manufacturer-specific)
  • Low threshold: signal < ~0.2–0.3 V is considered low/fault (may vary by OEM)
  • High threshold: signal > ~4.8–5.0 V indicates high/fault (for reference only)
  • Expected circuit continuity from sensor signal pin to PCM signal pin: near 0 ohms (check for open/high resistance)
  • Sensor ground continuity to chassis/PCM ground: near 0 ohms

Diagnostic algorithm

  1. Retrieve and record all stored codes and freeze-frame data with a scan tool; note battery voltage and engine state.
  2. Visually inspect the throttle/pedal sensor connector and wiring for damage, corrosion, pin push-out, or bent pins.
  3. With key ON (engine off), backprobe: verify Vref (≈5 V) at sensor connector, sensor ground, and sensor signal voltage. Record values at rest and while moving pedal/throttle.
  4. If Vref is missing, check PCM fuse(s) and wiring for supply to PCM; verify PCM output on reference circuit.
  5. If Vref present but signal is low, inspect for short to ground: disconnect sensor and measure resistance between signal wire and ground; a short will show near 0 ohms.
  6. Perform continuity check between sensor signal pin and PCM signal pin; repair any opens or high-resistance wiring.
  7. Perform wiggle test of harness between sensor and PCM while monitoring live signal voltage for intermittent faults.
  8. If wiring and connectors check good, compare sensor resistance (if applicable) to manufacturer specification or substitute known-good sensor to confirm.
  9. After repairs or component replacement, clear codes, perform key-on and run tests, then road test to verify the code does not return.
  10. If code persists despite good wiring and correct voltages, consider PCM input fault — consult OEM procedures before replacement.

Likely causes

  • Corroded/loose connector at the sensor
  • Short to ground in the sensor signal wire
  • Failed throttle/pedal position sensor

Fault status

⚠️ Status
PCM detected low voltage on the Throttle/Pedal Position Sensor/Switch E circuit (signal below minimum threshold).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0120 P0121 P0122 P0123 P0124 P2123
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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