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Home / DTC / P0221 — Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance

P0221 — Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance

Detailed page for trouble code P0221.

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59brands
11,914generic
22,491specific
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Code

P0221

Generic P — Powertrain

Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance

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

Causes

  • Damaged or contaminated throttle/pedal position sensor B
  • Open, shorted or corroded wiring or connector for sensor B
  • Poor 5V reference or ground to the sensor
  • Sensor B out of calibration or internal failure
  • Mechanical binding at the throttle body or pedal that causes unexpected signal
  • ECM input circuit fault or intermittent connection

Symptoms

  • Check Engine Light (MIL) on
  • Reduced engine power or limp-home mode engaged
  • Unstable idle or hesitation during throttle application
  • Poor throttle response or unexpected acceleration behavior
  • Stored freeze-frame data showing abnormal pedal/throttle values

What to check

  • Read and record freeze-frame and live data with a scan tool (throttle/pedal sensor A and B)
  • Verify DTC is current vs. pending and note driving conditions when set
  • Visually inspect sensor B connector and wiring for damage, corrosion or pinned/mis-routed harness
  • Back-probe sensor B signal, reference (5V) and ground with a digital multimeter while operating pedal/throttle
  • Perform a wiggle test on wiring while watching live data for intermittent changes
  • Compare sensor B voltage/position to sensor A across full pedal/throttle travel

Signal parameters

  • Typical reference voltage: ~5.0 V (check manufacturer spec)
  • Expected sensor output (typical): ~0.5–4.5 V across travel (varies by vehicle)
  • Sensor B output must change smoothly with pedal/throttle and correlate to sensor A (difference usually
  • No sudden jumps, drops to 0 V, or fixed rail voltages when moving throttle

Diagnostic algorithm

  1. Connect a factory-level scan tool and confirm P0221; record freeze-frame and live data for sensors A and B.
  2. Key on engine off: inspect connectors for corrosion, bent pins, moisture; repair as needed.
  3. Back-probe sensor B: verify 5V reference present, good ground, and signal voltage at rest and while moving pedal/throttle. Look for smooth change and no rail-to-rail jumps.
  4. Compare sensor B to sensor A using live data. Verify proper correlation (either both increase or one increases while the other decreases per design); note any divergence beyond spec.
  5. Perform wiggle tests along harness and connectors while monitoring live data to find intermittent shorts/opens.
  6. If wiring looks suspect, perform continuity and resistance checks from sensor pin to ECM pin; check for shorts to battery or ground.
  7. If wiring and supply are good but signal is erratic or out of range, replace sensor B and retest.
  8. If problem persists after sensor replacement and wiring checks, test ECM input circuit or consult manufacturer technical service bulletins before replacing ECM.
  9. Clear codes and perform road test to confirm repair; re-scan and verify no recurrence.

Likely causes

  • Broken or bent pin in connector to sensor B
  • Short to battery (B+) or ground in sensor B signal wire
  • Corroded connector terminals causing intermittent high resistance
  • Sensor B internal pot or Hall element failure
  • Incorrectly routed or pinched wiring harness after recent repairs
  • Faulty ECM (less common)

Fault status

⚠️ Status
MIL (Check Engine Light) illuminated. DTC P0221 stored when throttle/pedal position sensor B signal is out of expected range or fails correlation checks. May cause reduced power / limp-home mode until issue is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

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Code

P0221

GWM P — Powertrain

- Incorrect indicator / Throttle position sensor not adjusted / Switch B

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

Causes

  • Damaged or contaminated throttle/pedal position sensor B
  • Open, shorted or corroded wiring or connector for sensor B
  • Poor 5V reference or ground to the sensor
  • Sensor B out of calibration or internal failure
  • Mechanical binding at the throttle body or pedal that causes unexpected signal
  • ECM input circuit fault or intermittent connection

Symptoms

  • Check Engine Light (MIL) on
  • Reduced engine power or limp-home mode engaged
  • Unstable idle or hesitation during throttle application
  • Poor throttle response or unexpected acceleration behavior
  • Stored freeze-frame data showing abnormal pedal/throttle values

What to check

  • Read and record freeze-frame and live data with a scan tool (throttle/pedal sensor A and B)
  • Verify DTC is current vs. pending and note driving conditions when set
  • Visually inspect sensor B connector and wiring for damage, corrosion or pinned/mis-routed harness
  • Back-probe sensor B signal, reference (5V) and ground with a digital multimeter while operating pedal/throttle
  • Perform a wiggle test on wiring while watching live data for intermittent changes
  • Compare sensor B voltage/position to sensor A across full pedal/throttle travel

Signal parameters

  • Typical reference voltage: ~5.0 V (check manufacturer spec)
  • Expected sensor output (typical): ~0.5–4.5 V across travel (varies by vehicle)
  • Sensor B output must change smoothly with pedal/throttle and correlate to sensor A (difference usually
  • No sudden jumps, drops to 0 V, or fixed rail voltages when moving throttle

Diagnostic algorithm

  1. Connect a factory-level scan tool and confirm P0221; record freeze-frame and live data for sensors A and B.
  2. Key on engine off: inspect connectors for corrosion, bent pins, moisture; repair as needed.
  3. Back-probe sensor B: verify 5V reference present, good ground, and signal voltage at rest and while moving pedal/throttle. Look for smooth change and no rail-to-rail jumps.
  4. Compare sensor B to sensor A using live data. Verify proper correlation (either both increase or one increases while the other decreases per design); note any divergence beyond spec.
  5. Perform wiggle tests along harness and connectors while monitoring live data to find intermittent shorts/opens.
  6. If wiring looks suspect, perform continuity and resistance checks from sensor pin to ECM pin; check for shorts to battery or ground.
  7. If wiring and supply are good but signal is erratic or out of range, replace sensor B and retest.
  8. If problem persists after sensor replacement and wiring checks, test ECM input circuit or consult manufacturer technical service bulletins before replacing ECM.
  9. Clear codes and perform road test to confirm repair; re-scan and verify no recurrence.

Likely causes

  • Broken or bent pin in connector to sensor B
  • Short to battery (B+) or ground in sensor B signal wire
  • Corroded connector terminals causing intermittent high resistance
  • Sensor B internal pot or Hall element failure
  • Incorrectly routed or pinched wiring harness after recent repairs
  • Faulty ECM (less common)

Fault status

⚠️ Status
MIL (Check Engine Light) illuminated. DTC P0221 stored when throttle/pedal position sensor B signal is out of expected range or fails correlation checks. May cause reduced power / limp-home mode until issue is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0121 P0122 P0123 P0220 P0222 P0223
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Code

P0221

HUMMER P — Powertrain

APP (Throttle Position) Sensor 2 Circuit Performance

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

Causes

  • Damaged or contaminated throttle/pedal position sensor B
  • Open, shorted or corroded wiring or connector for sensor B
  • Poor 5V reference or ground to the sensor
  • Sensor B out of calibration or internal failure
  • Mechanical binding at the throttle body or pedal that causes unexpected signal
  • ECM input circuit fault or intermittent connection

Symptoms

  • Check Engine Light (MIL) on
  • Reduced engine power or limp-home mode engaged
  • Unstable idle or hesitation during throttle application
  • Poor throttle response or unexpected acceleration behavior
  • Stored freeze-frame data showing abnormal pedal/throttle values

What to check

  • Read and record freeze-frame and live data with a scan tool (throttle/pedal sensor A and B)
  • Verify DTC is current vs. pending and note driving conditions when set
  • Visually inspect sensor B connector and wiring for damage, corrosion or pinned/mis-routed harness
  • Back-probe sensor B signal, reference (5V) and ground with a digital multimeter while operating pedal/throttle
  • Perform a wiggle test on wiring while watching live data for intermittent changes
  • Compare sensor B voltage/position to sensor A across full pedal/throttle travel

Signal parameters

  • Typical reference voltage: ~5.0 V (check manufacturer spec)
  • Expected sensor output (typical): ~0.5–4.5 V across travel (varies by vehicle)
  • Sensor B output must change smoothly with pedal/throttle and correlate to sensor A (difference usually
  • No sudden jumps, drops to 0 V, or fixed rail voltages when moving throttle

Diagnostic algorithm

  1. Connect a factory-level scan tool and confirm P0221; record freeze-frame and live data for sensors A and B.
  2. Key on engine off: inspect connectors for corrosion, bent pins, moisture; repair as needed.
  3. Back-probe sensor B: verify 5V reference present, good ground, and signal voltage at rest and while moving pedal/throttle. Look for smooth change and no rail-to-rail jumps.
  4. Compare sensor B to sensor A using live data. Verify proper correlation (either both increase or one increases while the other decreases per design); note any divergence beyond spec.
  5. Perform wiggle tests along harness and connectors while monitoring live data to find intermittent shorts/opens.
  6. If wiring looks suspect, perform continuity and resistance checks from sensor pin to ECM pin; check for shorts to battery or ground.
  7. If wiring and supply are good but signal is erratic or out of range, replace sensor B and retest.
  8. If problem persists after sensor replacement and wiring checks, test ECM input circuit or consult manufacturer technical service bulletins before replacing ECM.
  9. Clear codes and perform road test to confirm repair; re-scan and verify no recurrence.

Likely causes

  • Broken or bent pin in connector to sensor B
  • Short to battery (B+) or ground in sensor B signal wire
  • Corroded connector terminals causing intermittent high resistance
  • Sensor B internal pot or Hall element failure
  • Incorrectly routed or pinched wiring harness after recent repairs
  • Faulty ECM (less common)

Fault status

⚠️ Status
MIL (Check Engine Light) illuminated. DTC P0221 stored when throttle/pedal position sensor B signal is out of expected range or fails correlation checks. May cause reduced power / limp-home mode until issue is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0121 P0122 P0123 P0220 P0222 P0223
Repair manuals

Manual library for HUMMER

138

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Code

P0221

LAND ROVER P — Powertrain

Throttle Position Sensor B Range/Performance

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

Causes

  • Damaged or contaminated throttle/pedal position sensor B
  • Open, shorted or corroded wiring or connector for sensor B
  • Poor 5V reference or ground to the sensor
  • Sensor B out of calibration or internal failure
  • Mechanical binding at the throttle body or pedal that causes unexpected signal
  • ECM input circuit fault or intermittent connection

Symptoms

  • Check Engine Light (MIL) on
  • Reduced engine power or limp-home mode engaged
  • Unstable idle or hesitation during throttle application
  • Poor throttle response or unexpected acceleration behavior
  • Stored freeze-frame data showing abnormal pedal/throttle values

What to check

  • Read and record freeze-frame and live data with a scan tool (throttle/pedal sensor A and B)
  • Verify DTC is current vs. pending and note driving conditions when set
  • Visually inspect sensor B connector and wiring for damage, corrosion or pinned/mis-routed harness
  • Back-probe sensor B signal, reference (5V) and ground with a digital multimeter while operating pedal/throttle
  • Perform a wiggle test on wiring while watching live data for intermittent changes
  • Compare sensor B voltage/position to sensor A across full pedal/throttle travel

Signal parameters

  • Typical reference voltage: ~5.0 V (check manufacturer spec)
  • Expected sensor output (typical): ~0.5–4.5 V across travel (varies by vehicle)
  • Sensor B output must change smoothly with pedal/throttle and correlate to sensor A (difference usually
  • No sudden jumps, drops to 0 V, or fixed rail voltages when moving throttle

Diagnostic algorithm

  1. Connect a factory-level scan tool and confirm P0221; record freeze-frame and live data for sensors A and B.
  2. Key on engine off: inspect connectors for corrosion, bent pins, moisture; repair as needed.
  3. Back-probe sensor B: verify 5V reference present, good ground, and signal voltage at rest and while moving pedal/throttle. Look for smooth change and no rail-to-rail jumps.
  4. Compare sensor B to sensor A using live data. Verify proper correlation (either both increase or one increases while the other decreases per design); note any divergence beyond spec.
  5. Perform wiggle tests along harness and connectors while monitoring live data to find intermittent shorts/opens.
  6. If wiring looks suspect, perform continuity and resistance checks from sensor pin to ECM pin; check for shorts to battery or ground.
  7. If wiring and supply are good but signal is erratic or out of range, replace sensor B and retest.
  8. If problem persists after sensor replacement and wiring checks, test ECM input circuit or consult manufacturer technical service bulletins before replacing ECM.
  9. Clear codes and perform road test to confirm repair; re-scan and verify no recurrence.

Likely causes

  • Broken or bent pin in connector to sensor B
  • Short to battery (B+) or ground in sensor B signal wire
  • Corroded connector terminals causing intermittent high resistance
  • Sensor B internal pot or Hall element failure
  • Incorrectly routed or pinched wiring harness after recent repairs
  • Faulty ECM (less common)

Fault status

⚠️ Status
MIL (Check Engine Light) illuminated. DTC P0221 stored when throttle/pedal position sensor B signal is out of expected range or fails correlation checks. May cause reduced power / limp-home mode until issue is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0121 P0122 P0123 P0220 P0222 P0223
350

Browse 350 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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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0221

MITSUBISHI P — Powertrain

APS(main) range

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

Causes

  • Damaged or contaminated throttle/pedal position sensor B
  • Open, shorted or corroded wiring or connector for sensor B
  • Poor 5V reference or ground to the sensor
  • Sensor B out of calibration or internal failure
  • Mechanical binding at the throttle body or pedal that causes unexpected signal
  • ECM input circuit fault or intermittent connection

Symptoms

  • Check Engine Light (MIL) on
  • Reduced engine power or limp-home mode engaged
  • Unstable idle or hesitation during throttle application
  • Poor throttle response or unexpected acceleration behavior
  • Stored freeze-frame data showing abnormal pedal/throttle values

What to check

  • Read and record freeze-frame and live data with a scan tool (throttle/pedal sensor A and B)
  • Verify DTC is current vs. pending and note driving conditions when set
  • Visually inspect sensor B connector and wiring for damage, corrosion or pinned/mis-routed harness
  • Back-probe sensor B signal, reference (5V) and ground with a digital multimeter while operating pedal/throttle
  • Perform a wiggle test on wiring while watching live data for intermittent changes
  • Compare sensor B voltage/position to sensor A across full pedal/throttle travel

Signal parameters

  • Typical reference voltage: ~5.0 V (check manufacturer spec)
  • Expected sensor output (typical): ~0.5–4.5 V across travel (varies by vehicle)
  • Sensor B output must change smoothly with pedal/throttle and correlate to sensor A (difference usually
  • No sudden jumps, drops to 0 V, or fixed rail voltages when moving throttle

Diagnostic algorithm

  1. Connect a factory-level scan tool and confirm P0221; record freeze-frame and live data for sensors A and B.
  2. Key on engine off: inspect connectors for corrosion, bent pins, moisture; repair as needed.
  3. Back-probe sensor B: verify 5V reference present, good ground, and signal voltage at rest and while moving pedal/throttle. Look for smooth change and no rail-to-rail jumps.
  4. Compare sensor B to sensor A using live data. Verify proper correlation (either both increase or one increases while the other decreases per design); note any divergence beyond spec.
  5. Perform wiggle tests along harness and connectors while monitoring live data to find intermittent shorts/opens.
  6. If wiring looks suspect, perform continuity and resistance checks from sensor pin to ECM pin; check for shorts to battery or ground.
  7. If wiring and supply are good but signal is erratic or out of range, replace sensor B and retest.
  8. If problem persists after sensor replacement and wiring checks, test ECM input circuit or consult manufacturer technical service bulletins before replacing ECM.
  9. Clear codes and perform road test to confirm repair; re-scan and verify no recurrence.

Likely causes

  • Broken or bent pin in connector to sensor B
  • Short to battery (B+) or ground in sensor B signal wire
  • Corroded connector terminals causing intermittent high resistance
  • Sensor B internal pot or Hall element failure
  • Incorrectly routed or pinched wiring harness after recent repairs
  • Faulty ECM (less common)

Fault status

⚠️ Status
MIL (Check Engine Light) illuminated. DTC P0221 stored when throttle/pedal position sensor B signal is out of expected range or fails correlation checks. May cause reduced power / limp-home mode until issue is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0121 P0122 P0123 P0220 P0222 P0223
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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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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