Code
P0221
Generic
P — Powertrain
Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance
Views:
UK: 26
EN: 43
RU: 33
AI status
Completed
Completed
100%
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
- Connect a factory-level scan tool and confirm P0221; record freeze-frame and live data for sensors A and B.
- Key on engine off: inspect connectors for corrosion, bent pins, moisture; repair as needed.
- 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.
- 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.
- Perform wiggle tests along harness and connectors while monitoring live data to find intermittent shorts/opens.
- If wiring looks suspect, perform continuity and resistance checks from sensor pin to ECM pin; check for shorts to battery or ground.
- If wiring and supply are good but signal is erratic or out of range, replace sensor B and retest.
- If problem persists after sensor replacement and wiring checks, test ECM input circuit or consult manufacturer technical service bulletins before replacing ECM.
- 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
Views:
UK: 2
EN: 7
RU: 5
AI status
Completed
Completed
100%
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
- Connect a factory-level scan tool and confirm P0221; record freeze-frame and live data for sensors A and B.
- Key on engine off: inspect connectors for corrosion, bent pins, moisture; repair as needed.
- 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.
- 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.
- Perform wiggle tests along harness and connectors while monitoring live data to find intermittent shorts/opens.
- If wiring looks suspect, perform continuity and resistance checks from sensor pin to ECM pin; check for shorts to battery or ground.
- If wiring and supply are good but signal is erratic or out of range, replace sensor B and retest.
- If problem persists after sensor replacement and wiring checks, test ECM input circuit or consult manufacturer technical service bulletins before replacing ECM.
- 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
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Code
P0221
HUMMER
P — Powertrain
APP (Throttle Position) Sensor 2 Circuit Performance
Views:
UK: 5
EN: 23
RU: 18
AI status
Completed
Completed
100%
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
- Connect a factory-level scan tool and confirm P0221; record freeze-frame and live data for sensors A and B.
- Key on engine off: inspect connectors for corrosion, bent pins, moisture; repair as needed.
- 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.
- 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.
- Perform wiggle tests along harness and connectors while monitoring live data to find intermittent shorts/opens.
- If wiring looks suspect, perform continuity and resistance checks from sensor pin to ECM pin; check for shorts to battery or ground.
- If wiring and supply are good but signal is erratic or out of range, replace sensor B and retest.
- If problem persists after sensor replacement and wiring checks, test ECM input circuit or consult manufacturer technical service bulletins before replacing ECM.
- 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
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0
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Code
P0221
LAND ROVER
P — Powertrain
Throttle Position Sensor B Range/Performance
Views:
UK: 5
EN: 17
RU: 14
AI status
Completed
Completed
100%
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
- Connect a factory-level scan tool and confirm P0221; record freeze-frame and live data for sensors A and B.
- Key on engine off: inspect connectors for corrosion, bent pins, moisture; repair as needed.
- 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.
- 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.
- Perform wiggle tests along harness and connectors while monitoring live data to find intermittent shorts/opens.
- If wiring looks suspect, perform continuity and resistance checks from sensor pin to ECM pin; check for shorts to battery or ground.
- If wiring and supply are good but signal is erratic or out of range, replace sensor B and retest.
- If problem persists after sensor replacement and wiring checks, test ECM input circuit or consult manufacturer technical service bulletins before replacing ECM.
- 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
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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Send to email
Code
P0221
MITSUBISHI
P — Powertrain
APS(main) range
Views:
UK: 7
EN: 19
RU: 17
AI status
Completed
Completed
100%
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
- Connect a factory-level scan tool and confirm P0221; record freeze-frame and live data for sensors A and B.
- Key on engine off: inspect connectors for corrosion, bent pins, moisture; repair as needed.
- 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.
- 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.
- Perform wiggle tests along harness and connectors while monitoring live data to find intermittent shorts/opens.
- If wiring looks suspect, perform continuity and resistance checks from sensor pin to ECM pin; check for shorts to battery or ground.
- If wiring and supply are good but signal is erratic or out of range, replace sensor B and retest.
- If problem persists after sensor replacement and wiring checks, test ECM input circuit or consult manufacturer technical service bulletins before replacing ECM.
- 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
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