Code
P0450
Generic
P — Powertrain
EVAP System Pressure Sensor/Switch A Circuit
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in EVAP pressure sensor circuit
- Corroded, loose, or damaged connector at sensor
- Failed EVAP pressure sensor/switch
- Poor or missing ground or reference voltage to sensor
- Blown fuse or power supply issue for EVAP/PCM circuits
- Intermittent wiring fault caused by chafing or water intrusion
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Failed EVAP system readiness or emissions test
- Evaporative system may not close properly, possible fuel odor in rare cases
- Generally no drivability loss — engine performance usually unaffected
- Diagnostic trouble codes present and possibly other EVAP-related codes
What to check
- Use a scan tool to read PIDs for EVAP pressure sensor value and watch for intermittent/constant faults
- Visually inspect sensor connector and wiring for corrosion, damage, loose terminals, and water intrusion
- Check for proper sensor reference voltage from PCM (commonly 5V or 3.3V) at the connector with key ON (engine OFF)
- Check sensor ground continuity to chassis/PCM ground
- Measure signal voltage from sensor while applying vacuum/pressure (or using vehicle self-test) and compare to expected change
- Check related fuses and power supplies for continuity and correct voltage
Signal parameters
- Typical EVAP pressure sensor provides a steady reference voltage (commonly 5V or 3.3V) and a signal voltage that varies with pressure (often ~0.5–4.5 V over range)
- At key ON engine OFF, signal should be stable near an expected baseline (often mid-scale near ambient pressure)
- Open circuit: signal near 0 V or circuit Open; short to voltage: signal high near reference voltage; intermittent: fluctuating signal or dropouts
Diagnostic algorithm
- Retrieve freeze frame data and related EVAP codes with a scan tool; note when code set and drive conditions. 2. Visually inspect the EVAP pressure sensor, connector, and wiring harness for obvious damage, corrosion, or disconnection. 3. With key ON (engine OFF), backprobe the sensor connector: verify reference voltage (5V or 3.3V) and good ground. If reference or ground missing, trace to fuse/PCM. 4. Measure the sensor signal voltage at key ON and while applying a known vacuum/pressure (or during vehicle EVAP self-test). Confirm signal changes smoothly and corresponds to pressure change. 5. Check continuity and resistance of wiring between sensor and PCM; repair any open/shorts found. 6. Perform a wiggle test while monitoring live PID to locate intermittent wiring faults. 7. If wiring and supplies are good, replace the EVAP pressure sensor and clear codes; perform readiness/EVAP leak test to confirm repair. 8. If fault persists after sensor replacement, test/inspect PCM input circuit and consult manufacturer technical service information before replacing PCM.
Likely causes
- Failed pressure sensor (most common)
- Connector corrosion or bent pins at sensor
- Open or short between sensor and PCM due to wiring damage
- Bad ground or missing 5V/3.3V reference supply to sensor
Fault status
Status
P0450 — EVAP System Pressure Sensor/Switch A Circuit: electrical fault detected (open/short/intermittent or out-of-range signal) in the EVAP pressure sensor circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
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Code
P0450
GWM
P — Powertrain
- Fuel Vapor Pressure Monitor Pressure Sensor Fault
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in EVAP pressure sensor circuit
- Corroded, loose, or damaged connector at sensor
- Failed EVAP pressure sensor/switch
- Poor or missing ground or reference voltage to sensor
- Blown fuse or power supply issue for EVAP/PCM circuits
- Intermittent wiring fault caused by chafing or water intrusion
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Failed EVAP system readiness or emissions test
- Evaporative system may not close properly, possible fuel odor in rare cases
- Generally no drivability loss — engine performance usually unaffected
- Diagnostic trouble codes present and possibly other EVAP-related codes
What to check
- Use a scan tool to read PIDs for EVAP pressure sensor value and watch for intermittent/constant faults
- Visually inspect sensor connector and wiring for corrosion, damage, loose terminals, and water intrusion
- Check for proper sensor reference voltage from PCM (commonly 5V or 3.3V) at the connector with key ON (engine OFF)
- Check sensor ground continuity to chassis/PCM ground
- Measure signal voltage from sensor while applying vacuum/pressure (or using vehicle self-test) and compare to expected change
- Check related fuses and power supplies for continuity and correct voltage
Signal parameters
- Typical EVAP pressure sensor provides a steady reference voltage (commonly 5V or 3.3V) and a signal voltage that varies with pressure (often ~0.5–4.5 V over range)
- At key ON engine OFF, signal should be stable near an expected baseline (often mid-scale near ambient pressure)
- Open circuit: signal near 0 V or circuit Open; short to voltage: signal high near reference voltage; intermittent: fluctuating signal or dropouts
Diagnostic algorithm
- Retrieve freeze frame data and related EVAP codes with a scan tool; note when code set and drive conditions. 2. Visually inspect the EVAP pressure sensor, connector, and wiring harness for obvious damage, corrosion, or disconnection. 3. With key ON (engine OFF), backprobe the sensor connector: verify reference voltage (5V or 3.3V) and good ground. If reference or ground missing, trace to fuse/PCM. 4. Measure the sensor signal voltage at key ON and while applying a known vacuum/pressure (or during vehicle EVAP self-test). Confirm signal changes smoothly and corresponds to pressure change. 5. Check continuity and resistance of wiring between sensor and PCM; repair any open/shorts found. 6. Perform a wiggle test while monitoring live PID to locate intermittent wiring faults. 7. If wiring and supplies are good, replace the EVAP pressure sensor and clear codes; perform readiness/EVAP leak test to confirm repair. 8. If fault persists after sensor replacement, test/inspect PCM input circuit and consult manufacturer technical service information before replacing PCM.
Likely causes
- Failed pressure sensor (most common)
- Connector corrosion or bent pins at sensor
- Open or short between sensor and PCM due to wiring damage
- Bad ground or missing 5V/3.3V reference supply to sensor
Fault status
Status
P0450 — EVAP System Pressure Sensor/Switch A Circuit: electrical fault detected (open/short/intermittent or out-of-range signal) in the EVAP pressure sensor circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P0450
HUMMER
P — Powertrain
Fuel Tank Pressure Sensor Circuit
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in EVAP pressure sensor circuit
- Corroded, loose, or damaged connector at sensor
- Failed EVAP pressure sensor/switch
- Poor or missing ground or reference voltage to sensor
- Blown fuse or power supply issue for EVAP/PCM circuits
- Intermittent wiring fault caused by chafing or water intrusion
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Failed EVAP system readiness or emissions test
- Evaporative system may not close properly, possible fuel odor in rare cases
- Generally no drivability loss — engine performance usually unaffected
- Diagnostic trouble codes present and possibly other EVAP-related codes
What to check
- Use a scan tool to read PIDs for EVAP pressure sensor value and watch for intermittent/constant faults
- Visually inspect sensor connector and wiring for corrosion, damage, loose terminals, and water intrusion
- Check for proper sensor reference voltage from PCM (commonly 5V or 3.3V) at the connector with key ON (engine OFF)
- Check sensor ground continuity to chassis/PCM ground
- Measure signal voltage from sensor while applying vacuum/pressure (or using vehicle self-test) and compare to expected change
- Check related fuses and power supplies for continuity and correct voltage
Signal parameters
- Typical EVAP pressure sensor provides a steady reference voltage (commonly 5V or 3.3V) and a signal voltage that varies with pressure (often ~0.5–4.5 V over range)
- At key ON engine OFF, signal should be stable near an expected baseline (often mid-scale near ambient pressure)
- Open circuit: signal near 0 V or circuit Open; short to voltage: signal high near reference voltage; intermittent: fluctuating signal or dropouts
Diagnostic algorithm
- Retrieve freeze frame data and related EVAP codes with a scan tool; note when code set and drive conditions. 2. Visually inspect the EVAP pressure sensor, connector, and wiring harness for obvious damage, corrosion, or disconnection. 3. With key ON (engine OFF), backprobe the sensor connector: verify reference voltage (5V or 3.3V) and good ground. If reference or ground missing, trace to fuse/PCM. 4. Measure the sensor signal voltage at key ON and while applying a known vacuum/pressure (or during vehicle EVAP self-test). Confirm signal changes smoothly and corresponds to pressure change. 5. Check continuity and resistance of wiring between sensor and PCM; repair any open/shorts found. 6. Perform a wiggle test while monitoring live PID to locate intermittent wiring faults. 7. If wiring and supplies are good, replace the EVAP pressure sensor and clear codes; perform readiness/EVAP leak test to confirm repair. 8. If fault persists after sensor replacement, test/inspect PCM input circuit and consult manufacturer technical service information before replacing PCM.
Likely causes
- Failed pressure sensor (most common)
- Connector corrosion or bent pins at sensor
- Open or short between sensor and PCM due to wiring damage
- Bad ground or missing 5V/3.3V reference supply to sensor
Fault status
Status
P0450 — EVAP System Pressure Sensor/Switch A Circuit: electrical fault detected (open/short/intermittent or out-of-range signal) in the EVAP pressure sensor circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HUMMER
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HUMMER: 2009
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HUMMER: 2008
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HUMMER: 2007
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HUMMER: 2005
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HUMMER: 2004
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HUMMER: 1994
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HUMMER: 1993
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Code
P0450
LAND ROVER
P — Powertrain
Malfunction of the pressure sensor of the evaporative emissions control system
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in EVAP pressure sensor circuit
- Corroded, loose, or damaged connector at sensor
- Failed EVAP pressure sensor/switch
- Poor or missing ground or reference voltage to sensor
- Blown fuse or power supply issue for EVAP/PCM circuits
- Intermittent wiring fault caused by chafing or water intrusion
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Failed EVAP system readiness or emissions test
- Evaporative system may not close properly, possible fuel odor in rare cases
- Generally no drivability loss — engine performance usually unaffected
- Diagnostic trouble codes present and possibly other EVAP-related codes
What to check
- Use a scan tool to read PIDs for EVAP pressure sensor value and watch for intermittent/constant faults
- Visually inspect sensor connector and wiring for corrosion, damage, loose terminals, and water intrusion
- Check for proper sensor reference voltage from PCM (commonly 5V or 3.3V) at the connector with key ON (engine OFF)
- Check sensor ground continuity to chassis/PCM ground
- Measure signal voltage from sensor while applying vacuum/pressure (or using vehicle self-test) and compare to expected change
- Check related fuses and power supplies for continuity and correct voltage
Signal parameters
- Typical EVAP pressure sensor provides a steady reference voltage (commonly 5V or 3.3V) and a signal voltage that varies with pressure (often ~0.5–4.5 V over range)
- At key ON engine OFF, signal should be stable near an expected baseline (often mid-scale near ambient pressure)
- Open circuit: signal near 0 V or circuit Open; short to voltage: signal high near reference voltage; intermittent: fluctuating signal or dropouts
Diagnostic algorithm
- Retrieve freeze frame data and related EVAP codes with a scan tool; note when code set and drive conditions. 2. Visually inspect the EVAP pressure sensor, connector, and wiring harness for obvious damage, corrosion, or disconnection. 3. With key ON (engine OFF), backprobe the sensor connector: verify reference voltage (5V or 3.3V) and good ground. If reference or ground missing, trace to fuse/PCM. 4. Measure the sensor signal voltage at key ON and while applying a known vacuum/pressure (or during vehicle EVAP self-test). Confirm signal changes smoothly and corresponds to pressure change. 5. Check continuity and resistance of wiring between sensor and PCM; repair any open/shorts found. 6. Perform a wiggle test while monitoring live PID to locate intermittent wiring faults. 7. If wiring and supplies are good, replace the EVAP pressure sensor and clear codes; perform readiness/EVAP leak test to confirm repair. 8. If fault persists after sensor replacement, test/inspect PCM input circuit and consult manufacturer technical service information before replacing PCM.
Likely causes
- Failed pressure sensor (most common)
- Connector corrosion or bent pins at sensor
- Open or short between sensor and PCM due to wiring damage
- Bad ground or missing 5V/3.3V reference supply to sensor
Fault status
Status
P0450 — EVAP System Pressure Sensor/Switch A Circuit: electrical fault detected (open/short/intermittent or out-of-range signal) in the EVAP pressure sensor circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for LAND ROVER
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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LAND ROVER: 2022
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Defender
- 90
- 90
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- 90 X
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- 90 X-Dynamic HSE
- 90 X-Dynamic HSE
- 90 X-Dynamic S
- 90 X-Dynamic S
- 90 X-Dynamic SE
- 90 X-Dynamic SE
- 110
- 110
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 V8
- 110 V8
- 110 V8 Carpathian Edition
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- 110 X
- 110 X
- 110 X-Dynamic SE
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- 110 XS Edition
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Discovery
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- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
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- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- S
- S
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Discovery Sport
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Range Rover
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
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- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- 2022 Range Rover Base
- 2022 Range Rover Base
- First Edition
- First Edition
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
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- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
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- SV
- SV
- SVAutobiography
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Range Rover Evoque
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Range Rover Velar
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- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
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-
LAND ROVER: 2021
-
Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
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- Autobiography Fifty Edition
- Autobiography Fifty Edition
- 2021 Range Rover Base
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- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- SVAutobiography
- SVAutobiography
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- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
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Range Rover Evoque
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- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- HSE Dynamic
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- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HST
- HST
- SE
- SE
- SVR
- SVR
- SVR Carbon Edition
- SVR Carbon Edition
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Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
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LAND ROVER: 2020
-
Defender
- 90 First Edition
- 90 First Edition
- 110 First Edition
- 110 First Edition
- 110 HSE
- 110 HSE
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 X
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- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
-
Discovery
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- Landmark
- Landmark
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
-
Range Rover
- Autobiography
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- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
-
Range Rover Evoque
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Range Rover Sport
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE Dynamic
- HSE Dynamic
- HSE PHEV
- HSE PHEV
- HST
- HST
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SVR
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-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- SVAutobiography Dyn.
- SVAutobiography Dyn.
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Code
P0450
MITSUBISHI
P — Powertrain
EVAP.emission pressure sensor
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in EVAP pressure sensor circuit
- Corroded, loose, or damaged connector at sensor
- Failed EVAP pressure sensor/switch
- Poor or missing ground or reference voltage to sensor
- Blown fuse or power supply issue for EVAP/PCM circuits
- Intermittent wiring fault caused by chafing or water intrusion
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Failed EVAP system readiness or emissions test
- Evaporative system may not close properly, possible fuel odor in rare cases
- Generally no drivability loss — engine performance usually unaffected
- Diagnostic trouble codes present and possibly other EVAP-related codes
What to check
- Use a scan tool to read PIDs for EVAP pressure sensor value and watch for intermittent/constant faults
- Visually inspect sensor connector and wiring for corrosion, damage, loose terminals, and water intrusion
- Check for proper sensor reference voltage from PCM (commonly 5V or 3.3V) at the connector with key ON (engine OFF)
- Check sensor ground continuity to chassis/PCM ground
- Measure signal voltage from sensor while applying vacuum/pressure (or using vehicle self-test) and compare to expected change
- Check related fuses and power supplies for continuity and correct voltage
Signal parameters
- Typical EVAP pressure sensor provides a steady reference voltage (commonly 5V or 3.3V) and a signal voltage that varies with pressure (often ~0.5–4.5 V over range)
- At key ON engine OFF, signal should be stable near an expected baseline (often mid-scale near ambient pressure)
- Open circuit: signal near 0 V or circuit Open; short to voltage: signal high near reference voltage; intermittent: fluctuating signal or dropouts
Diagnostic algorithm
- Retrieve freeze frame data and related EVAP codes with a scan tool; note when code set and drive conditions. 2. Visually inspect the EVAP pressure sensor, connector, and wiring harness for obvious damage, corrosion, or disconnection. 3. With key ON (engine OFF), backprobe the sensor connector: verify reference voltage (5V or 3.3V) and good ground. If reference or ground missing, trace to fuse/PCM. 4. Measure the sensor signal voltage at key ON and while applying a known vacuum/pressure (or during vehicle EVAP self-test). Confirm signal changes smoothly and corresponds to pressure change. 5. Check continuity and resistance of wiring between sensor and PCM; repair any open/shorts found. 6. Perform a wiggle test while monitoring live PID to locate intermittent wiring faults. 7. If wiring and supplies are good, replace the EVAP pressure sensor and clear codes; perform readiness/EVAP leak test to confirm repair. 8. If fault persists after sensor replacement, test/inspect PCM input circuit and consult manufacturer technical service information before replacing PCM.
Likely causes
- Failed pressure sensor (most common)
- Connector corrosion or bent pins at sensor
- Open or short between sensor and PCM due to wiring damage
- Bad ground or missing 5V/3.3V reference supply to sensor
Fault status
Status
P0450 — EVAP System Pressure Sensor/Switch A Circuit: electrical fault detected (open/short/intermittent or out-of-range signal) in the EVAP pressure sensor circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Repair manuals
Manual library for MITSUBISHI
406
Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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