Code
P0453
Generic
P — Powertrain
EVAP System Pressure Sensor/Switch A Circuit High
AI status
Completed
Completed
100%
Causes
- Open, damaged or shorted wiring/connector on EVAP pressure sensor signal circuit
- Short to battery/ignition voltage on the sensor signal
- Poor or missing ground or reference voltage to the sensor
- Faulty EVAP pressure sensor (internal shorted output)
- PCM input/driver fault (rare)
- Intermittent connector corrosion or water intrusion
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Failed/poor emissions readiness or failed emissions test
- EVAP system leak detection disabled or incorrect operation
- Usually no drivability problems; fuel odor possible if EVAP malfunction present
What to check
- Read freeze frame and live data with a scan tool; note sensor voltage/value and related EVAP/Purge codes
- Visual inspection of EVAP pressure sensor, connector, and wiring harness for damage, corrosion, or pin pushed out
- Backprobe sensor: check reference voltage (typically ~5 V), signal voltage and ground with key ON (engine OFF) and engine running
- Check continuity and for shorts: signal-to-VB, signal-to-ground, and signal-to-PCM pin
- Wiggle harness while watching live data to detect intermittent faults
- Disconnect sensor and observe scanner: some controllers will report open/low — follow OEM procedure
Signal parameters
- Reference voltage: approx. 5.0 V (commonly 4.8–5.2 V) on the sensor Vref pin
- Signal voltage: typically an analog output in the range ~0.5–4.5 V corresponding to pressure; high-circuit fault occurs when signal exceeds upper threshold (often >4.8 V)
- Ground: near 0 V
- Sensor is an analog voltage type (no PWM) on most vehicles; consult OEM values for exact ranges
Diagnostic algorithm
- Use a scan tool to confirm P0453, note freeze-frame data and check for related EVAP codes (P0440, P0452, etc.).
- Perform a visual inspection of the EVAP pressure sensor, connector, and wiring harness for damage, chafing, pin corrosion or water intrusion.
- Backprobe the sensor connector. With key ON (engine OFF) verify Vref (~5 V), signal voltage, and ground continuity to chassis.
- If signal voltage is above expected with key ON, check for a short to VB: measure resistance between signal wire and battery + (with power off). Low resistance indicates a short.
- If Vref is incorrect or missing, trace and repair the reference supply; check PCM fuse/relays if applicable.
- If wiring checks good but signal remains high, disconnect the sensor and monitor scanner — if voltage goes to an expected open/idle value, suspect the sensor. If signal still high with sensor disconnected, suspect a wiring short or PCM.
- Wiggle test wiring with connector connected while watching live data to find intermittent faults.
- Replace the EVAP pressure sensor if testing shows internal failure or if swapping with a known-good unit resolves the issue.
- After repair, clear codes, perform readiness drive cycle and verify the code does not return and EVAP data is within expected ranges.
Likely causes
- Shorted signal wire to VB (battery/ignition feed)
- Failed EVAP pressure sensor producing high output voltage
- Corroded or loose sensor connector causing erratic/high readings
- Missing/incorrect sensor ground or reference voltage
- PCM high-side input fault (if wiring and sensor check good)
Fault status
Status
EVAP System Pressure Sensor/Switch A Circuit High — PCM detected a voltage on the EVAP pressure sensor signal circuit that is higher than the allowed threshold. Inspection of sensor, wiring, and reference/ground circuits is required.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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Code
P0453
GWM
P — Powertrain
- High fuel pressure sensor monitoring system pressure gauge
AI status
Completed
Completed
100%
Causes
- Open, damaged or shorted wiring/connector on EVAP pressure sensor signal circuit
- Short to battery/ignition voltage on the sensor signal
- Poor or missing ground or reference voltage to the sensor
- Faulty EVAP pressure sensor (internal shorted output)
- PCM input/driver fault (rare)
- Intermittent connector corrosion or water intrusion
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Failed/poor emissions readiness or failed emissions test
- EVAP system leak detection disabled or incorrect operation
- Usually no drivability problems; fuel odor possible if EVAP malfunction present
What to check
- Read freeze frame and live data with a scan tool; note sensor voltage/value and related EVAP/Purge codes
- Visual inspection of EVAP pressure sensor, connector, and wiring harness for damage, corrosion, or pin pushed out
- Backprobe sensor: check reference voltage (typically ~5 V), signal voltage and ground with key ON (engine OFF) and engine running
- Check continuity and for shorts: signal-to-VB, signal-to-ground, and signal-to-PCM pin
- Wiggle harness while watching live data to detect intermittent faults
- Disconnect sensor and observe scanner: some controllers will report open/low — follow OEM procedure
Signal parameters
- Reference voltage: approx. 5.0 V (commonly 4.8–5.2 V) on the sensor Vref pin
- Signal voltage: typically an analog output in the range ~0.5–4.5 V corresponding to pressure; high-circuit fault occurs when signal exceeds upper threshold (often >4.8 V)
- Ground: near 0 V
- Sensor is an analog voltage type (no PWM) on most vehicles; consult OEM values for exact ranges
Diagnostic algorithm
- Use a scan tool to confirm P0453, note freeze-frame data and check for related EVAP codes (P0440, P0452, etc.).
- Perform a visual inspection of the EVAP pressure sensor, connector, and wiring harness for damage, chafing, pin corrosion or water intrusion.
- Backprobe the sensor connector. With key ON (engine OFF) verify Vref (~5 V), signal voltage, and ground continuity to chassis.
- If signal voltage is above expected with key ON, check for a short to VB: measure resistance between signal wire and battery + (with power off). Low resistance indicates a short.
- If Vref is incorrect or missing, trace and repair the reference supply; check PCM fuse/relays if applicable.
- If wiring checks good but signal remains high, disconnect the sensor and monitor scanner — if voltage goes to an expected open/idle value, suspect the sensor. If signal still high with sensor disconnected, suspect a wiring short or PCM.
- Wiggle test wiring with connector connected while watching live data to find intermittent faults.
- Replace the EVAP pressure sensor if testing shows internal failure or if swapping with a known-good unit resolves the issue.
- After repair, clear codes, perform readiness drive cycle and verify the code does not return and EVAP data is within expected ranges.
Likely causes
- Shorted signal wire to VB (battery/ignition feed)
- Failed EVAP pressure sensor producing high output voltage
- Corroded or loose sensor connector causing erratic/high readings
- Missing/incorrect sensor ground or reference voltage
- PCM high-side input fault (if wiring and sensor check good)
Fault status
Status
EVAP System Pressure Sensor/Switch A Circuit High — PCM detected a voltage on the EVAP pressure sensor signal circuit that is higher than the allowed threshold. Inspection of sensor, wiring, and reference/ground circuits is required.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Similar codes
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Code
P0453
HUMMER
P — Powertrain
Fuel Tank Pressure Sensor Circuit High Voltage
AI status
Completed
Completed
100%
Causes
- Open, damaged or shorted wiring/connector on EVAP pressure sensor signal circuit
- Short to battery/ignition voltage on the sensor signal
- Poor or missing ground or reference voltage to the sensor
- Faulty EVAP pressure sensor (internal shorted output)
- PCM input/driver fault (rare)
- Intermittent connector corrosion or water intrusion
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Failed/poor emissions readiness or failed emissions test
- EVAP system leak detection disabled or incorrect operation
- Usually no drivability problems; fuel odor possible if EVAP malfunction present
What to check
- Read freeze frame and live data with a scan tool; note sensor voltage/value and related EVAP/Purge codes
- Visual inspection of EVAP pressure sensor, connector, and wiring harness for damage, corrosion, or pin pushed out
- Backprobe sensor: check reference voltage (typically ~5 V), signal voltage and ground with key ON (engine OFF) and engine running
- Check continuity and for shorts: signal-to-VB, signal-to-ground, and signal-to-PCM pin
- Wiggle harness while watching live data to detect intermittent faults
- Disconnect sensor and observe scanner: some controllers will report open/low — follow OEM procedure
Signal parameters
- Reference voltage: approx. 5.0 V (commonly 4.8–5.2 V) on the sensor Vref pin
- Signal voltage: typically an analog output in the range ~0.5–4.5 V corresponding to pressure; high-circuit fault occurs when signal exceeds upper threshold (often >4.8 V)
- Ground: near 0 V
- Sensor is an analog voltage type (no PWM) on most vehicles; consult OEM values for exact ranges
Diagnostic algorithm
- Use a scan tool to confirm P0453, note freeze-frame data and check for related EVAP codes (P0440, P0452, etc.).
- Perform a visual inspection of the EVAP pressure sensor, connector, and wiring harness for damage, chafing, pin corrosion or water intrusion.
- Backprobe the sensor connector. With key ON (engine OFF) verify Vref (~5 V), signal voltage, and ground continuity to chassis.
- If signal voltage is above expected with key ON, check for a short to VB: measure resistance between signal wire and battery + (with power off). Low resistance indicates a short.
- If Vref is incorrect or missing, trace and repair the reference supply; check PCM fuse/relays if applicable.
- If wiring checks good but signal remains high, disconnect the sensor and monitor scanner — if voltage goes to an expected open/idle value, suspect the sensor. If signal still high with sensor disconnected, suspect a wiring short or PCM.
- Wiggle test wiring with connector connected while watching live data to find intermittent faults.
- Replace the EVAP pressure sensor if testing shows internal failure or if swapping with a known-good unit resolves the issue.
- After repair, clear codes, perform readiness drive cycle and verify the code does not return and EVAP data is within expected ranges.
Likely causes
- Shorted signal wire to VB (battery/ignition feed)
- Failed EVAP pressure sensor producing high output voltage
- Corroded or loose sensor connector causing erratic/high readings
- Missing/incorrect sensor ground or reference voltage
- PCM high-side input fault (if wiring and sensor check good)
Fault status
Status
EVAP System Pressure Sensor/Switch A Circuit High — PCM detected a voltage on the EVAP pressure sensor signal circuit that is higher than the allowed threshold. Inspection of sensor, wiring, and reference/ground circuits is required.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 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.
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Code
P0453
LAND ROVER
P — Powertrain
High input from the emission control system pressure sensor evaporative
AI status
Completed
Completed
100%
Causes
- Open, damaged or shorted wiring/connector on EVAP pressure sensor signal circuit
- Short to battery/ignition voltage on the sensor signal
- Poor or missing ground or reference voltage to the sensor
- Faulty EVAP pressure sensor (internal shorted output)
- PCM input/driver fault (rare)
- Intermittent connector corrosion or water intrusion
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Failed/poor emissions readiness or failed emissions test
- EVAP system leak detection disabled or incorrect operation
- Usually no drivability problems; fuel odor possible if EVAP malfunction present
What to check
- Read freeze frame and live data with a scan tool; note sensor voltage/value and related EVAP/Purge codes
- Visual inspection of EVAP pressure sensor, connector, and wiring harness for damage, corrosion, or pin pushed out
- Backprobe sensor: check reference voltage (typically ~5 V), signal voltage and ground with key ON (engine OFF) and engine running
- Check continuity and for shorts: signal-to-VB, signal-to-ground, and signal-to-PCM pin
- Wiggle harness while watching live data to detect intermittent faults
- Disconnect sensor and observe scanner: some controllers will report open/low — follow OEM procedure
Signal parameters
- Reference voltage: approx. 5.0 V (commonly 4.8–5.2 V) on the sensor Vref pin
- Signal voltage: typically an analog output in the range ~0.5–4.5 V corresponding to pressure; high-circuit fault occurs when signal exceeds upper threshold (often >4.8 V)
- Ground: near 0 V
- Sensor is an analog voltage type (no PWM) on most vehicles; consult OEM values for exact ranges
Diagnostic algorithm
- Use a scan tool to confirm P0453, note freeze-frame data and check for related EVAP codes (P0440, P0452, etc.).
- Perform a visual inspection of the EVAP pressure sensor, connector, and wiring harness for damage, chafing, pin corrosion or water intrusion.
- Backprobe the sensor connector. With key ON (engine OFF) verify Vref (~5 V), signal voltage, and ground continuity to chassis.
- If signal voltage is above expected with key ON, check for a short to VB: measure resistance between signal wire and battery + (with power off). Low resistance indicates a short.
- If Vref is incorrect or missing, trace and repair the reference supply; check PCM fuse/relays if applicable.
- If wiring checks good but signal remains high, disconnect the sensor and monitor scanner — if voltage goes to an expected open/idle value, suspect the sensor. If signal still high with sensor disconnected, suspect a wiring short or PCM.
- Wiggle test wiring with connector connected while watching live data to find intermittent faults.
- Replace the EVAP pressure sensor if testing shows internal failure or if swapping with a known-good unit resolves the issue.
- After repair, clear codes, perform readiness drive cycle and verify the code does not return and EVAP data is within expected ranges.
Likely causes
- Shorted signal wire to VB (battery/ignition feed)
- Failed EVAP pressure sensor producing high output voltage
- Corroded or loose sensor connector causing erratic/high readings
- Missing/incorrect sensor ground or reference voltage
- PCM high-side input fault (if wiring and sensor check good)
Fault status
Status
EVAP System Pressure Sensor/Switch A Circuit High — PCM detected a voltage on the EVAP pressure sensor signal circuit that is higher than the allowed threshold. Inspection of sensor, wiring, and reference/ground circuits is required.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 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
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- 90 X-Dynamic SE
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- 110
- 110
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- 110 V8
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- 110 V8 Carpathian Edition
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- 110 X
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- 110 X-Dynamic SE
- 110 X-Dynamic SE
- 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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- 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
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- 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
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- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
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- SVAutobiography
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Range Rover Evoque
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Range Rover Velar
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- 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
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Discovery Sport
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Range Rover
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- Autobiography Fifty Edition
- Autobiography Fifty Edition
- 2021 Range Rover Base
- 2021 Range Rover Base
- 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
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- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
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- 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
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
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Range Rover Evoque
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Range Rover Sport
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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
-
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
- 110 X
- 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
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- 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
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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
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- HSE PHEV
- HSE PHEV
- HST
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Code
P0453
MITSUBISHI
P — Powertrain
EVAP.emission PRS.sensor high
AI status
Completed
Completed
100%
Causes
- Open, damaged or shorted wiring/connector on EVAP pressure sensor signal circuit
- Short to battery/ignition voltage on the sensor signal
- Poor or missing ground or reference voltage to the sensor
- Faulty EVAP pressure sensor (internal shorted output)
- PCM input/driver fault (rare)
- Intermittent connector corrosion or water intrusion
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Failed/poor emissions readiness or failed emissions test
- EVAP system leak detection disabled or incorrect operation
- Usually no drivability problems; fuel odor possible if EVAP malfunction present
What to check
- Read freeze frame and live data with a scan tool; note sensor voltage/value and related EVAP/Purge codes
- Visual inspection of EVAP pressure sensor, connector, and wiring harness for damage, corrosion, or pin pushed out
- Backprobe sensor: check reference voltage (typically ~5 V), signal voltage and ground with key ON (engine OFF) and engine running
- Check continuity and for shorts: signal-to-VB, signal-to-ground, and signal-to-PCM pin
- Wiggle harness while watching live data to detect intermittent faults
- Disconnect sensor and observe scanner: some controllers will report open/low — follow OEM procedure
Signal parameters
- Reference voltage: approx. 5.0 V (commonly 4.8–5.2 V) on the sensor Vref pin
- Signal voltage: typically an analog output in the range ~0.5–4.5 V corresponding to pressure; high-circuit fault occurs when signal exceeds upper threshold (often >4.8 V)
- Ground: near 0 V
- Sensor is an analog voltage type (no PWM) on most vehicles; consult OEM values for exact ranges
Diagnostic algorithm
- Use a scan tool to confirm P0453, note freeze-frame data and check for related EVAP codes (P0440, P0452, etc.).
- Perform a visual inspection of the EVAP pressure sensor, connector, and wiring harness for damage, chafing, pin corrosion or water intrusion.
- Backprobe the sensor connector. With key ON (engine OFF) verify Vref (~5 V), signal voltage, and ground continuity to chassis.
- If signal voltage is above expected with key ON, check for a short to VB: measure resistance between signal wire and battery + (with power off). Low resistance indicates a short.
- If Vref is incorrect or missing, trace and repair the reference supply; check PCM fuse/relays if applicable.
- If wiring checks good but signal remains high, disconnect the sensor and monitor scanner — if voltage goes to an expected open/idle value, suspect the sensor. If signal still high with sensor disconnected, suspect a wiring short or PCM.
- Wiggle test wiring with connector connected while watching live data to find intermittent faults.
- Replace the EVAP pressure sensor if testing shows internal failure or if swapping with a known-good unit resolves the issue.
- After repair, clear codes, perform readiness drive cycle and verify the code does not return and EVAP data is within expected ranges.
Likely causes
- Shorted signal wire to VB (battery/ignition feed)
- Failed EVAP pressure sensor producing high output voltage
- Corroded or loose sensor connector causing erratic/high readings
- Missing/incorrect sensor ground or reference voltage
- PCM high-side input fault (if wiring and sensor check good)
Fault status
Status
EVAP System Pressure Sensor/Switch A Circuit High — PCM detected a voltage on the EVAP pressure sensor signal circuit that is higher than the allowed threshold. Inspection of sensor, wiring, and reference/ground circuits is required.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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