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Home / DTC / P2455 — Particulate Filter Pressure Sensor A Circuit High

P2455 — Particulate Filter Pressure Sensor A Circuit High

Detailed page for trouble code P2455.

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22,491specific
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P2455

Generic P — Powertrain

Particulate Filter Pressure Sensor A Circuit High

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

Causes

  • Open or shorted wiring in the DPF pressure sensor signal, power, or ground circuit
  • Corroded, loose, or damaged connector at the pressure sensor or ECM
  • Faulty particulate filter pressure sensor (internal failure)
  • Blocked, restricted, or severely clogged diesel particulate filter causing excessive pressure
  • Exhaust leaks or cross-contamination affecting sensor readings
  • Faulty ECM or poor ECM input circuitry (rare)

Symptoms

  • Check Engine Light / MIL illuminated
  • Reduced engine performance or limited power (on some vehicles)
  • Frequent DPF regeneration attempts or inability to complete regeneration
  • Poor fuel economy
  • Failed emissions test or visible smoke if filter compromised

What to check

  • Read freeze frame and live data for pressure sensor signal and related parameters (engine speed, load, exhaust temp, DPF differential)
  • Inspect sensor connector and wiring for corrosion, pin damage, loose terminals, or crushed wires
  • Measure sensor supply (reference) voltage and ground at the connector (typically 5 V reference and good ground)
  • Check sensor output voltage with key on & engine running; compare to expected idle and load values
  • Perform continuity and resistance checks from sensor connector to ECM to find opens/shorts
  • Inspect exhaust system and DPF for restrictions, soot buildup, or leaks upstream/downstream of the sensor

Signal parameters

  • Typical pressure sensor reference: 5 V (verify vehicle-specific value)
  • Expected sensor output range: approximately 0.5–4.5 V (vehicle-dependent); P2455 indicates signal above upper threshold
  • Differential pressure typical range: near 0–50 mbar (0–5 kPa) at idle, rising under load; exact values depend on engine and DPF design
  • High signal may be >4.5 V or an open-circuit voltage close to supply voltage
  • Fault may present as steady high voltage or intermittent spikes above expected range

Diagnostic algorithm

  1. Retrieve and record freeze frame and live data for the pressure sensor and related parameters. Note when the fault set (vehicle conditions).
  2. Visually inspect sensor and wiring harness for damage, chafing, corrosion, or disconnected plugs. Repair any obvious damage.
  3. With connector disconnected, measure reference voltage at sensor connector (key on). Verify ground continuity to chassis/ECM ground.
  4. Measure sensor output voltage with connector connected and engine running. Compare to expected idle and under-load values. If output is above normal, proceed.
  5. Back-probe the sensor signal and watch for intermittent spikes with a scan tool or oscilloscope to rule out noise or intermittent open circuits.
  6. Perform continuity/resistance checks between sensor connector and ECM pins to detect short to power, short to ground, or opens.
  7. If wiring and connectors test OK, substitute a known-good sensor or bench-test the suspected sensor (apply reference voltage and measure output vs applied pressure).
  8. Inspect DPF and exhaust for heavy soot loading or blockages. If DPF is severely restricted, address cleaning or replacement and retest sensor readings.
  9. Repair or replace wiring, connector, or sensor as indicated. Clear codes and perform a road test/regeneration cycle while monitoring sensor data to confirm repair.
  10. If fault persists after replacing sensor and verifying wiring, consider ECM input circuit testing or ECM replacement per manufacturer guidance.

Likely causes

  • Damaged or corroded sensor connector or wiring
  • Faulty pressure sensor producing high output voltage
  • Blocked/clogged DPF creating higher than expected differential pressure

Fault status

⚠️ Status
Particulate Filter Pressure Sensor A Circuit High — sensor signal above expected range (possible wiring, connector, sensor, or DPF restriction).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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Code

P2455

ISUZU P — Powertrain

DPD Differential Pressure Sensor Circuit High

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

Causes

  • Open or shorted wiring in the DPF pressure sensor signal, power, or ground circuit
  • Corroded, loose, or damaged connector at the pressure sensor or ECM
  • Faulty particulate filter pressure sensor (internal failure)
  • Blocked, restricted, or severely clogged diesel particulate filter causing excessive pressure
  • Exhaust leaks or cross-contamination affecting sensor readings
  • Faulty ECM or poor ECM input circuitry (rare)

Symptoms

  • Check Engine Light / MIL illuminated
  • Reduced engine performance or limited power (on some vehicles)
  • Frequent DPF regeneration attempts or inability to complete regeneration
  • Poor fuel economy
  • Failed emissions test or visible smoke if filter compromised

What to check

  • Read freeze frame and live data for pressure sensor signal and related parameters (engine speed, load, exhaust temp, DPF differential)
  • Inspect sensor connector and wiring for corrosion, pin damage, loose terminals, or crushed wires
  • Measure sensor supply (reference) voltage and ground at the connector (typically 5 V reference and good ground)
  • Check sensor output voltage with key on & engine running; compare to expected idle and load values
  • Perform continuity and resistance checks from sensor connector to ECM to find opens/shorts
  • Inspect exhaust system and DPF for restrictions, soot buildup, or leaks upstream/downstream of the sensor

Signal parameters

  • Typical pressure sensor reference: 5 V (verify vehicle-specific value)
  • Expected sensor output range: approximately 0.5–4.5 V (vehicle-dependent); P2455 indicates signal above upper threshold
  • Differential pressure typical range: near 0–50 mbar (0–5 kPa) at idle, rising under load; exact values depend on engine and DPF design
  • High signal may be >4.5 V or an open-circuit voltage close to supply voltage
  • Fault may present as steady high voltage or intermittent spikes above expected range

Diagnostic algorithm

  1. Retrieve and record freeze frame and live data for the pressure sensor and related parameters. Note when the fault set (vehicle conditions).
  2. Visually inspect sensor and wiring harness for damage, chafing, corrosion, or disconnected plugs. Repair any obvious damage.
  3. With connector disconnected, measure reference voltage at sensor connector (key on). Verify ground continuity to chassis/ECM ground.
  4. Measure sensor output voltage with connector connected and engine running. Compare to expected idle and under-load values. If output is above normal, proceed.
  5. Back-probe the sensor signal and watch for intermittent spikes with a scan tool or oscilloscope to rule out noise or intermittent open circuits.
  6. Perform continuity/resistance checks between sensor connector and ECM pins to detect short to power, short to ground, or opens.
  7. If wiring and connectors test OK, substitute a known-good sensor or bench-test the suspected sensor (apply reference voltage and measure output vs applied pressure).
  8. Inspect DPF and exhaust for heavy soot loading or blockages. If DPF is severely restricted, address cleaning or replacement and retest sensor readings.
  9. Repair or replace wiring, connector, or sensor as indicated. Clear codes and perform a road test/regeneration cycle while monitoring sensor data to confirm repair.
  10. If fault persists after replacing sensor and verifying wiring, consider ECM input circuit testing or ECM replacement per manufacturer guidance.

Likely causes

  • Damaged or corroded sensor connector or wiring
  • Faulty pressure sensor producing high output voltage
  • Blocked/clogged DPF creating higher than expected differential pressure

Fault status

⚠️ Status
Particulate Filter Pressure Sensor A Circuit High — sensor signal above expected range (possible wiring, connector, sensor, or DPF restriction).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P2456 P2463 P2002
Repair manuals

Manual library for ISUZU

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Browse 229 ISUZU manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

P2455

LAND ROVER P — Powertrain

Diesel particulate filter differential pressure sensor - high circuit

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

Causes

  • Open or shorted wiring in the DPF pressure sensor signal, power, or ground circuit
  • Corroded, loose, or damaged connector at the pressure sensor or ECM
  • Faulty particulate filter pressure sensor (internal failure)
  • Blocked, restricted, or severely clogged diesel particulate filter causing excessive pressure
  • Exhaust leaks or cross-contamination affecting sensor readings
  • Faulty ECM or poor ECM input circuitry (rare)

Symptoms

  • Check Engine Light / MIL illuminated
  • Reduced engine performance or limited power (on some vehicles)
  • Frequent DPF regeneration attempts or inability to complete regeneration
  • Poor fuel economy
  • Failed emissions test or visible smoke if filter compromised

What to check

  • Read freeze frame and live data for pressure sensor signal and related parameters (engine speed, load, exhaust temp, DPF differential)
  • Inspect sensor connector and wiring for corrosion, pin damage, loose terminals, or crushed wires
  • Measure sensor supply (reference) voltage and ground at the connector (typically 5 V reference and good ground)
  • Check sensor output voltage with key on & engine running; compare to expected idle and load values
  • Perform continuity and resistance checks from sensor connector to ECM to find opens/shorts
  • Inspect exhaust system and DPF for restrictions, soot buildup, or leaks upstream/downstream of the sensor

Signal parameters

  • Typical pressure sensor reference: 5 V (verify vehicle-specific value)
  • Expected sensor output range: approximately 0.5–4.5 V (vehicle-dependent); P2455 indicates signal above upper threshold
  • Differential pressure typical range: near 0–50 mbar (0–5 kPa) at idle, rising under load; exact values depend on engine and DPF design
  • High signal may be >4.5 V or an open-circuit voltage close to supply voltage
  • Fault may present as steady high voltage or intermittent spikes above expected range

Diagnostic algorithm

  1. Retrieve and record freeze frame and live data for the pressure sensor and related parameters. Note when the fault set (vehicle conditions).
  2. Visually inspect sensor and wiring harness for damage, chafing, corrosion, or disconnected plugs. Repair any obvious damage.
  3. With connector disconnected, measure reference voltage at sensor connector (key on). Verify ground continuity to chassis/ECM ground.
  4. Measure sensor output voltage with connector connected and engine running. Compare to expected idle and under-load values. If output is above normal, proceed.
  5. Back-probe the sensor signal and watch for intermittent spikes with a scan tool or oscilloscope to rule out noise or intermittent open circuits.
  6. Perform continuity/resistance checks between sensor connector and ECM pins to detect short to power, short to ground, or opens.
  7. If wiring and connectors test OK, substitute a known-good sensor or bench-test the suspected sensor (apply reference voltage and measure output vs applied pressure).
  8. Inspect DPF and exhaust for heavy soot loading or blockages. If DPF is severely restricted, address cleaning or replacement and retest sensor readings.
  9. Repair or replace wiring, connector, or sensor as indicated. Clear codes and perform a road test/regeneration cycle while monitoring sensor data to confirm repair.
  10. If fault persists after replacing sensor and verifying wiring, consider ECM input circuit testing or ECM replacement per manufacturer guidance.

Likely causes

  • Damaged or corroded sensor connector or wiring
  • Faulty pressure sensor producing high output voltage
  • Blocked/clogged DPF creating higher than expected differential pressure

Fault status

⚠️ Status
Particulate Filter Pressure Sensor A Circuit High — sensor signal above expected range (possible wiring, connector, sensor, or DPF restriction).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P2456 P2463 P2002
274

Browse 274 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

P2455

MITSUBISHI P — Powertrain

DPF differential PRS.sensor high

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

Causes

  • Open or shorted wiring in the DPF pressure sensor signal, power, or ground circuit
  • Corroded, loose, or damaged connector at the pressure sensor or ECM
  • Faulty particulate filter pressure sensor (internal failure)
  • Blocked, restricted, or severely clogged diesel particulate filter causing excessive pressure
  • Exhaust leaks or cross-contamination affecting sensor readings
  • Faulty ECM or poor ECM input circuitry (rare)

Symptoms

  • Check Engine Light / MIL illuminated
  • Reduced engine performance or limited power (on some vehicles)
  • Frequent DPF regeneration attempts or inability to complete regeneration
  • Poor fuel economy
  • Failed emissions test or visible smoke if filter compromised

What to check

  • Read freeze frame and live data for pressure sensor signal and related parameters (engine speed, load, exhaust temp, DPF differential)
  • Inspect sensor connector and wiring for corrosion, pin damage, loose terminals, or crushed wires
  • Measure sensor supply (reference) voltage and ground at the connector (typically 5 V reference and good ground)
  • Check sensor output voltage with key on & engine running; compare to expected idle and load values
  • Perform continuity and resistance checks from sensor connector to ECM to find opens/shorts
  • Inspect exhaust system and DPF for restrictions, soot buildup, or leaks upstream/downstream of the sensor

Signal parameters

  • Typical pressure sensor reference: 5 V (verify vehicle-specific value)
  • Expected sensor output range: approximately 0.5–4.5 V (vehicle-dependent); P2455 indicates signal above upper threshold
  • Differential pressure typical range: near 0–50 mbar (0–5 kPa) at idle, rising under load; exact values depend on engine and DPF design
  • High signal may be >4.5 V or an open-circuit voltage close to supply voltage
  • Fault may present as steady high voltage or intermittent spikes above expected range

Diagnostic algorithm

  1. Retrieve and record freeze frame and live data for the pressure sensor and related parameters. Note when the fault set (vehicle conditions).
  2. Visually inspect sensor and wiring harness for damage, chafing, corrosion, or disconnected plugs. Repair any obvious damage.
  3. With connector disconnected, measure reference voltage at sensor connector (key on). Verify ground continuity to chassis/ECM ground.
  4. Measure sensor output voltage with connector connected and engine running. Compare to expected idle and under-load values. If output is above normal, proceed.
  5. Back-probe the sensor signal and watch for intermittent spikes with a scan tool or oscilloscope to rule out noise or intermittent open circuits.
  6. Perform continuity/resistance checks between sensor connector and ECM pins to detect short to power, short to ground, or opens.
  7. If wiring and connectors test OK, substitute a known-good sensor or bench-test the suspected sensor (apply reference voltage and measure output vs applied pressure).
  8. Inspect DPF and exhaust for heavy soot loading or blockages. If DPF is severely restricted, address cleaning or replacement and retest sensor readings.
  9. Repair or replace wiring, connector, or sensor as indicated. Clear codes and perform a road test/regeneration cycle while monitoring sensor data to confirm repair.
  10. If fault persists after replacing sensor and verifying wiring, consider ECM input circuit testing or ECM replacement per manufacturer guidance.

Likely causes

  • Damaged or corroded sensor connector or wiring
  • Faulty pressure sensor producing high output voltage
  • Blocked/clogged DPF creating higher than expected differential pressure

Fault status

⚠️ Status
Particulate Filter Pressure Sensor A Circuit High — sensor signal above expected range (possible wiring, connector, sensor, or DPF restriction).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P2456 P2463 P2002
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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