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Home / DTC / P2454 — Diesel particulate filter differential pressure sensor - low circuit

P2454 — Diesel particulate filter differential pressure sensor - low circuit

Detailed page for trouble code P2454.

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P2454

LAND ROVER P — Powertrain

Diesel particulate filter differential pressure sensor - low circuit

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

Causes

  • Faulty DPF differential pressure sensor (internal failure)
  • Open/poor/grounded signal wiring or connector (corrosion, broken wire, pin pushed out)
  • Short to ground on the sensor signal circuit
  • Blown fuse or poor power/ground to sensor reference
  • Blocked, collapsed or disconnected measurement hose(s) to the sensor
  • ECM input fault (rare)

Symptoms

  • Malfunction Indicator Lamp (MIL)/check engine light illuminated
  • DPF / emissions warning message on dash
  • Reduced engine power or entry to limp mode (in some vehicles)
  • Frequent or failed DPF regenerations
  • Poor fuel economy or increased soot emissions
  • Stored freeze-frame/live-data showing very low/zero differential pressure reading

What to check

  • Read freeze-frame and freeze/live data: note sensor voltage/pressure reading with key on and during idle/load
  • Confirm related pending/fault history and whether code is current or intermittent
  • Visually inspect sensor, connectors and wiring for damage, corrosion, water ingress or heat damage
  • Inspect and gently pull on wiring harness for intermittent faults
  • Check measurement hose(s) for blockages, kinks, collapsing, disconnection, or leaks
  • Backprobe sensor connector: verify reference power (usually 5 V or vehicle-specific), ground and signal with key ON and engine running

Signal parameters

  • Typical sensor type: electrical pressure transducer with reference voltage (commonly 5 V) and a signal voltage output
  • Expected signal voltage range (manufacturer dependent): commonly ~0.5–4.5 V for working sensor; low-circuit indication when signal is near 0–0.2 V or below manufacturer low threshold
  • Expected pressure readings: near-zero differential pressure with engine off or DPF removed; small positive value at idle and higher under load — implausibly low or zero under load indicates fault
  • Check that reference voltage to sensor is present (often ~5 V) and sensor ground is solid

Diagnostic algorithm

  1. Retrieve codes and live data using a capable scan tool; note freeze-frame conditions (engine speed, load, temperature).
  2. Visually inspect sensor, hoses and connector for obvious damage or disconnection; repair as needed.
  3. With key ON (engine OFF), backprobe connector: verify reference voltage and ground. If no reference power or ground, trace and repair supply/ground circuit (fuse, relay, ECU pin).
  4. With engine running, observe live differential pressure and signal voltage while creating load changes (idle to higher rpm). Low/zero signal under load supports low-circuit fault.
  5. Check measurement hoses: disconnect at sensor to confirm hoses are not blocked/collapsed and that tubing routing is correct. Replace cracked or collapsed hoses.
  6. Perform continuity check from sensor connector pins to ECU connector to rule out open or short. Repair wiring harness faults.
  7. If wiring and power/ground are good, replace the differential pressure sensor with OEM or approved part and verify correct operation.
  8. Clear codes, perform road test and re-scan. If the code returns, consider ECU input fault or DPF hardware issues and consult manufacturer technical service information.
  9. Safety: allow exhaust system to cool before probing hoses or components; secure vehicle when working under it.

Likely causes

  • Damaged or disconnected pressure sensor vacuum/measurement hose(s)
  • Corroded/loose connector or broken signal wire to sensor
  • Failed pressure sensor element
  • Sensor reference power or ground fault

Fault status

⚠️ Status
MIL on — ECM detected low/invalid signal from DPF differential pressure sensor circuit. Possible open/short, sensor failure or hose/wiring issue. Inspect sensor, hoses, wiring and connector.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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